Enhancing oxygen reduction reaction by using metal-free nitrogen-doped carbon black as cathode catalysts in microbial fuel cells treating wastewater

Wang, Xiujun; Chen, Yuan; Shao, Chunfeng; Zhuang, Shiguang; Ye, Jianshan; Li, Baitao

doi:10.1016/j.envres.2019.109011

Cited by 49 publications

(18 citation statements)

References 65 publications

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“…In addition, the power was approximately constant without augmentation in CNT/Pt of over 0.3 mg/cm 2 . The latter result shows that the diffusion resistance of the cathode raised because of a depletion in the oxygen diffusion rate that offsets the elevation of the catalyst [38].…”

Section: Power Densitymentioning

confidence: 91%

Carbon Nanotube/Pt Cathode Nanocomposite Electrode in Microbial Fuel Cells for Wastewater Treatment and Bioenergy Production

2021

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In this paper, we reported the fabrication, characterization, and application of carbon nanotube (CNT)-platinum nanocomposite as a novel generation of cathode catalyst in microbial fuel cells (MFCs) for sustainable energy production and wastewater treatment. The efficiency of the carbon nanocomposites was compared by platinum (Pt), which is the most effective and common cathode catalyst. This nanocomposite is utilized to benefit from the catalytic properties of CNTs and reduce the amount of required Pt, as it is an expensive catalyst. The CNT/Pt nanocomposites were synthesized via a chemical reduction technique and the electrodes were characterized by field emission scanning electron microscopy, electronic dispersive X-Ray analysis, and transmission electron microscopy. The nanocomposites were applied as cathode catalysts in the MFC to obtain polarization curve and coulombic efficiency (CE) results. The catalytic properties of electrodes were tested by linear sweep voltammetry. The CNT/Pt at the concentration of 0.3 mg/cm2 had the highest performance in terms of CE (47.16%), internal resistance (551 Ω), COD removal (88.9%), and power generation (143 mW/m2). In contrast, for the electrode with 0.5 mg/L of Pt catalyst, CE, internal resistance, COD removal, and power generation were 19%, 810 Ω, 96%, and 84.1 mW/m2, respectively. So, it has been found that carbon nanocomposite cathode electrodes had better performance for sustainable clean energy production and COD removal by MFC.

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Section: Power Densitymentioning

confidence: 91%

Carbon Nanotube/Pt Cathode Nanocomposite Electrode in Microbial Fuel Cells for Wastewater Treatment and Bioenergy Production

2021

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“…[ 31 ] Special attention should be paid to pyridinic N that has a positive linear correlation with the maximum power density, suggesting pyridinic N is the major positive contribution to the performance in MFCs. [ 64 ] Different from these conclusions, Liang et al [ 65 ] found that graphitic N can promote electron transfer and improve conductivity when studying nitrogen‐doped MFCs cathode catalysts.…”

Section: Development Of Carbon‐based Composites For Mfc Cathodesmentioning

confidence: 99%

Advances in Understanding Carbon Composite Catalysts Based on Cathode for Microbial Fuel Cells

Zhang

Liu

et al. 2021

Energy Tech

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Single‐chamber microbial fuel cells (MFCs) with a simple structure and superior performance have been extensively studied. However, due to the sluggish kinetics of the cathode oxygen reduction reaction (ORR), the power generation of MFCs is greatly constrained. It is highly desirable to explore efficient cathode catalysts for reducing the overpotential to improve the electrochemical performance of MFCs. To date, a considerable number of carbon‐based composites have exhibited comparable power generation capacity to Pt in MFCs, showing the great potential in the development of remarkable performance and low‐cost cathode ORR catalysts. Herein, recent achievements of carbon‐based composites of air‐cathodes based on single‐chamber MFCs are summarized, mainly focusing on the selection of carbon‐based materials, composite synthesis methods, and structural regulation on the nanoscale. The key factors affecting the ORR in composites are also discussed. The crucial challenges of MFCs that still need to be resolved are further summed up before practical applications and scale‐up fabrication. Particularly, this review focuses on the design strategies and preparation methods of functional carbon‐based composites to boost the performance of MFCs, aiming to provide some scientific directions to develop advanced materials for MFCs in the future.

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“…Electrons pass through the external circuit and protons pass through the intermediate membrane to the cathode 10 . In general, substances with high reduction potential could be used as electron acceptors for MFCs, such as oxygen 11 . With oxidizing substances as MFCs acceptor, the MFC device could reduce heavy metals in the cathode, consume organic pollutants in the anode, and harvest bioelectricity simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Biocathode electrochemical activity and reduction characteristics of Cr(VI) system in microbial fuel cells

Zhang

Zhao

Wang

et al. 2023

J of Chemical Tech & Biotech

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BACKGROUND The biocathode of microbial fuel cells (MFCs) offers a simple method for the reductive treatment of Cr(VI), and Cr(VI) is an electron acceptor in cathodes in MFCs. In this study, MFCs with different Cr(VI) contents (7.07–35.35 mg L−1) were considered to evaluate the overall performance of MFCs. RESULTS The results of electrochemical analysis confirmed that the MFC‐2 biocathode exhibited a higher effective reaction surface, stronger conductivity, and smaller charge transfer resistance (53.63 Ω) than the others. In addition, Cr(VI) had a power output of 75.6 mW m−2 in MFC‐2 and a Cr(VI) cathodic coulombic efficiency of 103.8%. With 14.14 mg L−1 Cr(VI) content, the cathode microbe had the best activity. Cr(VI) reduction followed a pseudo‐first‐order kinetic model, with the rate constant being 0.0139 h−1. Meanwhile, this study analyzed the Cr(VI) reduction in MFCs and the release and acceptance of electrons and protons. Electrically active bacteria such as Proteobacteria were highly enriched on the anode and cathode biofilm, while the Cr(VI)‐reducing bacteria Gammaproteobacteria increased in the biofilm of the cathode. CONCLUSION This study helps in the selection of Cr(VI) concentration for the cathode, guaranteeing microbial activity and power generation performance. Microbes have the best electrochemical activity in MFC‐2 (14.14 mg L−1). Meanwhile, the change in anode microbial activity was affected by cathode performance. The microbial community was significantly influenced by Cr(VI). © 2023 Society of Chemical Industry (SCI).

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Enhancing oxygen reduction reaction by using metal-free nitrogen-doped carbon black as cathode catalysts in microbial fuel cells treating wastewater

Cited by 49 publications

References 65 publications

Carbon Nanotube/Pt Cathode Nanocomposite Electrode in Microbial Fuel Cells for Wastewater Treatment and Bioenergy Production

Carbon Nanotube/Pt Cathode Nanocomposite Electrode in Microbial Fuel Cells for Wastewater Treatment and Bioenergy Production

Advances in Understanding Carbon Composite Catalysts Based on Cathode for Microbial Fuel Cells

Biocathode electrochemical activity and reduction characteristics of Cr(VI) system in microbial fuel cells

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