Single‐Atom Co─O4 Sites Embedded in a Defective‐Rich Porous Carbon Layer for Efficient H2O2 Electrosynthesis

Author:

Zhang Shuai1,Tao Zheng1,Xu Mingyang1,Kan Lun1,Guo Chuanpan1,Liu Jiameng1,He Linghao1,Du Miao1,Zhang Zhihong1ORCID

Affiliation:

1. College of Material and Chemical Engineering Institute of New Energy Science and Technology School of Future Hydrogen Energy Technology Zhengzhou University of Light Industry Zhengzhou 450001 P. R. China

Abstract

AbstractThe production of hydrogen peroxide (H2O2) via the two‐electron electrochemical oxygen reduction reaction (2e ORR) is an essential alteration in the current anthraquinone‐based method. Herein, a single‐atom Co─O4 electrocatalyst is embedded in a defective and porous graphene‐like carbon layer (Co─O4@PC). The Co─O4@PC electrocatalyst shows promising potential in H2O2 electrosynthesis via 2e ORR, providing a high H2O2 selectivity of 98.8% at 0.6 V and a low onset potential of 0.73 V for generating H2O2. In situ surface‐sensitive attenuated total reflection Fourier transform infrared spectra and density functional theory calculations reveal that the electronic and geometric modification of Co─O4 induced by defective carbon sites result in decreased d‐band center of Co atoms, providing the optimum adsorption energies of OOH* intermediate. The H‐cell and flow cell assembled using Co─O4@PC as the cathode present long‐term stability and high efficiency for H2O2 production. Particularly, a high H2O2 production rate of 0.25 mol g−1cat h−1 at 0.6 V can be obtained by the flow cell. The in situ‐generated H2O2 can promote the degradation of rhodamine B and sterilize Staphylococcus aureus via the Fenton process. This work can pave the way for the efficient production of H2O2 by using Co─O4 single atom electrocatalyst and unveil the electrocatalytic mechanism.

Publisher

Wiley

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