A novel asymmetrical-bipolar electrochemical capacitor system leveraging the contributions of a Zn-CNT asymmetrical electrode and a KOH-H₂SO₄ dual-pH electrolyte was developed. The positive and negative electrodes operated in electrolytes with different pH, exploiting the maximum potential of both electrodes, which led to a cell voltage of 2.4 V. The potential tracking of both electrodes revealed that the Zn negative electrode could maintain a potential at −1.2 V, while the CNT positive electrode can be charged to +1.2 V without significant irreversible reactions. A bipolar ion exchange membrane has effectively separated the acid and alkaline from neutralization, which resulted in stable performance of the device with capacitance retention of 94% and coulombic efficiency of 99% over 10,000 cycles. This asymmetrical-bipolar design overcomes the thermodynamic limit of water decomposition, opening a new avenue towards high energy and high power density aqueous-based ECs.

利用Zn-CNT不对称电极和KOH-H ₂ SO ₄的贡献的新型不对称双极电化学电容器系统开发了双pH电解液。正极和负极在不同pH的电解液中运行，利用两个电极的最大电势，导致电池电压为2.4V。两个电极的电势追踪表明Zn负极可将电势维持在-1.2 V ，而CNT正极可以充电至+1.2 V，而不会发生明显的不可逆反应。双极性离子交换膜有效地将酸和碱与中和分离开来，从而在10,000次循环中保持了94％的电容保持率和99％的库仑效率，从而实现了器件的稳定性能。这种非对称双极设计克服了水分解的热力学极限，为通向高能量和高功率密度的水基EC开辟了一条新途径。