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    題名: Controlling the oxidation state of Cu electrode and reaction intermediates for electrochemical CO2 reduction to ethylene
    作者: Chou, Tsu-Chin;Chang, Chiao-Chun;Yu, Hung-Ling;Yu, Wen-Yueh;Dong, Chung-Li;Juan-Jesús, Velasco-Vélez;Chuang, Cheng-Hao;Chen, Li-Chyong;Lee, Jyh-Fu;Chen, Jin-Ming;Wu, Heng-Liang
    日期: 2020-01-20
    上傳時間: 2021-05-05 12:11:58 (UTC+8)
    摘要: Understanding the role of the oxidation state of the Cu surface and surface-adsorbed intermediate species in electrochemical CO2 reduction is crucial for the development of selective CO2-to-fuel electrocatalysts. In this study, the electrochemical CO2 reduction mechanism over the Cu catalysts with various oxidation states was studied by using in situ surface-enhanced infrared absorption spectroscopy (SEIRAS), in situ soft X-ray absorption spectroscopy (Cu L-edge), and online gas chromatography measurements. The atop-adsorbed CO (COatop) intermediate is obtained on the electrodeposited Cu surface which primarily has the oxidation state of Cu(I). COatop is further reduced, followed by the formation of C1 product such as CH4. The residual bridge-adsorbed CO (CObridge) is formed on the as-prepared Cu surface with Cu(0) which inhibits hydrocarbon formation. In contrast, the CV-treated Cu electrode prepared by oxidizing the as-prepared Cu surface contains different amounts of Cu(I) and Cu(0) states. The major theme of this work is that in situ SEIRAS results show the coexistence of COatop and CObridge as the reaction intermediates during CO2 reduction and that the selectivity of CO2-to-ethylene conversion is further enhanced in the CV-treated Cu electrode. The Cu catalysts modulated by the electrochemical method exhibit different oxidation states and reaction intermediates as well as electrocatalytic properties.
    關聯: Journal of the American Chemical Society 142, p.2857-2867
    DOI: 10.1021/jacs.9b11126
    顯示於類別:[電機工程學系暨研究所] 期刊論文

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