A particulate (ZnSe)0.85(CuIn0.7Ga0.3Se2)0.15 photocathode modified with CdS and ZnS for sunlight-driven overall water splitting
A particulate (ZnSe)0.85(CuIn0.7Ga0.3Se2)0.15 photocathode modified with CdS and ZnS for sunlight-driven overall water splitting
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DOI：
10.1039/c7ta06663e
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发表时间：
2017-10-28
影响因子：
11.9
通讯作者：
Domen, Kazunari
中科院分区：
文献类型：
--
作者：
Goto, Yosuke;Minegishi, Tsutomu;Domen, Kazunari
用粉末状(ZnSe)(0.85)(CuIn0.7Ga0.3Se2)(0.15)光催化剂制备的光阴极在0 V-RHE下的光电流为4.3 mA cm(-2)。该光电阴极能够利用长达900 nm的光子，而起始电位高达0.8V-RHE。通过表面p-n结的形成，用薄的硫化镉和硫化锌修饰显著增加了阴极光电流。该器件在0.33V-RHE下获得了0.83%的半电池太阳能到氢的转换效率，是迄今报道的由颗粒光催化剂制成的光电阴极中最高的之一。利用这种光电阴极和BiVO4光阳极，在无偏压总分解水过程中，观察到了0.60%的太阳能到氢的转换效率。目前的工作清楚地证明了使用耐用的颗粒半导体光电极有效地产生氢气的可能性。
A photocathode prepared using the photocatalyst (ZnSe)(0.85)(CuIn0.7Ga0.3Se2)(0.15) in powder form, and modified with CdS/ZnS overlayers and a Pt catalyst, exhibits a photocurrent of 4.3 mA cm(-2) at 0 V-RHE under AM 1.5G simulated sunlight. The photocathode was capable of utilizing photons up to 900 nm, while the onset potential was evaluated to be as high as 0.8 V-RHE. Modification with thin CdS and ZnS layers significantly increases the cathodic photocurrent through the formation of a surface p-n junction. The half-cell solar-to-hydrogen conversion efficiency of 0.83% at 0.33 V-RHE obtained from this device is among the highest yet reported for a photocathode fabricated from a particulate photocatalyst. A solar to hydrogen conversion efficiency of 0.60% was observed during bias-free overall water splitting using this photocathode together with a BiVO4 photoanode. The present work clearly demonstrates the possibility of efficient hydrogen generation using durable particulate semiconductor photoelectrodes.