Oxysulfide photocatalyst for visible-light-driven overall water splitting
Oxysulfide photocatalyst for visible-light-driven overall water splitting
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DOI：
10.1038/s41563-019-0399-z
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发表时间：
2019-08-01
期刊：
影响因子：
41.2
通讯作者：
Domen, Kazunari
中科院分区：
文献类型：
--
作者：
Wang, Qian;Nakabayashi, Mamiko;Domen, Kazunari
硫氧化物半导体具有窄的带隙，适合在可见光照射下分解水，因为电负性硫离子使相应氧化物的价带边缘负向移动（1，2）。然而，在水氧化过程中硫离子的不稳定性是同时释放氢和氧的关键障碍（3）。在这里，我们证明了激活和稳定的Y2 Ti 2 O 5S 2，具有1.9 eV的带隙，作为光催化剂整体水分解。负载IrO 2和Rh/Cr2 O3作为析氧和析氢的助催化剂，分别和微调的反应条件下，同时生产的化学计量的量的氢和氧在20小时的反应期间实现的Y2 Ti 2 O 5S 2。Y2 Ti 2 O 5S 2的整体水分解能力的发现扩展了太阳能制氢的有前途材料的范围。
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.