In-situ/operando capturing unusual Ir6+ facilitating ultrafast electrocatalytic water oxidation
學年 110
學期 1
出版（發表）日期 2021-10-20
作品名稱 In-situ/operando capturing unusual Ir6+ facilitating ultrafast electrocatalytic water oxidation
作品名稱（其他語言）
著者 Lili Li; Hainan Sun; Zhiwei Hu; Jing Zhou; Yu-Cheng Huang; Haoliang Huang; Sanzhao Song; Chih-Wen Pao; Yu-Chung Chang; Alexander C. Komarek; Hong-Ji Lin; Chien-Te Chen; Chung-Li Dong; Jian-Qiang Wang; Linjuan Zhang
單位
出版者
著錄名稱、卷期、頁數 Advanced Functional Materials 31(43), 2104746
摘要 Identifying real active sites and understanding the mechanism of oxygen evolution reaction (OER) are still a big challenge today for developing efficient electrochemical catalysts in renewable energy technologies. Here, using a combined in situ/operando experiments and theory, the catalytic mechanism of the ordered OER active Co and Ir ions in Sr2CoIrO6−δ is studied, which exhibits an unprecedented low overpotential 210 mV to achieve 10 mA cm–2, ranking the highest performance among perovskite-based solid-state catalysts. Operando X-ray absorption spectroscopies as a function of applied voltage indicates that Ir4+ ion is gradually converted into extremely high-valence Ir5+/6+, while the part of Co3+ ion is transferred into Co4+ under OER process. Density functional theory calculations explicitly reveal the order Co-O-Ir network as an origin of ultrahigh OER activity. The work opens a promising path to overcome the sluggish kinetics of OER bottleneck for water splitting via proper arrangements of the multi-active sites in catalyst.
關鍵字
語言 en_US
ISSN 1616-301X; 1616-3028
期刊性質 國外
收錄於 SCI
產學合作
通訊作者
審稿制度 否
國別 DEU
公開徵稿
出版型式 ,電子版,紙本
SDGS 優質教育,可負擔的潔淨能源,氣候行動,夥伴關係