Journal
ACS CATALYSIS
Volume 8, Issue 5, Pages 4288-4293Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.8b00719
Keywords
titania; oxygen vacancy; hydrogen evolution reaction; alkaline media; Ti3+ ions; water splitting; in situ STM observation
Categories
Funding
- Australian Research Council (ARC) [DP160102627, DP170102267, DP170101467]
- ARC Centres of Excellences for Electromaterials Science [CE140100012]
- National Natural Science Foundation of China [51272015, 51472016, 51672018, 21773124]
- Fundamental Research Funds for the Central Universities [YWF-16-JCTD-B-03]
- AIIM
- UOW-NIMS Joint Research Grant from the University of Wollongong
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Pursuing efficient and low-cost electrocatalysts is crucial for the performance of water alkali electrolyzers toward water splitting. Earth-abundant transition-metal oxides, in spite of their alluring performances in the oxygen evolution reaction, are thought to be inactive in the hydrogen evolution reaction in alkaline media. Here, we demonstrate that pure TiO2 single crystals, a typical transition-metal oxide, can be activated toward electrocatalytic hydrogen evolution reaction in alkaline media through engineering interfacial oxygen vacancies. Experimental and theoretical results indicate that subsurface oxygen vacancies and low-coordinated Ti ions (Ti3+) can enhance the electrical conductivity and promote electron transfer and hydrogen desorption, which activate reduced TiO2 single crystals in the hydrogen evolution reaction in alkaline media. This study offers a rational route for developing reduced transition-metal oxides for low-cost and highly active hydrogen evolution reaction catalysts, to realize overall water splitting in alkaline media.
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