In this work, we conduct a detailed study to understand the photoelectrochromic properties of Al-Pt co-doped tungsten oxide (WO). Similarly, we support the photoelectrochromic findings with material characterization, providing additional understanding of the photoelectrochromic performance exhibited by the prepared samples. Additionally, we discuss the effects of Al and Pt doping on photoelectrochromic performance in detail, with a focus on X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) combined with EDS, X-ray photoelectron spectroscopy (XPS), and optical transmittance. XRD peaks confirm the presence of hexagonally-structured WO in the prepared samples with a polycrystalline nature, and a similar observation is confirmed via TEM analysis. Surface characterizations conducted through SEM and EDS analyses unveil the morphologies and particle sizes. Optical studies show a bandgap of 1.88 eV and 1.95 eV for Al doped and Al-Pt co-doped WO, indicating bandgap shrinkage in comparison to the optical bandgap of WO of 2.36 eV. The Al-Pt co-doping results in a significant enhancement in photoelectrochromic performance, attaining an optical modulation of 43.61 % at 550 nm and consequently 85 % of the initial transmittance recovered after 2 h of bleaching in the dark. This is an improvement in comparison to the Al doped sample which attains a coloration depth of 43.15 % at 550 nm with only 75 % of the original transmittance being recovered after 2 h under dark conditions.

中文翻译：

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WO3与Al、Pt共掺杂对光电致变色性能的协同作用


在这项工作中，我们进行了详细的研究，以了解 Al-Pt 共掺杂氧化钨 (WO) 的光电致变色性能。同样，我们通过材料表征支持光电致变色的发现，提供对所制备的样品所表现出的光电致变色性能的额外理解。此外，我们还详细讨论了Al和Pt掺杂对光电致变色性能的影响，重点是X射线衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）结合EDS、X射线光电子显微镜光谱（XPS）和光学透射率。 XRD 峰证实了所制备的具有多晶性质的样品中存在六方结构的 WO，并且通过 TEM 分析也证实了类似的观察结果。通过 SEM 和 EDS 分析进行的表面表征揭示了形态和颗粒尺寸。光学研究表明，Al 掺杂和 Al-Pt 共掺杂 WO 的带隙为 1.88 eV 和 1.95 eV，这表明与 WO 的光学带隙 2.36 eV 相比，带隙有所缩小。 Al-Pt 共掺杂导致光电致变色性能显着增强，在 550 nm 处实现了 43.61% 的光学调制，因此在黑暗中漂白 2 小时后恢复了初始透射率的 85%。与掺铝样品相比，这是一个改进，掺铝样品在 550 nm 处的着色深度为 43.15%，在黑暗条件下 2 小时后仅恢复了原始透射率的 75%。