Selective electro-oxidation of aliphatic alcohols into value-added carboxylates at lower potentials than that of the oxygen evolution reaction (OER) is an environmentally and economically desirable anode reaction for clean energy storage and conversion technologies. However, it is challenging to achieve both high selectivity and high activity of the catalysts for the electro-oxidation of alcohols, such as the methanol oxidation reaction (MOR). Herein, a monolithic CuS@CuO/copper-foam electrode for the MOR with superior catalytic activity and almost 100% selectivity for formate is reported. In the core-shell CuS@CuO nanosheet arrays, the surface CuO directly catalyzes MOR, while the subsurface sulfide not only serves as an inhibitor to attenuate the oxidative power of the surface CuO to achieve selective oxidation of methanol to formate and prevent over-oxidation of formate to CO2 but also serves as an activator to form more surface O defects as active sites and enhances the methanol adsorption and charge transfer to achieve superior catalytic activity. CuS@CuO/copper-foam electrodes can be prepared on a large scale by electro-oxidation of copper-foam at ambient conditions and can be readily utilized in clean energy technologies.
|Original language||English (US)|
|State||Published - Apr 3 2023|
Bibliographical noteKAUST Repository Item: Exported on 2023-04-06
Acknowledgements: This work was supported by funding from the National Natural Science Foundation of China (21975240), Anhui Provincial Natural Science Foundation (1908085J19), Fundamental Research Funds for the Central Universities (WK5290000001, WK2060190102, and WK3450000007), and King Abdullah University of Science and Technology (KAUST). M.K. acknowledges the Chinese Academy of Science (CAS) and TWAS for supporting his Ph.D. study at the University of Science and Technology of China in the category of the 2019 CAS-TWAS President's Fellowship Awardee (series no. 2019-184). M.I.A. acknowledges the local challenge fund LCF-7 (2020) World Bank-funded HEDP project by the Higher Education Commission Pakistan for supporting his postdoctoral research at the Department of Chemistry, Government College University Lahore Pakistan.
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