Hydrogen evolution from water using Ag(x)Cu(1-x)GaSe2 photocathodes under visible light.
Hydrogen evolution from water using Ag(x)Cu(1-x)GaSe2 photocathodes under visible light.
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DOI：
10.1039/c3cp54590c
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发表时间：
2014-03
期刊：
影响因子：
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通讯作者：
Li Zhang;T. Minegishi;J. Kubota;K. Domen
中科院分区：
文献类型：
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作者：
Li Zhang;T. Minegishi;J. Kubota;K. Domen
研究了使用用银部分取代铜修饰的 CuGaSe2 (CGSe) 薄膜光阴极进行光电化学 (PEC) 水分解。使用分子束外延 (MBE) 系统通过共蒸发将 AgxCu1-xGaSe2 (ACGSe) 薄膜沉积到涂有 Mo 的钠钙玻璃基板上。 ACGSe的价带最大(VBM)势比CGSe更深，并且其晶粒尺寸比CGSe大大增加。 Ag/(Cu+Ag)比约为5%的Pt和CdS修饰的ACGSe电极(Pt/CdS/ACGSe)在0.1 M Na2SO4溶液(pH 9.5）。此外，Pt/CdS/ACGSe 表现出稳定的阴极光电流超过 55 小时，没有明显下降。
Photoelectrochemical (PEC) water splitting using CuGaSe2 (CGSe) thin film photocathodes modified by partial substitution of Cu with Ag was investigated. The AgxCu1-xGaSe2 (ACGSe) thin films were deposited onto Mo-coated soda-lime glass substrates by means of co-evaporation using a molecular beam epitaxy (MBE) system. The valence band maximum (VBM) potential of ACGSe is deeper than that of CGSe, and its grain size is greatly increased compared to that of CGSe. A Pt and CdS modified ACGSe electrode (Pt/CdS/ACGSe) with a Ag/(Cu + Ag) ratio of about 5% showed a cathodic photocurrent of 8.1 mA cm(-2) at 0 VRHE and an onset potential of 0.70 VRHE (defined as a cathodic photocurrent of 0.05 mA cm(-2)) under simulated sunlight in a 0.1 M Na2SO4 solution (pH 9.5). Moreover, Pt/CdS/ACGSe exhibited a stable cathodic photocurrent for over 55 h, with no clear decrease.