Ultrafast high-energy micro-supercapacitors based on open-shell polymer-graphene composites
Ultrafast high-energy micro-supercapacitors based on open-shell polymer-graphene composites
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DOI：
10.1016/j.xcrp.2022.100792
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发表时间：
2022-03
影响因子：
8.9
通讯作者：
Lulu Yao;Jiaxi Liu;N. Eedugurala;Paramasivam Mahalingavelar;Daniel J. Adams;Kaiping Wang;Kevin S. Mayer;J. Azoulay;T. Ng
中科院分区：
文献类型：
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作者：
Lulu Yao;Jiaxi Liu;N. Eedugurala;Paramasivam Mahalingavelar;Daniel J. Adams;Kaiping Wang;Kevin S. Mayer;J. Azoulay;T. Ng
微型超级电容器有望成为电子产品的片上电源。然而，同时提高其功率、能量和寿命的挑战需要超越当前碳基系统的新材料组合。在这里，我们证明了具有还原氧化石墨烯的开壳共轭聚合物的电沉积实现了电容高达186 mF cm−2（372 F cm−3）的电极。开壳聚合物内的扩展离域稳定氧化还原状态并促进3V宽的电势窗口，而分级电极结构促进超快动力学。该微型超级电容器显示出227 mW cm− 2的高功率密度，10.5 μWh cm− 2的能量密度和11，000次循环后84%的电容保持率的稳定性。这些属性允许在快速充电和交流（AC）线路滤波应用中在120 Hz下操作，这可能适合于替换笨重的电解电容器或用作无线电子设备的高耐久性能量存储。
Micro-supercapacitors are poised to serve as on-chip power sources for electronics. However, the challenge to simultaneously increase their power, energy, and lifetime demands new material combinations beyond current carbon-based systems. Here, we demonstrate that electro-deposition of an open-shell conjugated polymer with reduced graphene oxide achieves electrodes with capacitance up to 186 mF cm−2(372 F cm−3). The extended delocalization within the open-shell polymer stabilizes redox states and facilitates a 3 V wide potential window, while the hierarchical electrode structure promotes ultrafast kinetics. The micro-supercapacitor shows a high power density of 227 mW cm−2with an energy density of 10.5 μWh cm−2and stability of 84% capacitance retention after 11,000 cycles. These attributes allow operation at 120 Hz for fast charging and alternating current (AC) line filtering applications, which may be suitable to replace bulky electrolytic capacitors or serve as high-endurance energy storage for wireless electronics.