Sabah Menaa, Fethi Achi

Electrocatalysis • 2022

Stephanie Stoll, Jae-Hoon Hwang, David W. Fox et al.

Environmental Science and Pollution Research • 2022

Laura Sakalauskiene, Anton Popov, Asta Kausaite‐Minkstimiene et al.

Biosensors • 2022

In recent years, many efforts have been made to develop rapid, sensitive and user-friendly glucose biosensors for monitoring blood glucose concentration in patients. In this study, the electrochemical glucose biosensors based on graphite rod (GR) electrode electrochemically modified with dendritic gold nanostructures (DGNs) and glucose oxidase (GOx) were developed. Phenazine methosulfate was used as a soluble redox mediator. Three GOx immobilization methods: adsorption on DGNs and cross-linking with glutaraldehyde (GA) vapour (GA-GOx/DGNs/GR), covalent immobilization on DGNs modified with 11-mercaptoundecanoic acid self-assembled monolayer (SAM) (GOx-SAM/DGNs/GR) and covalent immobilization on SAM with additional cross-linking with GA vapour (GA-GOx-SAM/DGNs/GR), were used. It was determined that GA significantly improved the stability of the enzyme layer. The difference of maximal current generated during the enzymatic reaction (Δ I max ) equal to 272.06 ± 8.69 µA was obtained using a biosensor based on GA-GOx/DGNs/GR electrodes. However, the highest Δ I max equal to 384.20 ± 16.06 µA was obtained using GA-GOx-SAM/DGNs/GR electrode. Δ I max for biosensors based on the GA-GOx-SAM/DGNs/GR electrode was 1.41 times higher than for the GA-GOx/DGNs/GR, whereas the linear dynamic range from 0.1 to 10 mM was the same using all three GOx immobilization methods. The limit of detection using GA-GOx-SAM/DGNs/GR and GA-GOx/DGNs/GR electrodes was 0.019 and 0.022 mM, respectively. The ability to detect glucose in the serum by developed biosensors was evaluated.

Yijun Fu, Jiamu Dai, Yan Ge et al.

Molecules • 2018

A co-based porous metal-organic framework (MOF) of zeolitic imidazolate framework-67 (ZIF-67) and carbon nanofibers (CNFs) was utilized to prepare a ZIF-67/CNFs composite via a one-pot synthesis method. Scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), and X-ray diffraction (XRD) were employed to investigate the morphology, structure, and composition of the resulting composite. A novel high-performance non-enzymatic electrochemical sensor was constructed based on the ZIF-67/CNFs composite. The ZIF-67/CNFs based sensor exhibited enhanced electrocatalytic activity towards H₂O₂ compared to a pure ZIF-67-based sensor, due to the synergistic effects of ZIF-67 and CNFs. Meanwhile, chronoamperometry was utilized to explore the detection performance of the sensor. Results showed the sensor displayed high-efficiency electrocatalysis towards H₂O₂ with a detection limit of 0.62 μM (S/N = 3), a sensitivity of 323 µA mM -1 cm -2 , a linear range from 0.0025 to 0.19 mM, as well as satisfactory selectivity and long-term stability. Furthermore, the sensor demonstrated its application potential in the detection of H₂O₂ in food.

Ehsan Nazarzadeh Zare‬, Tarun Agarwal, Atefeh Zarepour et al.

Applied Materials Today • 2021

Amir Hosein Ali Naghian, Zahra Hashemi, Fereshteh Chekin et al.

Nanoscale Advances • 2024

Ribavirin (RIB) is widely used for the treatment of viral diseases such as herpes, hepatitis C, and Lassa fever. Moreover, to control the spread of COVID-19, the consumption of antiviral medicines, including RIB, has increased significantly worldwide. By combining ordered mesoporous carbon with silica nanoparticles via ultrasound, we synthesized silica/ordered mesoporous carbon (SiO 2 -OMC) hybrid composites that show excellent electrochemical performance. The hybrid composite was found to contain spherical SiO 2 nanoparticles having diameters ranging from 21 to 29 nm. A sensor comprising a carbon paste electrode and SiO 2 -OMC (SiO 2 -OMC/CPE) facilitated the ultrasensitive and selective detection of RIB at an oxidation potential of 0.71 V, having a linear range of 0.1-40 μmol L -1 , limit of detection of 0.067 μmol L -1 , and sensitivity of 1.969 μA μmol -1 L. Furthermore, the results indicate that charge transfer at the interface of the SiO 2 -OMC hybrid results in a synergistic effect compared to OMC and SiO 2 alone. The advantages include the potential for regenerating the sensor surface, rapid and facile production, and suitability for the detection of RIB in capsule, human plasma, and urine samples, making SiO 2 -OMC/CPE a promising interface for bioelectrochemical applications.

Sarra Karoui, Rim Ben Arfi, Karine Mougin et al.

Journal of Hazardous Materials • 2019

Sudarma Dita Wijayanti, Franziska Schachinger, Roland Ludwig et al.

Bioelectrochemistry • 2023

We investigated the bioelectrochemical properties of an FAD-dependent glucose dehydrogenase from Trichoderma virens (TvGDH) and its electrochemical behaviour when immobilized on a graphite electrode. TvGDH was recently shown to have an unusual substrate spectrum and to prefer maltose over glucose as substrate, and hence could be of interest as recognition element in a maltose sensor. In this study, we determined the redox potential of TvGDH, which is -0.268 ± 0.007 V vs. SHE, and advantageously low to be used with many redox mediators or redox polymers. The enzyme was entrapped in, and wired by an osmium redox polymer (poly(1-vinylimidazole-co-allylamine)-{[Os(2,2'-bipyridine) 2 Cl]Cl}) with formal redox potential of +0.275 V vs. Ag|AgCl via poly(ethylene glycol) diglycidyl ether crosslinking onto a graphite electrode. When the TvGDH-based biosensor was tested with maltose it showed a sensitivity of 1.7 μA mM -1 cm -2 , a linear range of 0.5-15 mM, and a detection limit of 0.45 mM. Furthermore, it gave the lowest apparent Michaelis-Menten constant (K M app ) of 19.2 ± 1.5 mM towards maltose when compared to other sugars. The biosensor is also able to detect other saccharides including glucose, maltotriose and galactose, these however also interfere with maltose sensing.

Anton Popov, Benediktas Brasiūnas, Anzelika Damaskaite et al.

Polymers • 2020

Conjugated polymers (CPs) are attractive materials for use in different areas; nevertheless, the enhancement of electrochromic stability and switching time is still necessary to expand the commercialization of electrochromic devices. To our best knowledge, this is the first study demonstrating the employment of electrodeposited gold nanostructures (AuNS) for the enhancement of CPs' electrochromic properties when a transparent electrode is used as a substrate. Polyaniline-poly(3,4-ethylenedioxythiophene) (PANI-PEDOT) films were electrodeposited on a transparent indium tin oxide glass electrode, which was pre-modified by two different methods. AuNS were electrodeposited at -0.2 V constant potential for 60 s using both the 1st method (synthesis solution consisted of 3 mM HAuCl 4 and 0.1 M H 2 SO 4 ) and 2nd method (15 mM HAuCl 4 and 1 M KNO 3 ) resulting in an improvement of optical contrast by 3% and 22%, respectively. Additionally, when using the 1st method, the coloration efficiency was improved by 50% while the switching time was reduced by 17%. Furthermore, in both cases, the employment of AuNS resulted in an enhancement of the electrochromic stability of the CPs layer. A further selection of AuNS pre-modification conditions with the aim to control their morphology and size can be a possible stepping stone for the further improvement of CPs electrochromic properties.

Ehtisham Wahid, Ohiemi Benjamin Ocheja, Sunday Olakunle Oguntomi et al.

Scientific Reports • 2025

Electrodes functionalised with weak electroactive microorganisms offer a viable alternative to conventional chemical sensors for detecting priority pollutants in bioremediation processes. Biofilm-based biosensors have been proposed for this purpose. However, biofilm formation and maturation require 24-48 h, and the microstructure and coverage of the electrode surface cannot be controlled, leading to poorly reproducible signal and sensitivity. Alternatively, semiconductive biocompatible coatings can be used for viable cell immobilization, achieving reproducible coverage and resulting in a stable biosensor response. In this work, we use a polydopamine (PDA)-based coating to immobilize Saccharomyces cerevisiae yeast viable cells on carbon screen printed electrodes (SPE) for Cu(II) detection, with potassium ferricyanide (K 3 [Fe (CN) 6 ]) as a redox mediator. Under these conditions, the current output correlates with Cu (II) concentration, reaching a limit of detection of 2.2 µM, as calculated from the chronoamperometric response. The bioelectrochemical results are supported by standard viability assays, microscopy, and electrochemical impedance spectroscopy. The PDA coatings can be functionalised with different mutant strains, thus expanding the toolbox for biosensor design in bioremediation.

Aswathi Mechoor, V. Ganesh, Sheela Berchmans

ChemElectroChem • 2022

Abstract Bioelectricity or bioelectrochemical energy conversion, which is not subjected to Carnot's limitation, is a greener alternative to renewable energy sources. However, the sluggishness of electron transfer between enzyme/microorganisms and the electrodes and low efficiency of electron capture at the electrodes limit the power densities to lower levels. Development of rugged low power density devices with prolonged life is suitable for applications such as powering implantable devices, fabrication of self‐powered sensors, powering remote sensors, wastewater treatment and bioelectrosynthesis. Metal organic frameworks (MOFs) are versatile materials with high surface area that can act as exoskeletons for enzymes/microorganisms to stabilize and protect them from denaturation with retention of their activity for a prolonged period, thereby enabling robustness to the biocatalyst. Further MOFs and MOF‐derived carbonaceous materials are shown to perform better than Pt/C catalysts for the oxygen reduction reaction (ORR), the often used cathodic reaction in a biofuel cell. The role of MOFs in the area of bioelectrochemical energy conversion, especially with respect to applications in biofuel cells and self‐powered sensors, is discussed in detail in this Review.

Hisanori Iwasa, Kazumichi Ozawa, Noriko Sasaki et al.

Biochemical Engineering Journal • 2018

Bernardo Patella, Alessia Sortino, Francesca Mazzara et al.

Analytica Chimica Acta • 2021

Andrea Castillo-Atoche, Norberto A. Colín García, Johan J. Estrada-López et al.

Journal of Power Sources • 2023

Andreas Netsch, Inka Latussek, Harald Horn et al.

Biotechnology and Bioengineering • 2025

Long-term stable operation of bioelectrochemical systems (BES) presupposes the avoidance of mass transfer limitations of the electroactive biofilm. Excessive pH-gradients from bulk to electrode interface or substrate limitations of the electroactive biofilm are known to diminish the electrical performance of BES. In this study the impact of the morphology of a mixed-species electroactive biofilm cultivated on the electrical performance of a microbial electrolysis cell (MEC) was investigated to identify the optimal biofilm for real-life applications in wastewater treatment. Noninvasive monitoring by means of optical coherence tomography and an industrial biofilm sensor allowed for a real-time evaluation of the morphology of the biofilm. The maximum current density of approximately 3.5 A/m² was found for a mean biofilm thickness in the range of 100-150 µm, beyond which thicker biofilms caused mass transfer limitations. Along with local biofilm detachment a continuous decline in efficiency demonstrates the need for active biofilm control to adjust the biofilm thickness.

Huihui Zhou, Xianwen Xuanyuan, Xiaowei Lv et al.

The Science of The Total Environment • 2023

Jana Schlaugat, Kai Patzer, Thorleif Hentrop et al.

Engineering in Life Sciences • 2020

The growth of microorganisms on surfaces and interfaces as a biofilm is very common and plays important role in various areas such as material science, biomedicine, or waste treatment among others. Due to their inhomogeneous structure and the variance in the microorganism consortium, the analysis of biofilms represents a significant challenge. An online fluorescence sensor was developed that is able to measure the most important biological fluorophores (proteins, nicotinamide adenine dinucleotide, and flavin) in a noninvasive manner in biofilms, e.g. in bioelectrochemical applications. The sensor gives the opportunity to continuously draw conclusions on the metabolic state of the biofilm. The developed sensor has a diameter of 1 mm at the sensor tip and can be moved on and into the biofilm surface. In the first experiment, the measuring range of the sensor and the long-term stability could be determined and the system applicability was confirmed. In addition, measurements in biofilm-like structures could be performed. The formation of a wastewater-based biofilm was monitored using the developed sensor, demonstrating the functionality of the sensor in a proof-of-principle experiment.

Huijuan Su, Xuejun Yan, Qian Zhao et al.

ACS Sensors • 2023

Microbial electrochemical sensors are promising to monitor bioavailable organics in real environments, but their application is restricted by the unpredictable performance of the electroactive biofilm (EAB), which is randomly acclimated from environmental microflora. With a long-term stable EAB as a template, we successfully designed EAB (DEAB) by the sequential growth of Geobacter anodireducens and automatched microbes, achieving a reproducible high current than those naturally acclimated from wastewater (NEAB). Pre-inoculation of planktonic aerobes as oxygen bioscavengers was necessary to ensure the colonization of Geobacter in the inner layer, and the abundant Geobacter (50%) in DEAB guaranteed 4 times higher current density with a 15-fold smaller variation among 20 replicates than those of NEAB. The sensor constructed with DEAB exhibited a shorter measuring time and a precise biochemical oxygen demand (BOD) measurement with acetate, real domestic wastewater, and supernatant of anaerobic digestion. Here, we for the first time proposed an applicable strategy to standardize EABs for BOD sensors, which is also crucial to ensure a stable performance of all bioelectrochemical technologies.

Hyeryeong Lee, Yoo Seok Lee, Stacy Simai Reginald et al.

Biosensors and Bioelectronics • 2020

Yulia Plekhanova, Sergei Tarasov, В. В. Колесов et al.

Membranes • 2018

The anode of a microbial fuel cell (MFC) was formed on a graphite electrode and immobilized Gluconobacter oxydans VKM-1280 bacterial cells. Immobilization was performed in chitosan, poly(vinyl alcohol) or N -vinylpyrrolidone-modified poly(vinyl alcohol). Ethanol was used as substrate. The anode was modified using multiwalled carbon nanotubes. The aim of the modification was to create a conductive network between cell lipid membranes, containing exposed pyrroloquinoline quinone (PQQ)-dependent alcoholdehydrogenases, and the electrode to facilitate electron transfer in the system. The bioelectrochemical characteristics of modified anodes at various cell/polymer ratios were assessed via current density, power density, polarization curves and impedance spectres. Microbial fuel cells based on chitosan at a matrix/cell volume ratio of 5:1 produced maximal power characteristics of the system (8.3 μW/cm²) at a minimal resistance (1111 Ohm cm²). Modification of the anode by multiwalled carbon nanotubes (MWCNT) led to a slight decrease of internal resistance (down to 1078 Ohm cm²) and to an increase of generated power density up to 10.6 μW/cm². We explored the possibility of accumulating electric energy from an MFC on a 6800-μF capacitor via a boost converter. Generated voltage was increased from 0.3 V up to 3.2 V. Accumulated energy was used to power a Clark-type biosensor and a Bluetooth transmitter with three sensors, a miniature electric motor and a light-emitting diode.

Xiaoke Yang, Fuli Zhang, Wentao Wu et al.

Angewandte Chemie International Edition • 2021

Quantitative measurements of intravesicular glutamate (Glu) and of transient exocytotic release contents directly from individual living neurons are highly desired for understanding the mechanisms (full or sub-quantal release?) of synaptic transmission and plasticity. However, this could not be achieved so far due to the lack of adequate experimental strategies relying on selective and sensitive Glu nanosensors. Herein, we introduce a novel electrochemical Glu nanobiosensor based on a single SiC nanowire that can selectively measure in real-time Glu fluxes released via exocytosis by large Glu vesicles (ca. 125 nm diameter) present in single hippocampal axonal varicosities as well as their intravesicular content before exocytosis. These measurements revealed a sub-quantal release mode in living hippocampal neurons, viz., only ca. one third to one half of intravesicular Glu molecules are released by individual vesicles during exocytotic events. Importantly, this fraction remained practically the same when hippocampal neurons were pretreated with L-Glu-precursor L-glutamine, while it significantly increased after zinc treatment, although in both cases the intravesicular contents were drastically affected.

Sebastian Roubert Martinez, Paul Le Floch, Jia Liu et al.

Advanced Healthcare Materials • 2023

Cutaneous electrodes are routinely used for noninvasive electrophysiological sensing of signals from the brain, the heart, and the neuromuscular system. These bioelectronic signals propagate as ionic charge from their sources to the skin-electrode interface where they are then sensed as electronic charge by the instrumentation. However, these signals suffer from low signal-to-noise ratio arising from the high impedance at the tissue-to-electrode contact interface. This paper reports that soft conductive polymer hydrogels made purely of poly(3,4-ethylenedioxy-thiophene) doped with poly(styrene sulfonate) present nearly an order of magnitude decrease in the skin-electrode contact impedance (88%, 82%, and 77% at 10, 100, and 1 kHz, respectively) when compared to clinical electrodes in an ex vivo model that isolates the bioelectrochemical features of a single skin-electrode contact. Integrating these pure soft conductive polymer blocks into an adhesive wearable sensor enables high fidelity bioelectronic signals with higher signal-to-noise ratio (average 2.1 dB increase, max 3.4 dB increase) when compared to clinical electrodes across all subjects. The utility of these electrodes is demonstrated in a neural interface application. The conductive polymer hydrogels enable electromyogram-based velocity control of a robotic arm to complete a pick and place task. This work provides a basis for the characterization and use of conductive polymer hydrogels to better couple human and machine.

Lin Liu, Seokheun Choi

ACS Applied Energy Materials • 2020

A high-performance supercapacitive anode integrated into cyanobacterial biophotovoltaics allows the energy produced by the biophotovoltaics to be capacitively stored and delivered through a significant high-power burst. A ternary nanocomposite of poly(3,4-ethylenedioxythiophene) polystyrene sulfonate, manganese dioxide (MnO2), and carbon nanotubes was designed to provide unique and critical functions for the development of a fully light-driven biosupercapacitor or a supercapacitive biophotovoltaic device. The nanocomposite on a carbon cloth exhibited a high specific capacitance of 261 F/g in 1 M sodium sulfate (Na2SO4). Even with a thick biofilm of Synechocystis sp. PCC6803 in a BG-11 cyanobacterial growth medium having a low-ionic conductivity, the nanocomposite-covered cloth showed great bioelectrochemical activity under illumination, producing an areal capacitance of 105.2 mF·cm–2 and an energy of 13.2 μW h·cm–2. This nanocomposite integrated in a cyanobacterial biophotovoltaic device serves as a double-function bioanode concurrently exhibiting light-driven bioelectrocatalytic and charge-storage features. It offers the great energy-harvesting capability of biophotovoltaics and the deep power reservoir of an internal supercapacitor through charging and discharging operations. Our hybrid system produced a maximum power density of 162 μW·cm–2 for a 0.1 s pulse at a discharging current density of 300 μA·cm–2, which is about 100 times larger than that of the biophotovoltaic device on an unmodified carbon cloth and about 6 times greater than that of our biophotovoltaic device without the charging–discharging operation. The developed supercapacitive biophotovoltaics represent a revolutionary technological breakthrough that offers a potentially viable long-term and powerful energy source for unattended wireless sensor networks.

Amruta Karbelkar, Rachel Ahlmark, Xingcheng Zhou et al.

Bioconjugate Chemistry • 2023

Modification of electrodes with biomolecules is an essential first step for the development of bioelectrochemical systems, which are used in a variety of applications ranging from sensors to fuel cells. Gold is often used because of its ease of modification with thiolated biomolecules, but carbon screen-printed electrodes (SPEs) are gaining popularity due to their low cost and fabrication from abundant resources. However, their effective modification with biomolecules remains a challenge; the majority of work to-date relies on nonspecific adhesion or broad amide bond formation to chemical handles on the electrode surface. By combining facile electrochemical modification to add an aniline handle to electrodes with a specific and biocompatible oxidative coupling reaction, we can readily modify carbon electrodes with a variety of biomolecules. Importantly, both proteins and DNA maintain bioactive conformations following coupling. We have then used biomolecule-modified electrodes to generate microbial monolayers through DNA-directed immobilization. This work provides an easy, general strategy to modify inexpensive carbon electrodes, significantly expanding their potential as bioelectrochemical systems.

Qian Zhang, J. Shang, Haidi Qiao et al.

Composites Communications • 2025

Juan He, Han Yang, Yayun Zhang et al.

Scientific Reports • 2016

Herein, a smart porous material, Cu-hemin metal-organic-frameworks (Cu-hemin MOFs), was synthesized via assembling of Cu 2+ with hemin to load glucose oxidase (GOD) for electrochemical glucose biosensing for the first time. The formation of the Cu-hemin MOFs was verified by scanning electron microscopy, X-ray powder diffraction, Fourier transform infrared spectroscopy, N 2 adsorption/desorption isotherms, UV-vis absorption spectroscopy, fluorescence spectroscopy, thermal analysis and electrochemical techniques. The results indicated that the Cu-hemin MOFs showed a ball-flower-like hollow cage structure with a large specific surface area and a large number of mesopores. A large number of GOD molecules could be successfully loaded in the pores of Cu-hemin MOFs to keep their bioactivity just like in a solution. The GOD/Cu-hemin MOFs exhibited both good performance toward oxygen reduction reaction via Cu-hemin MOFs and catalytic oxidation of glucose via GOD, superior to other GOD/MOFs and GOD/nanomaterials. Accordingly, the performance of GOD/Cu-hemin MOFs-based electrochemical glucose sensor was enhanced greatly, showing a wide linear range from 9.10 μM to 36.0 mM and a low detection limit of 2.73 μM. Moreover, the sensor showed satisfactory results in detection of glucose in human serum. This work provides a practical design of new electrochemical sensing platform based on MOFs and biomolecules.

Ke Zhang, Huiling Cao, Jia Chen et al.

International Journal of Hydrogen Energy • 2022

Xiang Qi, Panpan Liu, Peng Liang et al.

Biosensors and Bioelectronics • 2019

Paloma Yáñez‐Sedeño, A. González, L. Agüı́ et al.

Electroanalysis • 2016

Abstract Electrochemical devices making use of carbon nanomaterials have demonstrated great applicability. Single‐ or multi‐walled nanotubes and graphene have been largely applied to the construction of electrochemical (bio)sensors improving two key aspects in this field: surface nanostructuration allowing the preparation of electrode platforms more conductive, selective and suitable for biomolecules immobilization, and the ability to design suitable strategies for signal amplification. Besides the above mentioned carbon nanomaterials, more recently new carbon nanoforms have appeared as suitable nanostructuration tools. Carbon nanohorns, double‐walled carbon nanotubes, fullerene (C60), carbon nanoparticles, and graphene quantum dots are examples of novel nanomaterials whose particular characteristics make them well suited for the construction of bioelectrochemical devices. In this article, the use of these carbon nanomaterials for the development of electrochemical immunosensors is reviewed.

Andreas Netsch, Harald Horn, Michael Wagner

Biosensors • 2021

Biofilms growing on electrodes are the heart piece of bioelectrochemical systems (BES). Moreover, the biofilm morphology is key for the efficient performance of BES and must be monitored and controlled for a stable operation. For the industrial use of BES (i.e., microbial fuel cells for energy production), monitoring of the biofilm accumulation directly on the electrodes during operation is desirable. In this study a commercially available on-line heat transfer biofilm sensor is applied to a graphite-polypropylene (C-PP) pipe and compared to its standard version where the sensor is applied to a stainless-steel pipe. The aim was to investigate the transferability of the sensor to a carbonaceous material (C-PP), that are preferably used as electrode materials for bioelectrochemical systems, thereby enabling biofilm monitoring directly on the electrode surface. The sensor signal was correlated to the gravimetrically determined biofilm thickness in order to identify the sensitivity of the sensor for the detection and quantification of biofilm on both materials. Results confirmed the transferability of the sensor to the C-PP material, despite the sensor sensitivity being decreased by a factor of approx. 5 compared to the default biofilm sensor applied to a stainless-steel pipe.

R Maallah, Abdelaziz Moutcine, Charaf Laghlimi et al.

Sensing and Bio-Sensing Research • 2019

Bioelectrochemical systems based on bacteria thin film modified electrode were explored. The prepared bacteria modified aluminum electrode was characterized with voltametric methods, as cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and Electrochemical polarization curves.The proposed electrode indicated a definite redox response, high conductivity and electrochemical stability. The experimental results revealed that the prepared electrode could be a feasible for degradation of hazardous phenol pollutants. The sensor was successfully applied to the determination of phenol in a real sample with satisfactory results. Keywords: Bacteria, Modified electrode, SWV, EIS, Electrochemical polarization curves, Phenol

Jehan El Nady, Azza Shokry, Marwa Khalil et al.

Scientific Reports • 2022

An electrochemical deposition technique was used to fabricate polypyrrole (Ppy)/NiO nanocomposite electrodes for supercapacitors. The nanocomposite electrodes were characterized and investigated by Fourier transform infrared spectroscopy (FTIR), X-ray Diffraction (XRD), scanning electron microscopy (SEM), cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS). The performance of supercapacitor electrodes of Ppy/NiO nanocomposite was enhanced compared with pristine Ppy electrode. It was found that the Ppy/NiO electrode electrodeposited at 4 A/cm -2 demonstrated the highest specific capacitance of 679 Fg -1 at 1 Ag -1 with an energy density of 94.4 Wh kg -1 and power density of 500.74 W kg -1 . Capacitance retention of 83.9% of its initial capacitance after 1000 cycles at 1 Ag -1 was obtained. The high electrochemical performance of Ppy/NiO was due to the synergistic effect of NiO and Ppy, where a rich pores network-like structure made the electrolyte ions more easily accessible for Faradic reactions. This work provided a simple approach for preparing organic-inorganic composite materials as high-performance electrode materials for electrochemical supercapacitors.

Shaneel Chandra, Shajahan Siraj, Danny K.Y. Wong

ChemElectroChem • 2017

Abstract This Minireview focuses on recent advances in the applications of microelectrodes to detect and monitor targeted analytes in bioelectrochemical processes. Notably, these processes are electrochemically driven reactions that involve the detection of targets from the biological realm. Wide‐ranging applications of electrochemical sensors have been reported in the last few decades in various research fields, owing to favorable attributes such as high selectivity and sensitivity, rapid analysis, simplicity, easy fabrication, and cost effectiveness. Accordingly, in this Minireview, we explore recent advances in bioelectrochemistry based on small detection probes or structures modified for a variety of analytes, exploiting multi‐approach advantages of enhanced electrochemical detection surface or targeted analyte pursuit. The target analytes included in this Minireview are neurotransmitters and disease biomarkers detected using enzymatic and non‐enzymatic electrode modifications.

Muhammad Farhan Hil Me, Wei Lun Ang, Ahmad Razi Othman et al.

Environmental Monitoring and Assessment • 2024

Yue Yi, Beizhen Xie, Ting Zhao et al.

Bioelectrochemistry • 2019

Domenico Frattini, Kyuhuan Hyun, Yongchai Kwon

Journal of Industrial and Engineering Chemistry • 2019

Hariteja Nandimandalam, Veera Gnaneswar Gude

Marine Pollution Bulletin • 2019

Qing Du, Tian Li, Nan Li et al.

Environmental Science & Technology Letters • 2017

Electroactive biofilm has a low tolerance for accidental shocks, such as extreme acid shock, which is a potential limitation for the application of bioelectrochemical systems (BESs), especially as a sensor for water quality monitoring. In this work, we encapsulated electroactive biofilms with biocompatible polydopamine (PDA) to protect against extreme acid shock. The bacterial cells were completely encapsulated in ∼50 nm films formed by PDA spheres, which protected their viability and current recoverability even after pH 0.5 and 1.5 shocks. The limiting current density of the PDA-encapsulated anode was 0.20 ± 0.05 A/m2, which was 1900% higher than that of the unprotected control (0.01 ± 0.01 A/m2) after strong acid shock (pH 0.5, 30 min). Without PDA encapsulation, the biofilm partly disintegrated with a thickness decreased by 68% from 72 to 23 μm, where 92% of the cells were dead. Our findings reported a novel and effective method for protecting electroactive biofilm under extreme conditions, which will greatly extend the use of BESs in the future.

Sebastià Puig, Ramon Ganigué, Pau Batlle‐Vilanova et al.

Bioresource Technology • 2016

Tunç Çatal, Burak Kilinc, Aksana Kavaleuskaya et al.

Bioelectrochemistry • 2025