通过调整用于光电化学水分解的 CuO 厚度来表征 Cu2O/CuO 异质结光阴极,RSC Advances

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通过调整用于光电化学水分解的 CuO 厚度来表征 Cu2O/CuO 异质结光阴极
RSC Advances ( IF 3.9 ) Pub Date : 2022-01-20 , DOI: 10.1039/d1ra08863g
Dasol Jeong ₁ , Woohyeon Jo _{1,

2} , Jaebum Jeong ₁ , Taegeon Kim _{1,

3} , Seungyeon Han _{1,

2} , Min-Kyu Son ₁ , Hyunsung Jung ₁

Affiliation

Cu ₂ O/CuO异质结构是一种众所周知的提高Cu ₂ O光阴极光电化学(PEC)水分解性能的策略。_{Cu 2} O/CuO异质结构中的CuO厚度被认为是影响PEC性能的关键因素，因为它与光利用和电荷分离/传输高度相关。在这项研究中，研究了定制 CuO 厚度的 Cu ₂ O/CuO 光电阴极，以检查 CuO 厚度对 PEC 性能的影响。通过电沉积和随后的热退火工艺制备Cu _{2 O/CuO 光电阴极，Cu}₂O / CuO异质结构由退火温度和时间控制。结果表明，增加的 CuO 厚度增强了长波长区域的光吸收，并通过增强的带弯曲改善了电荷分离。然而，厚的CuO阻碍了Cu ₂ O/CuO异质结构中的有效电荷传输，导致PEC性能下降。因此，有必要优化CuO厚度以增强Cu ₂ O/CuO光电阴极的PEC性能。因此，通过在 350 °C 下退火 20 分钟制造了由具有相似的 CuO 厚度和少数载流子扩散长度（~90 nm）组成的 Cu _{2 O/CuO 光电阴极，它显示出最佳的 PEC 性能（-1.2 mA cm}^-2在 0 V vs. RHE）在 pH 6.5 的水溶液中，这是由于增强的光利用率和增强的带弯曲。

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Characterization of Cu2O/CuO heterostructure photocathode by tailoring CuO thickness for photoelectrochemical water splitting

Cu₂O/CuO heterostructure is a well-known strategy to improve the performance of Cu₂O photocathodes for photoelectrochemical (PEC) water splitting. The CuO thickness in the Cu₂O/CuO heterostructure is considered as a critical factor affecting the PEC performance because it is highly related to the light utilization and charge separation/transport. In this study, the Cu₂O/CuO photocathode tailoring the CuO thickness was investigated to examine the CuO thickness influence on the PEC performance. Cu₂O/CuO photocathodes were prepared by the electrodeposition and subsequent thermal annealing process and the Cu₂O/CuO heterostructure was controlled by the annealing temperature and time. It was demonstrated that the increased CuO thickness enhances the light absorption in the long wavelength region and improves the charge separation by the reinforced band bending. However, the thick CuO hinders the efficient charge transport in the Cu₂O/CuO heterostructure, resulting in the decreased PEC performance. Therefore, it is necessary to optimize the CuO thickness for the enhanced PEC performance of Cu₂O/CuO photocathodes. Consequently, the Cu₂O/CuO photocathode consisting of the similar CuO thickness with its minority carrier diffusion length (∼90 nm) was fabricated by annealing at 350 °C for 20 min, and it shows the optimal PEC performance (−1.2 mA cm⁻² at 0 V vs. RHE) in pH 6.5 aqueous solution, resulting from the enhanced light utilization and the reinforced band bending.

更新日期：2022-01-20

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