Aqueous energy storage systems show great promise because of their merits of high safety, low cost and environmentally friendliness. Huge efforts, in recent years, have been focused on these systems employing metal cations as charge carriers. In aqueous rechargeable batteries, a paradigm shift has recently moved to nonmetal ions as charge carriers (e.g.: H⁺, NH₄⁺). Herein, we report an ammonium vanadium oxide framework (NVO) displaying excellent NH₄⁺ storages. The capacitance and cycle performance of NVO are greatly improved using NH₄Cl/PVA gel electrolyte. In three-electrode configuration, at 0.5 A g⁻¹, the NVO electrode delivers a specific capacitance of 339 F·g⁻¹ (610 C·g⁻¹, 169 mAh·g⁻¹) in NH₄Cl/PVA electrolyte, which is much higher than the value of 268 F·g⁻¹ (483 C·g⁻¹, 134 mAh·g⁻¹) in NH₄Cl electrolyte. It shows 71% capacitance retention after 14000 cycles in NH₄Cl/PVA electrolyte. The intercalation pseudocapacitance and double layer capacitance are contributed to the charge storage mechanism of NVO. The flexible quasi-solid-state NVO//AC hybrid supercapacitor is assembled and displays outstanding electrochemical performances with high capacitance, long lifespan and practical applications with good mechanical stability and flexibility in various bending states and excellent series and parallel performance. This work not only demonstrates that NVO has great potential for NH₄⁺ storages, but also sheds a light on NH₄Cl/PVA electrolyte for flexible aqueous NH₄⁺-supercapacitors.

水性储能系统因其安全性高、成本低和环境友好的优点而显示出巨大的前景。近年来，巨大的努力集中在这些采用金属阳离子作为电荷载流子的系统上。在水性可充电电池中，范式转变最近已转移到非金属离子作为电荷载体（例如：H ⁺、NH ₄ ⁺）。在此，我们报告了一种具有出色 NH ₄ ⁺存储能力的铵钒氧化物骨架 (NVO) 。使用NH ₄ Cl/PVA 凝胶电解质大大提高了NVO 的电容和循环性能。在三电极配置中，在 0.5 A g ^{-1 时}，NVO 电极提供 339 F·g ^-1的比电容(610 C·g ^-1 , 169 mAh·g ^-1 ) 在NH ₄ Cl/PVA 电解液中, 远高于268 F·g ^-1 (483 C·g ^-1 , 134 mAh·g ^{- 1} ) 在 NH ₄ Cl 电解液中。它在 NH _{4 中}循环 14000 次后显示 71% 的电容保持率Cl/PVA 电解液。插层赝电容和双层电容有助于 NVO 的电荷存储机制。组装的柔性准固态NVO//AC混合超级电容器显示出优异的电化学性能、高容量、长寿命和实际应用，在各种弯曲状态下具有良好的机械稳定性和柔韧性以及优异的串并联性能。这项工作不仅证明了 NVO 在 NH ₄ ⁺存储方面具有巨大潜力，而且还揭示了用于柔性水性 NH ₄ ^{+ -}超级电容器的NH ₄ Cl/PVA 电解质。