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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7-11-2026
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