Carbon Black‐Supported Single‐Atom CoNC as an Efficient Oxygen Reduction Electrocatalyst for H2O2 Production in Acidic Media and Microbial Fuel Cell in Neutral Media

Author:

Du Ying‐Xia12,Yang Qiao3,Lu Wang‐Ting45,Guan Qing‐Yu3,Cao Fei‐Fei1ORCID,Zhang Geng1ORCID

Affiliation:

1. Department of Chemistry College of Science Huazhong Agricultural University Wuhan 430070 P. R. China

2. College of Resources and Environment Huazhong Agricultural University Wuhan 430070 P. R. China

3. School of Ocean Science and Technology Dalian University of Technology Panjin 124221 P. R. China

4. Key Laboratory of Optoelectronic Chemical Materials and Devices Ministry of Education Jianghan University Wuhan 430056 P. R. China

5. Institute for Interdisciplinary Research, School of Optoelectronic Materials and Technology Jianghan University Wuhan 430056 P. R. China

Abstract

AbstractSingle metal atom isolated in nitrogen‐doped carbon materials (MNC) are effective electrocatalysts for oxygen reduction reaction (ORR), which produces H2O2 or H2O via 2‐electron or 4‐electron process. However, most of MNC catalysts can only present high selectivity for one product, and the selectivity is usually regulated by complicated structure design. Herein, a carbon black‐supported CoNC catalyst (CB@CoNC) is synthesized. Tunable 2‐electron/4‐electron behavior is realized on CB@Co‐N‐C by utilizing its H2O2 yield dependence on electrolyte pH and catalyst loading. In acidic media with low catalyst loading, CB@CoNC presents excellent mass activity and high selectivity for H2O2 production. In flow cell with gas diffusion electrode, a H2O2 production rate of 5.04 mol h−1 g−1 is achieved by CB@CoNC on electrolyte circulation mode, and a long‐term H2O2 production of 200 h is demonstrated on electrolyte non‐circulation mode. Meanwhile, CB@CoNC exhibits a dominant 4‐electron ORR pathway with high activity and durability in pH neutral media with high catalyst loading. The microbial fuel cell using CB@CoNC as the cathode catalyst shows a peak power density close to that of benchmark Pt/C catalyst.

Funder

National Natural Science Foundation of China

Fundamental Research Funds for the Central Universities

Chinese Academy of Sciences

Publisher

Wiley

Subject

Electrochemistry,Condensed Matter Physics,Biomaterials,Electronic, Optical and Magnetic Materials

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