Scholarlink

<p>In this study, gradient and non-gradient CuO photoelectrodes were fabricated using a spike-chemical bath deposition (S-CBD) process. Their morphological, structural, optical, and electrical properties were systematically compared to investigate the effect of the gradient structure on the photoelectrochemical (PEC) performance. The S-CBD process enabled arbitrary variation of the precursor solution concentration during deposition, allowing the fabrication of a gradient CuO photoelectrode with gradually varying Cu concentration. The near-linear change in precursor concentration during deposition was confirmed by monitoring the pH variation of the injected precursor solution. The gradient structure of the resulting CuO photoelectrodes was verified by X-ray photoelectron spectroscopy (XPS) depth profiling. The optimized gradient CuO photoelectrode exhibited a photocurrent density of 2.48&#xa0;mA/cm<sup>2</sup> at -0.55 V<sub>SCE</sub>, representing approximately 31% enhancement compared to the non-gradient CuO photoelectrode (1.89&#xa0;mA/cm<sup>2</sup>). Moreover, the S-CBD gradient CuO photoelectrode demonstrated superior crystallinity, lower resistance at the photoelectrode–electrolyte interface, and higher flat-band potential than the non-gradient counterpart. Finally, deposition of a NiO<sub>x</sub> capping layer enhanced the photostability of the CuO photoelectrode by 37.8%.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Dopant-free gradient-structured CuO photoelectrodes via spike-chemical bath deposition for enhanced photoelectrochemical performance

  • 期刊论文

  • 发表日期：

    2026年7月7日

查看全文
  • Jin Kyeong Kim,
  • Hyukhyun Ryu

摘要

In this study, gradient and non-gradient CuO photoelectrodes were fabricated using a spike-chemical bath deposition (S-CBD) process. Their morphological, structural, optical, and electrical properties were systematically compared to investigate the effect of the gradient structure on the photoelectrochemical (PEC) performance. The S-CBD process enabled arbitrary variation of the precursor solution concentration during deposition, allowing the fabrication of a gradient CuO photoelectrode with gradually varying Cu concentration. The near-linear change in precursor concentration during deposition was confirmed by monitoring the pH variation of the injected precursor solution. The gradient structure of the resulting CuO photoelectrodes was verified by X-ray photoelectron spectroscopy (XPS) depth profiling. The optimized gradient CuO photoelectrode exhibited a photocurrent density of 2.48 mA/cm2 at -0.55 VSCE, representing approximately 31% enhancement compared to the non-gradient CuO photoelectrode (1.89 mA/cm2). Moreover, the S-CBD gradient CuO photoelectrode demonstrated superior crystallinity, lower resistance at the photoelectrode–electrolyte interface, and higher flat-band potential than the non-gradient counterpart. Finally, deposition of a NiOx capping layer enhanced the photostability of the CuO photoelectrode by 37.8%.