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<p>Vacancy defects can result in visible imperfections in the material’s lattice structure; however, they also enhance its effectiveness in various applications. In the present study, we have experimentally investigated how vacancy defects influence the electrochromic properties. This study presents a comparative analysis of the electrochromic (EC) properties of V₂O₅ thin films synthesized using ammonium metavanadate (NH<sub>4</sub>VO<sub>2</sub>) and commercially available V<sub>2</sub>O<sub>5</sub> via a hydrothermal approach. Structural and morphological analyses were performed to confirm the formation of a microporous network and a nanosheet of V<sub>2</sub>O<sub>5</sub> nanomaterials. Furthermore, X-ray photoelectron spectroscopy (XPS) was employed to investigate oxygen vacancies in V<sub>2</sub>O<sub>5</sub> films. The cyclic voltammetry (CV) and in-situ optical variation results highlighted the positive impact of oxygen vacancies on the EC performance. The maximum coloration efficiency of multicolored V<sub>2</sub>O<sub>5</sub>-N thin films were 96.23&#xa0;cm<sup>2</sup> C<sup>−1</sup> at a 633&#xa0;nm wavelength, with 500 color/bleach cycles in 0.5&#xa0;M LiClO<sub>4</sub> + PC electrolytes. The microporous network and nanosheet morphology of V<sub>2</sub>O<sub>5</sub> thin films exhibited distinct optical hues with excellent long-term EC cycling stability. The high coloration efficiency (CE) and EC stability of V<sub>2</sub>O<sub>5</sub> thin films prepared using NH<sub>4</sub>VO<sub>2</sub> demonstrate the significant impact of oxygen defects.</p>

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Vacancy-defect assisted electrochromic applications in V2O5 nanomaterials

  • 期刊论文

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  • 发表日期：

    2025年9月2日

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  • Bhalchandra K. Mandlekar,
  • Amar L. Jadhav,
  • Ashwini Pol,
  • Anamika V. Kadam

摘要

Vacancy defects can result in visible imperfections in the material’s lattice structure; however, they also enhance its effectiveness in various applications. In the present study, we have experimentally investigated how vacancy defects influence the electrochromic properties. This study presents a comparative analysis of the electrochromic (EC) properties of V₂O₅ thin films synthesized using ammonium metavanadate (NH4VO2) and commercially available V2O5 via a hydrothermal approach. Structural and morphological analyses were performed to confirm the formation of a microporous network and a nanosheet of V2O5 nanomaterials. Furthermore, X-ray photoelectron spectroscopy (XPS) was employed to investigate oxygen vacancies in V2O5 films. The cyclic voltammetry (CV) and in-situ optical variation results highlighted the positive impact of oxygen vacancies on the EC performance. The maximum coloration efficiency of multicolored V2O5-N thin films were 96.23 cm2 C−1 at a 633 nm wavelength, with 500 color/bleach cycles in 0.5 M LiClO4 + PC electrolytes. The microporous network and nanosheet morphology of V2O5 thin films exhibited distinct optical hues with excellent long-term EC cycling stability. The high coloration efficiency (CE) and EC stability of V2O5 thin films prepared using NH4VO2 demonstrate the significant impact of oxygen defects.