Filtering capacitors with wide operating voltage range are essential for smoothing ripples in line-powered system, which are still unsatisfactory due to low energy density and limited working voltage scopes. Herein, we report an aqueous hybrid electrochemical capacitor with areal specific energy density of 1.29 mF V² cm⁻² at 120 Hz, greater than common aqueous ones. Interestingly, it can be easily integrated at scale to show excellent flexibility, controllable and stable filtering performance, in which an integrated device (e.g., seven units in series) exhibits fluctuation of 96 mV, 10 times smaller than an aluminum electrolytic capacitor with similar capacitance. A record-high 1,000 V can also be achieved after integrating 670 units, exceeding those reported so far, and about 1.5 times of commercial bulk aluminum electrolytic capacitors (~700 V). This work opens up a new insight for promising applications in multiple electricity transmission systems that requiring high smoothness under harsh voltage.

具有宽工作电压范围的滤波电容器对于消除线路供电系统中的纹波至关重要，但由于能量密度低和工作电压范围有限，仍不能令人满意。在此，我们报道了一种面积比能量密度为 1.29 mF V ² cm ^{-2的水性混合电化学电容器。}在 120 Hz 时，高于普通的水相。有趣的是，它可以很容易地大规模集成，表现出出色的灵活性、可控性和稳定的滤波性能，其中一个集成器件（例如，七个单元串联）的波动为 96 mV，比类似电容的铝电解电容器小 10 倍. 在集成 670 个单元后也可以达到创纪录的 1,000 V，超过了迄今为止报道的那些，大约是商用大容量铝电解电容器 (~700 V) 的 1.5 倍。这项工作为在恶劣电压下需要高平滑度的多个电力传输系统中的有前途的应用开辟了新的视角。