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<p>The photocatalytic production of hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) through solar energy represents a sustainable, safe, and cost-effective approach. In this work, polyimide<b>/</b>In<sub>2</sub>S<sub>3</sub> (PI/In<sub>2</sub>S<sub>3</sub>) type II heterojunction photocatalysts were fabricated successfully by using a hydrothermal method. The tight interface established between PI and In<sub>2</sub>S<sub>3</sub> boosted the separation and transfer of photogenerated charge carriers. The photocatalytic H<sub>2</sub>O<sub>2</sub> production rate of the PI/In<sub>2</sub>S<sub>3</sub>-2 sample with the PI to In<sub>2</sub>S<sub>3</sub> mass ratio of 2:1 was as high as 378.48&#xa0;µmol&#xa0;g<sup>−1</sup>&#xa0;h<sup>−1</sup> under visible-light irradiation, which was 12.4 and 12.2 folds higher than pristine PI and In<sub>2</sub>S<sub>3</sub>, respectively. After five cycles of the experiment, the yield of H<sub>2</sub>O<sub>2</sub> remained at 80% of that obtained in the first cycle. The active species trapping experiments indicated that electrons (e<sup>−</sup>) and superoxide radicals (·O<sub>2</sub><sup>−</sup>) were the main species. These species participated in a two-step one-electron reduction process that converted&#xa0;O<sub>2</sub> into ·O<sub>2</sub><sup>−</sup> and&#xa0;subsequently led to the formation of H<sub>2</sub>O<sub>2</sub>. This work presents new insights into the construction of stable and efficient organic polymer/metal sulfide heterojunction photocatalysts.</p>

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Highly efficient photocatalytic production of H2O2 by polyimide/In2S3 heterostructures under visible-light irradiation

  • 期刊论文

  • 发表日期：

    2025年5月29日

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  • Menglin Wang,
  • Yulong Xiang,
  • Xiaoli Dong,
  • Yu Wang

摘要

The photocatalytic production of hydrogen peroxide (H2O2) through solar energy represents a sustainable, safe, and cost-effective approach. In this work, polyimide/In2S3 (PI/In2S3) type II heterojunction photocatalysts were fabricated successfully by using a hydrothermal method. The tight interface established between PI and In2S3 boosted the separation and transfer of photogenerated charge carriers. The photocatalytic H2O2 production rate of the PI/In2S3-2 sample with the PI to In2S3 mass ratio of 2:1 was as high as 378.48 µmol g−1 h−1 under visible-light irradiation, which was 12.4 and 12.2 folds higher than pristine PI and In2S3, respectively. After five cycles of the experiment, the yield of H2O2 remained at 80% of that obtained in the first cycle. The active species trapping experiments indicated that electrons (e−) and superoxide radicals (·O2−) were the main species. These species participated in a two-step one-electron reduction process that converted O2 into ·O2− and subsequently led to the formation of H2O2. This work presents new insights into the construction of stable and efficient organic polymer/metal sulfide heterojunction photocatalysts.