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NiOx nanoparticles as active water splitting catalysts for the improved photostability of a n-GaN photoanode
Solar Energy Materials and Solar Cells ( IF 6.3 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.solmat.2020.110723
Huang-Kai Wang , Sakthivel Kogularasu , Po-Hsun Liao , Yu-Tsun Yao , Ming-Lun Lee , Jinn-Kong Sheu

Abstract In this article, we propose a scheme using the conformal coating of p-NiOx nanoparticles on the n-GaN photoanode to prevent the photoelectrodes from corrosion and thereby enhance conversion efficiency. Furthermore, the various weight ratios of NiOx (1:5 and 3:2) are explored to optimize the study. NiOx nanoparticles avoid corrosion on the n-GaN surface, decrease the solar water-splitting reaction overpotential, and enhance the photocurrent density at a working electrode applied bias of 1 V in the two-electrode system. Finally, in the stability test, the hydrogen evolution rate of NiOx (3:2) is more effective than that of pristine n-GaN even after 5 h. These results indicate that NiOx nanoparticle-decorated n-GaN gains higher photostability and hydrogen production performance in PEC cells.

中文翻译:

NiOx 纳米粒子作为活性水分解催化剂提高 n-GaN 光阳极的光稳定性

摘要 在本文中,我们提出了一种方案,在 n-GaN 光阳极上使用 p-NiOx 纳米颗粒的保形涂层来防止光电极腐蚀,从而提高转换效率。此外,探索了 NiOx 的各种重量比(1:5 和 3:2)以优化研究。NiOx 纳米粒子避免了 n-GaN 表面的腐蚀,降低了太阳能水分解反应的过电位,并提高了双电极系统中工作电极施加 1 V 偏压的光电流密度。最后,在稳定性测试中,即使在 5 小时后,NiOx (3:2) 的析氢率也比原始 n-GaN 的析氢率更有效。这些结果表明,NiOx 纳米颗粒装饰的 n-GaN 在 PEC 电池中获得了更高的光稳定性和产氢性能。
更新日期:2020-10-01
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