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<p>BiVO<sub>4</sub> (BVO) is widely utilized in photothermal catalysis because of its favorable bandgap structure (2.4 eV), excellent photo response capabilities and high thermal stability. However, the mechanism of BVO photothermal corrosion still remains unclear due to the lack of visualized characterization on the degradation process in real time. Herein, we directly unveil the photothermal-induced microstructural evolution of BVO through <i>in-situ</i> heating (scanning) transmission electron microscopy [(S)TEM]. The results indicate that the electrons are the initiating condition (“switch”) for the photothermal corrosion of BVO, resulting in the precipitation of Bi and reduction of V<sup>5+</sup> to V<sup>3+</sup> in the substrate, while the thermal field facilitates the evaporation of Bi and the recrystallization of V<sub>2</sub>O<sub>3</sub>. This work sheds light on the mechanism of BVO photothermal corrosion in dynamics and provides significant insights into the photothermal synergistic effects.</p>

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Directly Unveiling the Photothermal Corrosion of BiVO4 via In-situ Transmission Electron Microscopy

  • 期刊论文

  • 发表日期：

    2025年3月7日

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  • Lindong Wang,
  • Jingyi Sun,
  • Lang Wang,
  • Yu Li,
  • Zhiyi Hu,
  • Baolian Su

摘要

BiVO4 (BVO) is widely utilized in photothermal catalysis because of its favorable bandgap structure (2.4 eV), excellent photo response capabilities and high thermal stability. However, the mechanism of BVO photothermal corrosion still remains unclear due to the lack of visualized characterization on the degradation process in real time. Herein, we directly unveil the photothermal-induced microstructural evolution of BVO through in-situ heating (scanning) transmission electron microscopy [(S)TEM]. The results indicate that the electrons are the initiating condition (“switch”) for the photothermal corrosion of BVO, resulting in the precipitation of Bi and reduction of V5+ to V3+ in the substrate, while the thermal field facilitates the evaporation of Bi and the recrystallization of V2O3. This work sheds light on the mechanism of BVO photothermal corrosion in dynamics and provides significant insights into the photothermal synergistic effects.