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<p>InGaN is a promising photocatalytic material with excellent and tunable optical properties. However, the effect of modifying InGaN thin films with various modifier layers on photocatalytic CO<sub>2</sub> reduction remains underexplored. In this work, we systematically investigated the impact of g-C<sub>3</sub>N<sub>4</sub>, TiO<sub>2</sub>, and their bilayer combination on the photocatalytic performance of InGaN photoanodes. The simultaneous loading of g-C<sub>3</sub>N<sub>4</sub> and TiO<sub>2</sub> onto InGaN yielded the most significant enhancement. This configuration resulted in a CO<sub>2</sub>-to-CO conversion rate of 4.725&#xa0;µmol·mol⁻<sup>1</sup>, which is 2.35 times higher than that of bare InGaN (2.006&#xa0;µmol·mol<sup>−1</sup>). Furthermore, the production of H<sub>2</sub> and hydrocarbons was also augmented. Electrochemical and spectroscopic analyses revealed that the bilayer structure synergistically combines the high light-harvesting capability of TiO<sub>2</sub> with the improved CO<sub>2</sub> reduction selectivity of g-C<sub>3</sub>N<sub>4</sub>, while also mitigating photocorrosion. This work demonstrates that constructing hybrid modifier layers is an effective strategy for boosting the activity and stability of InGaN-based photocatalysts for CO<sub>2</sub> reduction.</p>

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Enhancement of photocatalytic CO2 reduction in InGaN thin films by different kinds of modifier layers

  • 期刊论文

  • 发表日期：

    2025年11月14日

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  • Wei Sun,
  • Hui Zhang,
  • Mingxia Di,
  • Nan Gao,
  • Xinjian Xie,
  • Lifeng Bian,
  • Yulong Fang,
  • Guifeng Chen

摘要

InGaN is a promising photocatalytic material with excellent and tunable optical properties. However, the effect of modifying InGaN thin films with various modifier layers on photocatalytic CO2 reduction remains underexplored. In this work, we systematically investigated the impact of g-C3N4, TiO2, and their bilayer combination on the photocatalytic performance of InGaN photoanodes. The simultaneous loading of g-C3N4 and TiO2 onto InGaN yielded the most significant enhancement. This configuration resulted in a CO2-to-CO conversion rate of 4.725 µmol·mol⁻1, which is 2.35 times higher than that of bare InGaN (2.006 µmol·mol−1). Furthermore, the production of H2 and hydrocarbons was also augmented. Electrochemical and spectroscopic analyses revealed that the bilayer structure synergistically combines the high light-harvesting capability of TiO2 with the improved CO2 reduction selectivity of g-C3N4, while also mitigating photocorrosion. This work demonstrates that constructing hybrid modifier layers is an effective strategy for boosting the activity and stability of InGaN-based photocatalysts for CO2 reduction.