Surface adsorbed hydroxyl: a double-edged sword in electrochemical CO2 reduction over oxide-derived copper

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題名:	Surface adsorbed hydroxyl: a double-edged sword in electrochemical CO2 reduction over oxide-derived copper
作者:	Daixing Wei, Yiqing Wang, Prof. Chung-Li Dong, Ta Thi Thuy Nga, Yuchuan Shi, Jialin Wang, Xiaoli Zhao, Prof. Fan Dong, Prof. Shaohua Shen
日期:	2023-06-27
上傳時間:	2024-07-30 12:06:09 (UTC+8)
出版者:	Wiley-VCH
摘要:	Oxide-derived Cu (OD−Cu) featured with surface located sub-20 nm nanoparticles (NPs) created via surface structure reconstruction was developed for electrochemical CO2 reduction (ECO2RR). With surface adsorbed hydroxyls (OHad) identified during ECO2RR, it is realized that OHad, sterically confined and adsorbed at OD−Cu by surface located sub-20 nm NPs, should be determinative to the multi-carbon (C2) product selectivity. In situ spectral investigations and theoretical calculations reveal that OHad favors the adsorption of low-frequency CO with weak C≡O bonds and strengthens the CO binding at OD−Cu surface, promoting *CO dimerization and then selective C2 production. However, excessive OHad would inhibit selective C2 production by occupying active sites and facilitating competitive H2 evolution. In a flow cell, stable C2 production with high selectivity of ∼60 % at −200 mA cm−2 could be achieved over OD−Cu, with adsorption of OHad well steered in the fast flowing electrolyte.
關聯:	Angewandte Chemie 62(31), e202306876
DOI:	10.1002/anie.202306876
顯示於類別:	[電機工程學系暨研究所] 期刊論文

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