Metal selenide photocatalysts for visible-light-driven Z-scheme pure water splitting
Metal selenide photocatalysts for visible-light-driven Z-scheme pure water splitting
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DOI：
10.1039/c9ta00768g
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发表时间：
2019-04-07
影响因子：
11.9
通讯作者：
Domen, Kazunari
中科院分区：
文献类型：
--
作者：
Chen, Shanshan;Ma, Guijun;Domen, Kazunari
具有窄带隙的颗粒状金属硒化物用于光催化整体纯水分解尚未报道，这是由于此类材料的严重自光氧化。目前的工作表明，硒化锌和硒化铜镓（ZnSe：CGSe），吸收边范围从480至750 nm，可以采用作为H-2的析氢光催化剂在颗粒光催化剂片的Z-计划纯水裂解，其中CoOx/BiVO 4和Au分别用作析氧光催化剂和电子介体。金属硒化物中的光生空穴通过Au层与来自BiVO（4）的电子有效地复合，从而避免硒化物的自氧化并导致稳定的纯水裂解。改变ZnSe：CGSe的组成表明，硒化物的p型半导体特性和优异的光电化学性质对于有效的Z-方案水裂解是至关重要的。该研究拓展了金属硒化物在光催化分解纯水中的应用领域，为硒化物基光催化体系用于太阳能燃料生产创造了新的机会。
Particulate metal selenides having narrow bandgaps for photocatalytic overall pure water splitting have not yet been reported due to the severe self-photooxidation of such materials. The present work demonstrates that solid solutions of zinc selenide and copper gallium selenide (ZnSe:CGSe), with absorption edges ranging from 480 to 750 nm, can be employed as H-2 evolution photocatalysts in particulate photocatalyst sheets for Z-scheme pure water splitting, where CoOx/BiVO4 and Au are used as the oxygen evolution photocatalyst and electron mediator, respectively. Photogenerated holes in the metal selenide are efficiently recombined with electrons from BiVO(4)via the Au layer, thus avoiding self-oxidation of the selenides and leading to stable pure water splitting. Varying the ZnSe:CGSe composition demonstrates that both the p-type semiconductor character and excellent photoelectrochemical properties of selenides are vital to efficient Z-scheme water splitting. This study extends the application field of metal selenides in photocatalytic pure water splitting and creates new opportunities for selenide-based photocatalytic systems for solar fuel production.