Cu2O / CuO双层复合材料作为高效光电阴极，用于光电化学氢分解反应。,Scientific Reports

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Cu2O / CuO双层复合材料作为高效光电阴极，用于光电化学氢分解反应。
Scientific Reports ( IF 3.8 ) Pub Date : 2016-10-17 , DOI: 10.1038/srep35158
Yang Yang , Di Xu , Qingyong Wu , Peng Diao

太阳能制氢反应（HER）是太阳能转化为化学能的关键反应之一。期望开发在更高的正电势下对光电化学（PEC）HER表现出高活性的光阴极材料，因为更高的电势意味着更低的HER过电势。在这项工作中，Cu ₂ O / CuO双层复合材料是通过一种简便的方法制备的，该方法涉及电沉积和随后的热氧化。所得的Cu ₂ O / CuO双层复合材料表现出令人惊讶的高活性和对PEC HER的良好稳定性，特别是在碱性溶液中的高电势下。HER的光电流密度为3.15 mA·cm ^-2相对于RHE的电位为0.40 V，这是基于氧化铜的光电阴极在相同电位下报道的两个最高电位之一。双层复合材料的高光活性归因于Cu ₂ O / CuO异质结的以下三个优点：（1）拓宽了光吸收带，从而更有效地利用了太阳能；（2）较大的空间电荷区电势可以实现高效率的电子-空穴分离，以及（3）较高的多数载流子密度，可以确保更快的电荷传输速率。这项工作揭示了Cu ₂ O / CuO双层复合材料作为有希望的用于太阳能水分解的光阴极材料的潜力。

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Cu2O/CuO Bilayered Composite as a High-Efficiency Photocathode for Photoelectrochemical Hydrogen Evolution Reaction.

Solar powered hydrogen evolution reaction (HER) is one of the key reactions in solar-to-chemical energy conversion. It is desirable to develop photocathodic materials that exhibit high activity toward photoelectrochemical (PEC) HER at more positive potentials because a higher potential means a lower overpotential for HER. In this work, the Cu₂O/CuO bilayered composites were prepared by a facile method that involved an electrodeposition and a subsequent thermal oxidation. The resulting Cu₂O/CuO bilayered composites exhibited a surprisingly high activity and good stability toward PEC HER, expecially at high potentials in alkaline solution. The photocurrent density for HER was 3.15 mA·cm^-2 at the potential of 0.40 V vs. RHE, which was one of the two highest reported at the same potential on copper-oxide-based photocathode. The high photoactivity of the bilayered composite was ascribed to the following three advantages of the Cu₂O/CuO heterojunction: (1) the broadened light absorption band that made more efficient use of solar energy, (2) the large space-charge-region potential that enabled a high efficiency for electron-hole separation, and (3) the high majority carrier density that ensured a faster charge transportation rate. This work reveals the potential of the Cu₂O/CuO bilayered composite as a promising photocathodic material for solar water splitting.

更新日期：2016-10-19

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