期刊
NATURE MATERIALS
卷 18, 期 8, 页码 827-+出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41563-019-0399-z
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资金
- Artificial Photosynthesis Project of the New Energy and Industrial Technology Development Organization (NEDO)
- Japan Society for the Promotion of Science [16H02417]
- Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
Oxysulfide semiconductors have narrow bandgaps suitable for water splitting under visible-light irradiation, because the electronegative sulfide ions negatively shift the valence band edges of the corresponding oxides(1,2). However, the instability of sulfide ions during the water oxidation is a critical obstacle to simultaneous evolution of hydrogen and oxygen(3). Here, we demonstrate the activation and stabilization of Y2Ti2O5S2, with a bandgap of 1.9 eV, as a photocatalyst for overall water splitting. On loading of IrO2 and Rh/Cr2O3 as oxygen and hydrogen evolution co-catalysts, respectively, and fine-tuning of the reaction conditions, simultaneous production of stoichiometric amounts of hydrogen and oxygen was achieved on Y2Ti2O5S2 during a 20 h reaction. The discovery of the overall water splitting capabilities of Y2Ti2O5S2 extends the range of promising materials for solar hydrogen production.
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