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<p>Photogenerated electrons generated by photoexcitation of semiconductor materials can be transferred to metal materials to provide corrosion protection. Conversely, the accumulation of photogenerated holes accelerates the recombination of photogenerated carriers. Consequently, the development of efficient strategies for the consumption of photogenerated holes has emerged as a critical challenge in the field of photoelectrochemical cathodic protection technology. In this paper, TiO<sub>2</sub>/TiOBr heterojunction photoelectrode was firstly prepared by simple hydrothermal method, and NiCo-LDH (layered double hydroxide) was further deposited on TiO<sub>2</sub>/TiOBr to obtain TiO<sub>2</sub>/TiOBr/NiCo-LDH photoelectrode. The construction of a heterojunction between TiO<sub>2</sub> and TiOBr promotes the separation of photogenerated carriers, while the deposition of NiCo-LDH reduces the overpotential for hole oxidation. Hence, the photoinduced potential drop and photoinduced current density of TiO<sub>2</sub>/TiOBr/NiCo-LDH photoelectrode coupled with 316 L stainless steel in 3.5&#xa0;wt% NaCl under simulated sunlight irradiation can be up to 303&#xa0;mV and 25.87&#xa0;μA/cm<sup>2</sup>, respectively. This study provides a new idea for the design and preparation of TiO<sub>2</sub>-based photoelectrodes with excellent photocathodic protection under visible light.</p>

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NiCo-LDH Cocatalyst-Modified TiO2/TiOBr Heterojunction for High-Efficiency Photoelectrochemical Cathodic Protection for 316L Stainless Steel

  • 期刊论文

  • 发表日期：

    2025年9月17日

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  • Zhenyu Bai,
  • Jing Tian,
  • Yang Zhou,
  • Zhenyu Zhang,
  • Zhibo Zhao,
  • Zhenxu Xu,
  • Jiarun Li

摘要

Photogenerated electrons generated by photoexcitation of semiconductor materials can be transferred to metal materials to provide corrosion protection. Conversely, the accumulation of photogenerated holes accelerates the recombination of photogenerated carriers. Consequently, the development of efficient strategies for the consumption of photogenerated holes has emerged as a critical challenge in the field of photoelectrochemical cathodic protection technology. In this paper, TiO2/TiOBr heterojunction photoelectrode was firstly prepared by simple hydrothermal method, and NiCo-LDH (layered double hydroxide) was further deposited on TiO2/TiOBr to obtain TiO2/TiOBr/NiCo-LDH photoelectrode. The construction of a heterojunction between TiO2 and TiOBr promotes the separation of photogenerated carriers, while the deposition of NiCo-LDH reduces the overpotential for hole oxidation. Hence, the photoinduced potential drop and photoinduced current density of TiO2/TiOBr/NiCo-LDH photoelectrode coupled with 316 L stainless steel in 3.5 wt% NaCl under simulated sunlight irradiation can be up to 303 mV and 25.87 μA/cm2, respectively. This study provides a new idea for the design and preparation of TiO2-based photoelectrodes with excellent photocathodic protection under visible light.