Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 58, Issue 41, Pages 14764-14769Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201909369
Keywords
electrocatalysis; iridium diselenide; lithium intercalation; overall water splitting
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Funding
- NSFC [U1732149, 21573206]
- Key Research Program of Frontier Sciences of the CAS [QYZDB-SSW-SLH017]
- Anhui Provincial Key Scientific and Technological Project [1704a0902013]
- Major Program of Development Foundation of Hefei Center for Physical Science and Technology [2017FXZY002]
- Fundamental Research Funds for the Central Universities
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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-IrSe2) is developed that outperformed other reported catalysts toward overall water splitting in both acidic and neutral environments. Li intercalation activated the inert pristine IrSe2 via bringing high porosities and abundant Se vacancies for efficient hydrogen and oxygen evolution reactions. When Li-IrSe2 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.
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