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Intercalated Iridium Diselenide Electrocatalysts for Efficient pH‐Universal Water Splitting
Author(s) -
Zheng Tingting,
Shang Chunyan,
He Zhihai,
Wang Xinyi,
Cao Cong,
Li Hongliang,
Si Rui,
Pan Bicai,
Zhou Shiming,
Zeng Jie
Publication year - 2019
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201909369
Subject(s) - water splitting , bifunctional , oxygen evolution , iridium , catalysis , diselenide , intercalation (chemistry) , inorganic chemistry , hydrogen , electrolysis , materials science , chemistry , electrocatalyst , electrolysis of water , electrochemistry , electrode , chemical engineering , electrolyte , metallurgy , organic chemistry , photocatalysis , selenium , engineering
Developing bifunctional catalysts for both hydrogen and oxygen evolution reactions is a promising approach to the practical implementation of electrocatalytic water splitting. However, most of the reported bifunctional catalysts are only applicable to alkaline electrolyzer, although a few are effective in acidic or neutral media that appeals more to industrial applications. Here, a lithium‐intercalated iridium diselenide (Li‐IrSe 2 ) is developed that outperformed other reported catalysts toward overall water splitting in both acidic and neutral environments. Li intercalation activated the inert pristine IrSe 2 via bringing high porosities and abundant Se vacancies for efficient hydrogen and oxygen evolution reactions. When Li‐IrSe 2 was assembled into two‐electrode electrolyzers for overall water splitting, the cell voltages at 10 mA cm −2 were 1.44 and 1.50 V under pH 0 and 7, respectively, being record‐low values in both conditions.