Photoelectrochemical (PEC) water splitting using a cell composed of a photocathode and photoanode is an attractive approach to producing hydrogen utilizing solar energy. Photocathodes based on nonoxide materials exhibit high solar‐to‐hydrogen conversion efficiencies thanks to their narrow bandgaps. However, the corrosion of photocathode surfaces at oxidative potentials and under highly alkaline conditions has resulted in insufficient durability. Here, the PEC properties of near‐infrared‐sensitive (ZnSe)_0.85(CuIn_0.7Ga_0.3Se₂)_0.15‐based photocathodes coated with a RuO₂ nanolayer using a photo‐electrodeposition method are investigated under harsh conditions. A RuO₂‐coated (ZnSe)_0.85(CuIn_0.7Ga_0.3Se₂)_0.15 photocathode exhibits no degradation during the PEC hydrogen evolution reaction (HER) at 0.6 V_RHE for longer than 10 h in electrolytes having pH values of 7 or 13. Maximum photocurrents of 9.1 and 2.9 mA cm⁻² are obtained at 0 and 0.6 V_RHE, respectively, under simulated sunlight without the use of any other HER catalyst or a conductor layer. This study therefore demonstrates a useful method for the fabrication of efficient, durable PEC cells using nonoxide photocathodes.

中文翻译：

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在苛刻条件下在近红外响应光电阴极上由水稳定地产生氢气

使用由光电阴极和光电阳极组成的电池进行光电化学（PEC）水分解是利用太阳能生产氢的一种有吸引力的方法。基于非氧化物材料的光电阴极具有窄的带隙，因此具有很高的太阳能转化效率。然而，光阴极表面在氧化电势下和在高碱性条件下的腐蚀导致耐久性不足。在这里，在苛刻的条件下研究了用RuO ₂纳米层涂覆的近红外敏感（ZnSe）_0.85（CuIn _0.7 Ga _0.3 Se ₂）_0.15系光电阴极的PEC特性。RuO ₂涂有涂层（ZnSe）_0.85（CuIn _0.7 Ga _0.3 Se ₂）_0.15的光电阴极在pH值为7或13的电解质中于0.6 V _RHE下进行PEC析氢反应（HER）超过10 h时，不会发生降解。在模拟阳光下，不使用任何其他HER催化剂或导体层的情况下，分别在0和0.6 V _RHE下获得9.1和2.9 mA cm ^-2。因此，这项研究证明了使用非氧化物光电阴极制造高效，耐用的PEC电池的有用方法。