As an emerging research on multivalent zinc ion hybrid supercapacitors has been made huge leap, yet low cycle stability and low energy density are always the main bottlenecks of hybrid capacitors. The layered structure material Zn-doped δ-MnO₂ to promote the insertion/extraction of zinc ions is used as the cathode and activated carbon is used as the anode exploiting battery and capacitor energy storage mechanism to increase energy density without sacrificing power density. Electrochemical measurements manifested that the assembled aqueous zinc ion hybrid capacitor has a high energy density of 157.2 Wh kg^-1, a power density of 16 kW kg^-1 (0.2 A g^-1) and good cycling stability with 80.2% capacity retention over 30,000 charge/discharge cycles. The excellent electrochemical performance of the device is attributed to the stable layered structure of pre-zincified MnO₂, which makes the insertion/extraction of Zn²⁺ greatly reversible. This study provides a novel strategy for new generation zinc ion hybrid capacitors.

作为新兴的多价锌离子混合超级电容器研究取得了巨大飞跃，但低循环稳定性和低能量密度一直是混合电容器的主要瓶颈。以促进锌离子嵌入/脱嵌的层状结构材料Zn掺杂的δ-MnO ₂为正极，活性炭为负极，利用电池和电容器的储能机制，在不牺牲功率密度的情况下提高能量密度。电化学测量表明组装的水性锌离子混合电容器具有157.2 Wh kg ^-1的高能量密度，16 kW kg ^-1 (0.2 A g ^-1) 和良好的循环稳定性，在 30,000 次充电/放电循环中容量保持率为 80.2%。该器件优异的电化学性能归功于预锌化MnO ₂的稳定层状结构，这使得Zn ²⁺的嵌入/脱嵌具有极大的可逆性。该研究为新一代锌离子混合电容器提供了一种新策略。