1成果简介
滤波超级电容器（FSCs）凭借其卓越的功率特性和快速充放电能力，已成为替代传统铝电解电容器的理想候选方案，为电子设备的微型化和集成化提供了关键解决方案。然而，电极材料充放电速率与电荷存储容量之间的固有权衡制约了其进一步发展。本文，山东大学张光磊 教授 团队在《Appl Surf Sci》期刊发表名为“High-performance filter supercapacitors utilizing graphene aerogel composite thin-film electrodes”的论文，研究提出创新性复合电极设计策略，通过温和热化学还原法成功构建出具有高电子导电性的三维氧化石墨烯气凝胶薄膜骨架。其表面保留的含氧官能团显著提升离子电荷传输速率，最终实现电子导电性与离子导电性的协同优化。
同时，表面负载的高电化学活性CuxO纳米颗粒协同提升了该集成复合电极的电容密度。基于此电极的电容耦合滤波器在120Hz高频下展现出卓越的频率响应特性：相位角达?80.04°，面电容高达3.24mF/cm2。本研究不仅显著拓展了FSC在频率响应与电容密度平衡方面的性能边界，更为下一代微型化FSC的电极结构设计提供了创新性理论指导与技术解决方案。2图文导读
图1. (a) Schematic diagram of the structure and equivalent circuit of SC. (b) Magnetization of the material. (c) Typical Nyquist plots revealing the influence mechanism of parasitic inductance of the material on frequency response (ZIm (vertical axis) increases downward from negative values to 0). (d) Comparison of simulated electric field modulus distribution for materials of different sizes (the integrated electric field modulus values are summed and normalized in the figure). (e) Preparation flowchart of CTFE. (f) Schematic diagram of the structure of CTFE (the inset shows a schematic of CTFE surface morphology).
图2. Component analysis of CTFE. (a) XRD patterns. (b) FTIR spectra. (c–f) XPS spectra. (g) SEM images and (h–i) EDS mapping images of key elements.
图3. CTFE-based SCs. (a) Bode plots. (b) Nyquist plots. (c) CA vs. frequency plots. (d) CA′ and CA′′ vs. frequency plots. (e) CA′/CA and dissipation factor curves. (f) CV vs. frequency plots. (g) CV curves. (h–i) Cycling stability and GCD curves at 10?mA?cm?2. (j) Comparison of electrochemical performance with other reported results (Legend: The black, orange, and blue symbols correspond to FSCs based on carbon electrodes, carbon/pseudocapacitive composite electrodes, and pseudocapacitive electrodes,
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