In present study, new strategy is employed to build composite nanostructure and asymmetric configuration to enhance the capacitive performance of supercapacitor device. The WO₃-MnO₂ composite with mesoporous structure is prepared by single-step hydrothermal method and used to gain superior electrochemical performance in asymmetric configuration. A binder-free and additive-less WO₃-MnO₂ composite electrode exhibits high specific capacitance of 609 F g⁻¹ at a scan rate of 5 mV s⁻¹. The flexible asymmetric supercapacitor device with WO₃-MnO₂ as a positive electrode and WO₃ as a negative electrode demonstrates stable operating potential window of 1.4 V with specific capacitance of 103 F g⁻¹ at a scan rate of 5 mV s⁻¹ and energy density of 24.13 Wh kg⁻¹ at power density of 915 W kg⁻¹. Furthermore, WO₃-MnO₂//WO₃ device exhibits good cycle life with capacity retention of 95% after 2500 cycles and excellent mechanical flexibility. These results reveal the potential of WO₃-MnO₂ composite electrode for fabrication of high-performance supercapacitors.

在本研究中，采用新的策略来构建复合纳米结构和不对称配置，以增强超级电容器器件的电容性能。采用一步水热法制备了具有介孔结构的WO ₃ -MnO ₂复合材料，并在不对称结构中获得了优异的电化学性能。不含粘合剂且不含添加剂的WO ₃ -MnO ₂复合电极在5 mV s ^-1的扫描速率下显示出609 F g ^-1的高比电容。以WO ₃ -MnO ₂为正极，WO ₃为正极的柔性不对称超级电容器作为负极，在1.4 mV s ^-1的扫描速率下具有103 F g ^-1的比电容，在915 W kg ^-1的功率密度下的能量密度为24.13 Wh kg ^-1，具有1.4 V的稳定工作电势窗口。此外，WO ₃ -MnO ₂ // WO ₃装置表现出良好的循环寿命，在2500次循环后容量保持率达95％，并具有出色的机械柔韧性。这些结果揭示了WO ₃ -MnO ₂复合电极在制造高性能超级电容器中的潜力。