Wu Mingmao, Chi Fengyao, Geng Hongya, Ma Hongyun, Zhang Miao, Gao Tiantian, Li Chun, Qu Liangti
Department of Chemistry, Tsinghua University, 100084, Beijing, P. R. China.
Key Laboratory for Advanced Materials Processing Technology, Ministry of Education of China, Department of Mechanical Engineering, Tsinghua University, Beijing, 100084, P. R. China.
Nat Commun. 2019 Jun 28;10(1):2855. doi: 10.1038/s41467-019-10886-7.
Filtering capacitor is a necessary component in the modern electronic circuit. Traditional filtering capacitor is often limited by its bulky and rigid configuration and narrow workable scope of applications. Here, an aqueous hybrid electrochemical capacitor is developed for alternating current line filtering with an applicable wide frequency range from 1 to 10,000 Hz. This capacitor possesses an areal specific energy density of 438 μF V cm at 120 Hz, which to the best of our knowledge is record high among aqueous electrochemical capacitors reported so far. It can convert arbitrary alternating current waveforms and even noises to straight signals. After integration of capacitor units, a workable voltage up to hundreds of volts (e.g., 200 V) could be achieved without sacrificing its filtering capability. The integrated features of wide frequency range and high workable voltage for this capacitor present promise for multi-scenario and applicable filtering capacitors of practical importance.
滤波电容器是现代电子电路中的一个必要组件。传统滤波电容器常常受到其体积庞大、结构刚性以及应用工作范围狭窄的限制。在此，开发了一种用于交流线路滤波的水系混合电化学电容器，其适用频率范围为1至10,000赫兹。该电容器在120赫兹时具有438 μF V cm的面积比能量密度，据我们所知，这是迄今为止报道的水系电化学电容器中创纪录的高值。它可以将任意交流波形甚至噪声转换为直流信号。在集成电容器单元后，可实现高达数百伏（例如200 V）的工作电压，而不牺牲其滤波能力。该电容器宽频率范围和高工作电压的集成特性为具有实际重要性的多场景适用滤波电容器带来了前景。
