Construction of multifunctional photoelectrochemical energy devices is of great importance to energy saving. In this study, we have successfully prepared a mesoporous WO₃ film on FTO glass via a facile dip-coating sol–gel method; the designed mesoporous WO₃ film exhibited advantages including high transparency, good adhesion and high porosity. Also, multifunctional integrated energy storage and optical modulation ability are simultaneously achieved by the mesoporous WO₃ film. Impressively, the mesoporous WO₃ film exhibits a noticeable electrochromic energy storage performance with a large optical modulation up to 75.6% at 633 nm, accompanied by energy storage with a specific capacity of 75.3 mA h g⁻¹. Furthermore, a full electrochromic energy storage window assembled with the mesoporous WO₃ anode and PANI nanoparticle cathode is demonstrated with large optical modulation and good long-term stability. Our research provides a new route to realize the coincident utilization of optical-electrochemical energy.

中文翻译：

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介孔WO ₃薄膜中增强的电致变色和能量存储性能及其在双功能智能窗口中的应用†

多功能光电化学能量装置的构建对于节能非常重要。在这项研究中，我们已经通过简便的浸涂溶胶-凝胶法成功地在FTO玻璃上制备了中孔WO ₃膜。设计的介孔WO ₃膜具有高透明度，良好的附着力和高孔隙率的优点。而且，中孔WO ₃膜同时实现了多功能的集成储能和光调制能力。令人印象深刻的是，中孔WO ₃膜具有显着的电致变色能量存储性能，在633 nm处具有高达75.6％的大光学调制，并伴随着比容量为75.3 mA hg的能量存储^-1。此外，展示了由中孔WO ₃阳极和PANI纳米颗粒阴极组装而成的完整电致变色储能窗，具有大的光学调制和良好的长期稳定性。我们的研究为实现光电化学能量的同时利用提供了一条新途径。