热解
电解质
阳极
化学工程
碳纤维
吸附
阴极
材料科学
多孔性
比表面积
纳米颗粒
电容器
氧气
电极
化学
纳米技术
电压
复合材料
有机化学
催化作用
复合数
工程类
物理
物理化学
量子力学
作者
Yong Qian,Bei Wu,Yang Li,Zhen Pan,Jie Tian,Ning Lin,Yitai Qian
标识
DOI:10.1016/j.cej.2022.138579
摘要
Herein, a pressure-dependent self-template pyrolysis strategy is developed to modulate the porosity and surface chemical configuration of carbon electrodes (MPCs) for dual-carbon potassium ion hybrid capacitors (PIHCs). Experiments demonstrate that negative pyrolysis pressure (△P = −0.1 MPa) can restrict the growth of templates in the carbon matrix and accelerate surface oxygen removal, contributing to a large surface area of 2383.6 m2 g−1 with abundant micropores for high adsorption capacity and low surface oxygen content for good compatibility with the electrolyte at high voltage as cathodes. Relatively, positive pressure (△P = 10.0 MPa) prevents the escape of pyrolysis gas which would in turn re-react with the self-generated templates, thereby forming hierarchical macroporous structure composed of interconnected carbon nanosheets and nanoparticles for high-rate capabilities as anodes. As a result, NPC cathodes exhibit high capacity of 63.7 mA h g−1 after 8000 cycles at 2.0 A g−1, while PPC anodes deliver high capacity of 258.8 mA h g−1 with capacity retention of 93.5 % after 10,000 cycles at 5.0 A g−1. The assembled PPC//NPC PIHCs also exhibit high energy density of 172.8 Wh kg−1 at 223.1 W kg−1, with long-term cycling stability over 10,000 cycles at 1.0 A g−1 or 2.0 A g−1.
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