Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/216632
Title: Rational design of an air-breathing gas-diffusion electrode with oxygen vacancy-rich ZnO for robust and durable H<sub>2</sub>O<sub>2</sub> electrosynthesis
Author: Sun, Y.
Xia, P.
Sheng, P.
Wang, Chao
You, J.
Deng, Q.
He, Quiang
Sirés Sadornil, Ignacio
Ye, Z.
Keywords: Oxigen
Aigua oxigenada
Electroquímica
Oxygen
Hydrogen peroxide
Electrochemistry
Issue Date: 8-Nov-2024
Publisher: Elsevier B.V.
Abstract: Developing cost-effective and durable cathodes with outstanding oxygen mass transport and selective two-electron oxygen reduction reaction (ORR) is crucial for large-scale H2O2 electrosynthesis. Herein, an oxygen vacancy-rich ZnO-modified air-breathing gas-diffusion electrode (ZnO-V/GDE) was fabricated, thus eliminating the cost of aeration while achieving remarkable O2 utilization efficiency and H2O2 selectivity. This novel cathode led to ultrahigh H2O2 yield of 1005.2 mg L−1 with selectivity of 74.6 %, outperforming both the raw and ZnO-modified air-breathing GDEs. Moreover, the practical applicability of ZnO-V/GDE was demonstrated by its high stability and effectiveness when treating micropollutants in wastewater by ZnO-V/GDE-based electro-Fenton process. Mechanistic insights unveiled the key roles of oxygen vacancies, which not only facilitate the O2 transport by creating a superhydrophobic interface and provide binding centers to O2, but also reduce the energy barrier of the rate-determining step (OOH*-to-H2O2), eventually enhancing the ORR performance.
Note: Versió postprint del document publicat a: https://doi.org/10.1016/j.cej.2024.157563
It is part of: Chemical Engineering Journal, 2024, vol. 500, p. 157563
URI: https://hdl.handle.net/2445/216632
Related resource: https://doi.org/10.1016/j.cej.2024.157563
ISSN: 1385-8947
Appears in Collections:Articles publicats en revistes (Ciència dels Materials i Química Física)

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