Voltage-and time-dependent valence state transition in cobalt oxide catalysts observed by in-operando soft-x ray spectroscopy during oxygen evolution reaction

淡江大學機構典藏 > 工學院 > 電機工程學系暨研究所 > 期刊論文 > Item 987654321/120726

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題名:	Voltage-and time-dependent valence state transition in cobalt oxide catalysts observed by in-operando soft-x ray spectroscopy during oxygen evolution reaction
作者:	Zhou, J.;Zhang, L.;Huang, Y. C.;Dong, C. L.;Lin, H. J.;Chen, C. T.;Tjeng, L. H.;Hu, Z.
日期:	2020-04-24
上傳時間:	2021-05-05 12:12:17 (UTC+8)
摘要:	The ability to determine the electronic structure of catalysts during electrochemical reactions is highly important for identification of the active sites and the reaction mechanism. Here we successfully applied soft X-ray spectroscopy to follow in operando the valence and spin state of the Co ions in Li2Co2O4 under oxygen evolution reaction (OER) conditions. We have observed that a substantial fraction of the Co ions undergo a voltage-dependent and time-dependent valence state transition from Co3+ to Co4+ accompanied by spontaneous delithiation, whereas the edge-shared Co–O network and spin state of the Co ions remain unchanged. Density functional theory calculations indicate that the highly oxidized Co4+ site, rather than the Co3+ site or the oxygen vacancy site, is mainly responsible for the high OER activity.
關聯:	Nature Communications 11, 1-10
DOI:	10.1038/s41467-020-15925-2
顯示於類別:	[電機工程學系暨研究所] 期刊論文

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