Electrochromic (EC) windows with controllable transmittances according to ambient temperature and solar irradiation strength are highly desired for energy‐efficient buildings. However, traditional EC windows operate via consuming electrical energy to trigger the chromogenic reactions, with negligible energy storage ability. Herein, a facile battery‐type Prussian blue (PB, Fe₄^III[Fe^II(CN)₆]₃)/Zn EC window with excellent EC properties (transmittance modulation = 84.9% at 633 nm), remarkable energy storage ability (average output voltage = 1.24 V and areal capacity = 78.9 mAh m⁻²), fast switching time (t_bleaching = 4.1 s and t_coloring = 4.6 s), as well as an ultralong cycling lifetime (7000 cycles with 60.7% capacity retention and 92.7% transmittance modulation retention) is reported, thanks to the rational electrode and electrolyte design. As an EC window, this device can effectively promote energy efficiency and occupational comfort of buildings by regulating visible light transmittance. As a battery, this device can work as backup power or a component of smart grids, making the buildings more sustainable and functional. The design concept of this bifunctional device is helpful to further the development of next‐generation EC windows.

中文翻译：

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具有显着储能能力的长寿命电池型电致变色窗

节能建筑迫切需要根据环境温度和太阳辐射强度具有可控透射率的电致变色（EC）窗户。但是，传统的EC窗口通过消耗电能来触发发色反应，而储能能力却微不足道。此处，一种易用的电池型普鲁士蓝（PB，Fe ₄ ^III [Fe ^II（CN）₆ ] ₃）/ Zn EC窗，具有出色的EC特性（在633 nm处的透射率调制= 84.9％），出色的能量存储能力（平均输出电压= 1.24 V和面容量= 78.9 mAh m ^-2），快速切换时间（t_漂白 = 4.1 s和t_着色 由于采用了合理的电极和电解质设计，因此报告了= 4.6 s）以及超长的循环寿命（7000个循环，具有60.7％的容量保持率和92.7％的透射率调制保持率）。作为EC窗户，此设备可通过调节可见光透射率来有效地提高建筑物的能源效率和职业舒适度。作为电池，该设备可以用作备用电源或智能电网的一部分，使建筑物更具可持续性和功能性。该双功能设备的设计概念有助于进一步开发下一代EC窗口。