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<p>Electrochromic materials undergo reversible color changes through redox reactions involving the insertion and extraction of electrons and ions under an applied electric field. In this study, we systematically investigate the photo-assisted electrochromic behavior of Bi<sub>2</sub>O<sub>2</sub>Se nanosheets, which exhibit a color transition from gray to yellow under light modulation. Bi<sub>2</sub>O<sub>2</sub>Se nanosheets were successfully synthesized via a hydrothermal method and characterized in a three-electrode system using photoelectrochemical measurements. During the tests, an external bias of 0.6&#xa0;V was applied while the samples were illuminated with monochromatic light in the wavelength range of 400–650&#xa0;nm. The results show that illumination across this wavelength range can promote the coloration process.Upon further reducing the applied voltage, it is found that shorter-wavelength light effectively lowers the threshold voltage for electrochromic switching, exhibiting a nonlinear increase in threshold voltage with increasing incident wavelength. Compared with white-light illumination, the coloration process under monochromatic light is slower and mainly results in partial coloration. The colored samples were subsequently discharged at 0&#xa0;V, during which the electrode color gradually recovered, and the photocurrent returned to approximately 0.42 µA cm⁻<sup>2</sup>, close to its initial value. These results indicate that the system exhibits a certain degree of reversibility in both electrochromic behavior and electrochemical function.Overall, the findings demonstrate that photon energy can modulate the threshold voltage and kinetics of electrochromic processes in Bi<sub>2</sub>O<sub>2</sub>Se nanosheets, providing new experimental insights and potential applications for photo-responsive electrochromic devices.</p>

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Photo-assisted modulation of the coloration behavior of Bi2O2Se nanosheets

  • 期刊论文

  • 发表日期：

    2026年5月19日

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  • Zehao Wei,
  • Jing Liu,
  • Xihe Wang,
  • Jun Li

摘要

Electrochromic materials undergo reversible color changes through redox reactions involving the insertion and extraction of electrons and ions under an applied electric field. In this study, we systematically investigate the photo-assisted electrochromic behavior of Bi2O2Se nanosheets, which exhibit a color transition from gray to yellow under light modulation. Bi2O2Se nanosheets were successfully synthesized via a hydrothermal method and characterized in a three-electrode system using photoelectrochemical measurements. During the tests, an external bias of 0.6 V was applied while the samples were illuminated with monochromatic light in the wavelength range of 400–650 nm. The results show that illumination across this wavelength range can promote the coloration process.Upon further reducing the applied voltage, it is found that shorter-wavelength light effectively lowers the threshold voltage for electrochromic switching, exhibiting a nonlinear increase in threshold voltage with increasing incident wavelength. Compared with white-light illumination, the coloration process under monochromatic light is slower and mainly results in partial coloration. The colored samples were subsequently discharged at 0 V, during which the electrode color gradually recovered, and the photocurrent returned to approximately 0.42 µA cm⁻2, close to its initial value. These results indicate that the system exhibits a certain degree of reversibility in both electrochromic behavior and electrochemical function.Overall, the findings demonstrate that photon energy can modulate the threshold voltage and kinetics of electrochromic processes in Bi2O2Se nanosheets, providing new experimental insights and potential applications for photo-responsive electrochromic devices.