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<p>Given the increasing interest in converting CO<sub>2</sub> into clean energy through photocatalytic processes, a Bi<sub>4</sub>O<sub>5</sub>Br<sub>2</sub>/Bi<sub>2</sub>WO<sub>6</sub> heterojunction photocatalyst was successfully constructed via a hydrothermal process combined with an in situ growth technique for efficient CO<sub>2</sub> photoreduction. Without sacrificial agents, the composite material 20Bi<sub>4</sub>O<sub>5</sub>Br<sub>2</sub>/Bi<sub>2</sub>WO<sub>6</sub> (20BOB/BWO) demonstrated superior photocatalytic activity. The generation rates of CO and CH<sub>4</sub> reached 25&#xa0;µmol·g<sup>−1</sup>·h<sup>−1</sup> and 4.6&#xa0;µmol·g<sup>−1</sup>·h<sup>−1</sup>, respectively; notably, the CO yield was significantly higher than that of pure Bi<sub>4</sub>O<sub>5</sub>Br<sub>2</sub> and Bi<sub>2</sub>WO<sub>6</sub>. Such enhancement originated from the type-II interfacial charge transfer mechanism, which facilitated efficient spatial charge separation and consequently led to a remarkable improvement in the composite’s catalytic efficiency.</p>

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Construction of flower sphere Bi4O5Br2/Bi2WO6 heterojunction for highly selective CO evolution in photocatalytic CO2 reduction without sacrificial reagents

  • 期刊论文

  • 发表日期：

    2026年6月18日

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  • Xueqin Zhou,
  • Fengjun Zhang

摘要

Given the increasing interest in converting CO2 into clean energy through photocatalytic processes, a Bi4O5Br2/Bi2WO6 heterojunction photocatalyst was successfully constructed via a hydrothermal process combined with an in situ growth technique for efficient CO2 photoreduction. Without sacrificial agents, the composite material 20Bi4O5Br2/Bi2WO6 (20BOB/BWO) demonstrated superior photocatalytic activity. The generation rates of CO and CH4 reached 25 µmol·g−1·h−1 and 4.6 µmol·g−1·h−1, respectively; notably, the CO yield was significantly higher than that of pure Bi4O5Br2 and Bi2WO6. Such enhancement originated from the type-II interfacial charge transfer mechanism, which facilitated efficient spatial charge separation and consequently led to a remarkable improvement in the composite’s catalytic efficiency.