Jia-Yi Fang, Qizheng Zheng, Yao‐Yin Lou et al.

Nature Communications • 2022

The development of electrocatalysts capable of efficient reduction of nitrate (NO 3 - ) to ammonia (NH 3 ) is drawing increasing interest for the sake of low carbon emission and environmental protection. Herein, we present a CuCo bimetallic catalyst able to imitate the bifunctional nature of copper-type nitrite reductase, which could easily remove NO 2 - via the collaboration of two active centers. Indeed, Co acts as an electron/proton donating center, while Cu facilitates NO x - adsorption/association. The bio-inspired CuCo nanosheet electrocatalyst delivers a 100 ± 1% Faradaic efficiency at an ampere-level current density of 1035 mA cm -2 at -0.2 V vs. Reversible Hydrogen Electrode. The NH 3 production rate reaches a high activity of 4.8 mmol cm -2 h -1 (960 mmol g cat -1 h -1 ). A mechanistic study, using electrochemical in situ Fourier transform infrared spectroscopy and shell-isolated nanoparticle enhanced Raman spectroscopy, reveals a strong synergy between Cu and Co, with Co sites promoting the hydrogenation of NO 3 - to NH 3 via adsorbed *H species. The well-modulated coverage of adsorbed *H and *NO 3 led simultaneously to high NH 3 selectivity and yield.

Ahmed Barhoum, Kaushik Pal, Hubert Rahier et al.

Applied Materials Today • 2019

Sandra Edith Benito-Santiago, Brigitte Vigolo, Jaafar Ghanbaja et al.

Ceramics • 2025

Nickel-doped iron oxide/graphene oxide powders were synthesized by the co-precipitation method varying the Ni/Fe ratio, and the activity of the materials towards the oxygen reduction reaction in a microbial fuel cell (MFC) was studied. The samples presented X-ray diffraction peaks associated with magnetite, maghemite and Ni ferrite, as well as evidence of hematite. Raman spectra confirmed the presence of maghemite (γ-Fe2O3) and NiFe2O4. Scanning electron micrographs showed exfoliated sheets decorated with nanoparticles, and transmission electron micrographs showed spherical nanoparticles about 10 nm in diameter well distributed on the individual graphene sheet. The electrocatalytic activity for the oxygen reduction reaction (ORR) was studied by cyclic voltammetry in an air-saturated electrolyte, finding that the best catalyst was the sample with a 1:2 Ni/Fe ratio, using a catalyst concentration of 15 mg·cm−2 on graphite felt. The 1:2 Ni/Fe catalyst provided an oxygen reduction potential of 397 mV and a maximum oxygen reduction current of −0.13 mA; for comparison, an electrode prepared with GO/γ-Fe2O3 showed a maximum ORR of 369 mV and a maximum current of −0.03 mA. Microbial fuel cells with a vertical proton membrane were prepared with Ni-doped Fe3O4 and Fe3O4/graphene oxide and tested for 24 h; they reached a stable OCV of +400 mV and +300 mV OCV, and an efficiency of 508 mW·m−2 and 139 mW·m−2, respectively. The better performance of Ni-doped material was attributed to the combined presence of catalytic activity between γ-Fe2O3 and NiFe2O4, coupled with lower wettability, which led to better dispersion onto the electrode.

In Ho Park, Pil Kim, G. Gnana kumar et al.

Applied Biochemistry and Biotechnology • 2016

Orr Schlesinger, Lital Alfonta

Methods in enzymology on CD-ROM/Methods in enzymology • 2018

Weihuang Zhu, Haoxiang Gao, Peng Li et al.

Journal of Chemical Technology & Biotechnology • 2020

Abstract BACKGROUND The extracellular electron transfer (EET) between microbes and electrodes modified by graphene‐based functional material has attracted increasing attention. EET is an important process through which the anode can act as the acceptor for the electrons produced via microbial respiration, and it also plays a key role in organic matter degradation and nutrient cycling in the environment. RESULTS Our results showed that the interaction between microbes and carbon felt ( CF ) electrodes decorated with bio‐reduced graphene oxide (GO‐br) was significantly enhanced compared to that between the unmodified CF electrode and microbes. The promoted biological current production and cyclic voltammetric (CV) current response indicated the considerable electro‐activity of the GO‐br‐ CF electrode. diffusion resistance (R dif ) of the GO‐br‐ CF electrode decreased significantly by 97.3% from 2.76 × 10 5 ± 7644 Ω at the initial incubation stage to 7341 ± 1322 Ω after 58 h of incubation time for GO‐br decoration. We also noticed that the GO‐br‐ CF electrode intermittently poised at +0.1 V ( vs Ag/AgCl/KCl sat.) was favorable for EET. The GO‐br‐ CF electrode, which enhanced MFC performance significantly, was further used as the anode in a microbial fuel cell (MFC). CONCLUSION Overall, the results of this study indicated the decoration of CF electrode with GO‐br could regulate the electrochemical activity of the electrode and the EET process between the microbes and electrode. The elevated electrochemical activity and EET were attributed to the rapid decrease in the diffusion resistance (R dif ) of the GO‐br‐ CF electrode.

Junfeng Chen, Jiaqi Yang, Xuemei Wang et al.

International Journal of Hydrogen Energy • 2022

Yanhui Liu, Ke Xu, Xiaochen Zhang et al.

Current Applied Physics • 2016

Haitao Xu, Jiansong Wu, Lijuan Qi et al.

Journal of Applied Electrochemistry • 2018

Jingkun Li, Moulay Tahar Sougrati, Andrea Zitolo et al.

Nature Catalysis • 2020

J.C. Carrillo-Rodríguez, Selvia García-Mayagoitia, R. Pérez-Hernández et al.

Journal of Power Sources • 2019

Yilin Yang, Miao Li, Rui Liu et al.

Journal of Cleaner Production • 2021

Mustapha Omenesa Idris, Mohamad Nasir Mohamad Ibrahim, Nur Asshifa Md Noh et al.

Chemical Engineering Journal • 2023

Kalimuthu Jawaharraj, Saurabh Sudha Dhiman, Sierra Bedwell et al.

Bioresource Technology • 2020

Yang Yang, Dingding Ye, Xun Zhu et al.

International Journal of Hydrogen Energy • 2018

Azra Qavami, Shahram Ghasemi

Materials Science and Engineering B • 2021

Qizhan Zhang, Minghua Zhou, Gengbo Ren et al.

Nature Communications • 2020

Hydrogen peroxide (H 2 O 2 ) synthesis by electrochemical oxygen reduction reaction has attracted great attention as a green substitute for anthraquinone process. However, low oxygen utilization efficiency (<1%) and high energy consumption remain obstacles. Herein we propose a superhydrophobic natural air diffusion electrode (NADE) to greatly improve the oxygen diffusion coefficient at the cathode about 5.7 times as compared to the normal gas diffusion electrode (GDE) system. NADE allows the oxygen to be naturally diffused to the reaction interface, eliminating the need to pump oxygen/air to overcome the resistance of the gas diffusion layer, resulting in fast H 2 O 2 production (101.67 mg h -1 cm -2 ) with a high oxygen utilization efficiency (44.5%-64.9%). Long-term operation stability of NADE and its high current efficiency under high current density indicate great potential to replace normal GDE for H 2 O 2 electrosynthesis and environmental remediation on an industrial scale.

A TOFIGHI, Mostafa Rahimnejad, Mohsen Ghorbani

Journal of Thermal Analysis and Calorimetry • 2018

Gottfried Suppan, Mayra Briones-Macías, Esteban Pazmiño-Arias et al.

physica status solidi (b) • 2020

The fabrication of advanced graphene‐based electrodes is currently an open research topic because of their potential in a broad range of applications, such as in light‐emitting diodes, field‐effect transistors, solar cells, supercapacitors, batteries, electrochemical energy storage, and sensors, which can be traced back to their remarkable electronic, mechanical, optical, and thermal properties. Herein, the fabrication and characterization of metal‐free few layer graphene‐based composite electrodes for oxygen reduction reaction (ORR) applications is reported. Electrodes’ characterization and performance are assessed using Raman spectroscopy, cyclic voltammetry, and electrochemical impedance spectroscopy. The electrocatalytic activity for ORR is elucidated by determination of the reaction onset potential at different pH values. The best formulation shows cathodic peak current density up to −469 μA cm −2 , accompanied by the lowest potential peak separation of 0.17 V and the lowest charge transfer resistance of 1657 Ω cm −2 , which is almost five times lower if compared with the composite electrode without graphene. The results suggest that similar nanocomposites electrodes might be potentially exploited in life processes such as biological respiration, and in energy converting systems such as fuel cells or microbial fuel cells.

Zhiliang Li, Shengke Yang, Yanan Song et al.

Environmental Technology • 2018

Most studies conducted nowadays to boost electrode performance in microbial fuel cell (MFC) have focused on carbonaceous materials. The titanium suboxides (Ti 4 O 7 , TS) are able to provide a new alternative for achieving better performance in MFC and have been tested and demonstrated in this study. The Ti 4 O 7 electrode with high electrochemical activity was modified by graphene/polyaniline by the constant potential method. Electrogenic microorganisms were more conducive to adhere to the anode electrode due to the presence of graphene/polyaniline. The MFC reactor with polyaniline /graphene modified TS (TSGP) anode achieves the highest voltage with 980 mV, and produces a peak power density of 2073 mW/m 2 , which is 2.9 and 12.7 times of those with the carbon cloth anode, respectively, at the 1000 Ω external resistance. In addition, this study evaluates the effects of anolyte conductivity, pH, and COD on the treatment of oil-containing restaurant wastewater (OCRW) in MFC using TSGP anode. The OCRW amended with 120 mS/cm obtains the lowest internal resistance (160.3 Ω). Increasing the anodic pH, gradually from acidic (pH 5.5) to alkaline conditions (pH 8.0), resulted in a gradual increase in maximum power density to 576.4 mW/m 2 and a decrease in internal cell resistance to 203.7 Ω. The MFC at the COD 1500 mg/L could obtain steady-state output voltage during 103 h while removing up to 65.2% of the COD of the OCRW.

Yu Zhong, Xinhui Xia, Fan Shi et al.

Advanced Science • 2016

High-performance electrode materials are the key to advances in the areas of energy conversion and storage (e.g., fuel cells and batteries). In this Review, recent progress in the synthesis and electrochemical application of transition metal carbides (TMCs) and nitrides (TMNs) for energy storage and conversion is summarized. Their electrochemical properties in Li-ion and Na-ion batteries as well as in supercapacitors, and electrocatalytic reactions (oxygen evolution and reduction reactions, and hydrogen evolution reaction) are discussed in association with their crystal structure/morphology/composition. Advantages and benefits of nanostructuring (e.g., 2D MXenes) are highlighted. Prospects of future research trends in rational design of high-performance TMCs and TMNs electrodes are provided at the end.

Wenming Tong, Mark Forster, Fabio Dionigi et al.

Nature Energy • 2020

A. S. Vishwanathan, Kartik Aiyer, L. A. Avinash Chunduri et al.

3 Biotech • 2016

Electrodes based on graphite, graphene, and carbon nanomaterials have been used in the anode chamber of microbial fuel cells (MFCs). Carbon quantum dots (C-dots) are a class of versatile nanomaterials hitherto not reported in MFCs. C-dots previously synthesized from coconut husk were reported to possess hydroxyl and carboxyl functional groups on their surface. The presence of these functional groups on a carbon matrix conferred on the C-dots the ability to conduct and transfer electrons. Formation of silver nanoparticles from silver nitrate upon addition of C-dots confirmed their reducing ability. DREAM assay using a mixed microbial culture containing C-dots showed a 172% increase in electron transfer activity and thus confirmed the involvement of C-dots in supplementing redox activity of a microbial culture. Addition of C-dots as a suspension in the anode chamber of an MFC resulted in a 22.5% enhancement in maximum power density. C-dots showed better performance as electron shuttles than methylene blue, a conventional electron shuttle used in MFCs.

Yimin Yan, Yanping Hou, Zebin Yu et al.

Chemosphere • 2021

Sangam Srikanth, U S Jayapiriya, Satish Kumar Dubey et al.

iScience • 2022

A simple, cost-effective and miniaturized lab-on-a-chip platform has been developed amenable to perform simultaneous cultivation and detection of bacteria. A microfluidic chamber was integrated to screen-printed electrodes for electrochemical detection of bacteria. The temperature required for the bacterial culture was provided through the optimized laser-induced graphene heaters. The concentration of bacteria was quantified accurately with the three-electrode system in the range of 2 × 10 4 to 1.1 × 10 9 CFU/mL without any need of biological modifications to the electrodes. The viability of cultured bacteria in the microfluidic device was also confirmed through fluorescent imaging. Furthermore, the metabolic activity of the cultured bacteria was validated through a miniaturized microbial fuel cell. Furthermore, the specificity of electrodes was also performed through electrochemical technique. Finally, a handheld and portable lab-on-a-chip platform was realized by 3D packaging, integrated with a portable potentiostat for real-time and on-field applications.

Jinming Luo, Liming Yang, Liming Yang et al.

Chemical Engineering Journal • 2019

Qing Xia, Rui Liu, Xueqin Chen et al.

Research • 2023

Metal nanomaterials can facilitate microbial extracellular electron transfer (EET) in the electrochemically active biofilm. However, the role of nanomaterials/bacteria interaction in this process is still unclear. Here, we reported the single-cell voltammetric imaging of Shewanella oneidensis MR-1 at the single-cell level to elucidate the metal-enhanced EET mechanism in vivo by the Fermi level-responsive graphene electrode. Quantified oxidation currents of ~20 fA were observed from single native cells and gold nanoparticle (AuNP)-coated cells in linear sweep voltammetry analysis. On the contrary, the oxidation potential was reduced by up to 100 mV after AuNP modification. It revealed the mechanism of AuNP-catalyzed direct EET decreasing the oxidation barrier between the outer membrane cytochromes and the electrode. Our method offered a promising strategy to understand the nanomaterials/bacteria interaction and guide the rational construction of EET-related microbial fuel cells.

Asim Ali Yaqoob, Albert Serrà, Mohamad Nasir Mohamad Ibrahim et al.

Arabian Journal of Chemistry • 2021

Although microbial fuel cells (MFCs) rank among the most promising bioelectrochemical approaches for generating energy while removing pollutants from wastewater, their relatively poor performance, largely due to electrode material that hinder their applicability, has limited their commercial viability. Thus, in our study, self-assembled modified graphene oxide (GO) anodes were developed from oil palm (Elaeis guineensis) biomass, and several techniques were applied to assess the physiochemical properties of material synthesized with waste material. Ultimately, the waste material was an excellent source for generating energy in the form of anodes in MFCs. The bioinspired modified GO anodes demonstrated greater energy output (135.96 mA/m2) of more than eight times the unmodified GO anodes (15.65 mA/m2), even though the source of inoculation was synthetic wastewater with 100 ppm of Cd (II) solution. To our knowledge, no work has reported removing Cd (II) from synthetic wastewater by using waste-derived anodes via MFCs. This paper reports on the utilization of waste-derived organic waste (oil palm trunk sap) as an organic substrate which is a healthy source of nutrients for bacteria in an inoculated media. Along with evidence of their electrochemical and biological character, the primary result achieved (i.e., 90% removal efficiency) supports using MFCs on an industrial scale.

Yuting He, Qian Fu, Yuan Pang et al.

iScience • 2021

Bioelectrochemical systems (BESs) can fulfill the demand for renewable energy and wastewater treatment but still face significant challenges to improve their overall performance. Core efforts have been made to enhance the bioelectrode performance, yet, previous approaches are fragmented and have limited applicability, unable to flexibly adjust physicochemical and structural properties of electrodes for specific requirements in various applications. Here, we propose a facile electrode design strategy that integrates three-dimensional printing technology and functionalized modular electrode materials. A customized graphene-based electrode with hierarchical pores and functionalized components (i.e., ferric ions and magnetite nanoparticles) was fabricated. Owing to efficient mass and electron transfer, a high volumetric current density of 10,608 ± 1,036 A/m 3 was achieved, the highest volumetric current density with pure Geobacter sulfurreducens to date. This strategy can be readily applied to existing BESs (e.g., microbial fuel cells and microbial electrosynthesis) and provide a feasibility for practical application.

Muhammad Nihal Naseer, Asad A. Zaidi, Hamdullah Khan et al.

Energy Reports • 2021

Microbial fuel cell (MFC) has received much attention in the last decade as a promising technology to simultaneously generate electricity and decontaminate wastewater. This study aims to quantitatively review the published literature on MFC, published in the period of 1970–2020, based on the Web of Science (WoS) database. For the first time in literature, a comprehensive quantitative review of MFC has been conducted by employing the technique of bibliometric and content analyses. A total of 11,397 publications have been retrieved from WoS, out of which 81.6% are research articles. The evaluation in the field of MFC has been mapped in various categories, such as publication history, publication distribution, subject category distribution, leading journals, leading countries and leading organizations in MFC research. Additionally, content analysis has been conducted to unearth the research trends in MFC; and some hot research topics in MFC have been spotted. Results depict that the period 2011–2020 has been the most appreciating era for MFC research, as it contributed 87% of the total publications. Among the subject categories, energy fuel and microbiology lead with contributions of 26.5% for each, butthe overall growth of the energy fuel category in the last decade has been the highest. Out of 1,147 journals publishing MFC research, Bioresource Technology is the leading one; and countries like China, USA and India are the main hub of MFC research with 26.47%, 16.95% and 7.69% contributions in publications, respectively. The hottest topics in MFC research are nanoparticles, catalysts, air electrodes, graphene electrodes, power enhancement, air cathode and nitrogen removal. Moreover, major research areas are engineering, energy fuels and biotechnology with each contribution 26.5% of the total publications.

Zhiliang Li, Shengke Yang, Yanan Song et al.

International Journal of Hydrogen Energy • 2019

Luye Chen, Youzhi Li, Jiani Yao et al.

Journal of Power Sources • 2018

Long Zou, Yunhong Huang, Xian Wu et al.

Journal of Power Sources • 2018

Yang Hou, Heyang Yuan, Zhenhai Wen et al.

Journal of Power Sources • 2016

Toby P. Call, Tian Carey, Paolo Bombelli et al.

Journal of Materials Chemistry A • 2017

Microbial fuel cells (MFCs) exploit the ability of microorganisms to generate electrical power during metabolism of substrates. However, the low efficiency of extracellular electron transfer from cells to the anode and the use of expensive rare metals as catalysts, such as platinum, limit their application and scalability. In this study we investigate the use of pristine graphene based electrodes at both the anode and the cathode of a MFC for efficient electrical energy production from the metabolically versatile bacterium Rhodopseudomonas palustris CGA009. We achieve a volumetric peak power output ( P V ) of up to 3.51 ± 0.50 W m -3 using graphene based aerogel anodes with a surface area of 8.2 m 2 g -1 . We demonstrate that enhanced MFC output arises from the interplay of the improved surface area, enhanced conductivity, and catalytic surface groups of the graphene based electrode. In addition, we show a 500-fold increase in P V to 1.3 ± 0.23 W m -3 when using a graphene coated stainless steel (SS) air cathode, compared to an uncoated SS cathode, demonstrating the feasibility of a platinum-free, graphene catalysed MFCs. Finally, we show a direct application for microwatt-consuming electronics by connecting several of these coin sized devices in series to power a digital clock.

Jia Yi Chen, Pu Xie, Ze Ping Zhang

Chemical Engineering Journal • 2018

Timoth Mkilima, Yerkebulan Zharkenov, Aisulu Abduova et al.

Case Studies in Chemical and Environmental Engineering • 2025

The increasing discharge of pharmaceuticals and nitrates into aquatic environments poses significant ecological and public health risks, as conventional wastewater treatment plants often fail to achieve complete removal. Microbial fuel cells (MFCs) offer a bioelectrochemical approach for simultaneous wastewater treatment and energy generation; however, their efficiency is constrained by slow electron transfer. This study investigated the bioelectrochemical degradation of pharmaceuticals and nitrates in wastewater using a dual-chamber MFC equipped with graphene-coated carbon cloth anodes to enhance microbial electron transfer. Wastewater samples were collected from a municipal treatment plant and a pharmaceutical discharge site, while electroactive bacteria enriched from anaerobic sludge served as biocatalysts. Pollutant degradation was analyzed using high-performance liquid chromatography (HPLC) and ion chromatography (IC), and electrochemical performance was assessed through open-circuit voltage (OCV), power density, cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). The results demonstrated that graphene-coated anodes enhanced pharmaceutical degradation from 62.3% to 87.6% and nitrate removal from 58.4% to 83.2% over 72 hours. Power density increased by 93.6% (from 405.6 mW/m 2 to 785.3 mW/m 2 ), while internal resistance decreased by 37.5%, indicating improved electron transfer. Biofilm analysis revealed a 55.9% increase in thickness and a 48.3% higher microbial cell density on graphene-coated anodes, with metagenomic sequencing confirming the dominance of Geobacter and Shewanella . These findings highlight the potential of graphene-modified MFCs as a sustainable and scalable technology for real wastewater treatment.

Ahmed ElMekawy, Hanaa M. Hegab, Dušan Lošić et al.

Renewable and Sustainable Energy Reviews • 2016

Anoud Saud Alshammari

International Journal of Environmental Science and Technology • 2023

Omar Francisco González Vázquez, Claudio Frausto Reyes, Martín Ortiz Morales et al.

International Journal of Hydrogen Energy • 2022