Flexible supercapacitors with aqueous electrolytes are attractive safe power sources; yet low specific capacitance and narrow operating voltage hinder their practical applications. Herein, we deposit arrays of TiO₂ nanowires (TiO₂@CC) and MnO₂ nanosheets (MnO₂@CC) on carbon cloth via a solution-based technique at 80 °C and in an open atmosphere. The TiO₂ nanowires possess intrinsic low hydrogen evolution reaction activities and in turn a wide working window (−1.6–0 V vs. Hg/HgO). The high specific surface area and favorable pore texture endow the TiO₂@CC and the MnO₂@CC with high areal specific capacitances of 1204.8 mF cm⁻² and 1427.2 mF cm⁻², respectively. A 2.6 V wide potential window aqueous asymmetric supercapacitor is then constructed, which exhibits an exceptional high specific capacitance of 1010.8 mF cm⁻², high volumetric energy density of 4.75 mW h cm⁻³ and volumetric power density of 325 mW cm⁻³. The areal energy density and areal power density are 0.949 mW h cm⁻² and 65 mW cm⁻², respectively. The excellent cyclic stability of 100% capacity retention after 50,000 cycles at a high current density of 5 mA cm⁻² is recorded and the supercapacitor also exhibits good flexibility.

具有水性电解质的柔性超级电容器是有吸引力的安全电源。然而低的比电容和狭窄的工作电压阻碍了它们的实际应用。在这里，我们通过基于溶液的技术在80°C和开放的气氛中在碳布上沉积TiO ₂纳米线（TiO ₂ @CC）和MnO ₂纳米片（MnO ₂ @CC）的阵列。TiO ₂纳米线具有固有的低氢放出反应活性，进而具有较宽的工作窗口（−1.6–0 V对Hg / HgO）。高的比表面积和良好的孔结构赋予TiO ₂ @CC和MnO ₂ @CC较高的面积比电容1204.8 mF cm ^-2和1427.2 mF cm ^-2。然后构建了2.6 V宽电位窗水性不对称超级电容器，该电容器表现出1010.8 mF cm ^-2的出色高比电容，4.75 mW h cm ^-3的高体积能量密度和325 mW cm ^-3的体积功率密度。面能量密度和面功率密度分别为0.949 mW h cm ^-2和65 mW cm ^-2。记录了在5 mA cm ^-2的高电流密度下50,000次循环后100％容量保持率的出色循环稳定性，并且超级电容器也显示出良好的柔韧性。