High-performance complementary electrochromic energy storage device based on tungsten trioxide and manganese dioxide films

Zhao, Lili; Chen, Zuoming; Peng, YuQin; Yang, Lilin; Ai, Jingting; Zhou, Jianhua; Miao, Lei

High-performance complementary electrochromic energy storage device based on tungsten trioxide and manganese dioxide films

2022

In this work, we have selected a representative pseudocapacitive material of manganese dioxide (MnO₂) film as the complementing electrode of tungsten trioxide (WO₃) film to construct a smart electrochromic energy storage device (EESD), with the aim to simultaneously provide the optical modulation and energy storage performance. WO₃ and MnO₂ films have been respectively synthesized via simple hydrothermal and electrodeposition methods to achieve desirable matched performance. For the constructed EESD, an obvious optical contrast (38.63% at 633 nm), fast switching times (tb/tc = 9.37/5.19 s), high coloration efficiency (85.36 cm²·C⁻¹), satisfactory specific capacitance (10.69 mF·cm⁻² at the discharge current density of 0.1 mA·cm⁻²) as well as excellent cycle stability (initial capacitance retention rate of 95.90% after 1000 charge/discharge cycles) have been derived. After charging, the obtained EESD could light up an LED bulb or an LCD screen, showing high promising application prospect in energy storage.

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