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

jsp.display-item.identifier=請使用永久網址來引用或連結此文件: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/120726

题名:	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
上传时间:	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
显示于类别:	[電機工程學系暨研究所] 期刊論文

文件中的档案:

档案	描述	大小	格式	浏览次数
index.html		0Kb	HTML	200	检视/开启
Voltage-and time-dependent valence state transition in cobalt oxide catalysts observed by in-operando soft-x ray spectroscopy during oxygen evolution reaction.pdf		1276Kb	Adobe PDF	3	检视/开启

在機構典藏中所有的数据项都受到原著作权保护.

TAIR相关文章