超级电容器
电解质
材料科学
氢氧化钾
碳化
化学工程
电容
电化学
碳纤维
分离器(采油)
储能
微型多孔材料
多孔性
比表面积
比能量
纳米技术
电极
化学
有机化学
复合材料
扫描电子显微镜
复合数
物理
工程类
热力学
物理化学
催化作用
功率(物理)
量子力学
作者
Lu Liu,Jin Niu,Zhengping Zhang,Feng Wang
出处
期刊:ACS applied energy materials
[American Chemical Society]
日期:2021-07-29
卷期号:4 (8): 7751-7758
被引量:9
标识
DOI:10.1021/acsaem.1c01138
摘要
As the primary electrode active materials for supercapacitors, porous carbons are widely prepared by carbonization-activation methods. Nevertheless, a simple activation procedure by using a single activator is hard to satisfy requirements of electrode materials in organic electrolytes, which can provide a larger voltage window but also demand larger-size micropores to accumulate/release charges than aqueous electrolytes. Herein, a rational co-activation method toward porous carbon nanosheets is developed for high-performance organic electrolyte-based supercapacitors by directly pyrolyzing zinc polyphthalocyanines-graft-potassium hydroxide (ZnPPc-g-KOH). The Zn2+ and K+ participate in pore formation, which facilitates the fabricating of porous carbon nanosheets with a large surface area of 2701 m2 g–1 and a narrow micropore-size distribution at around 1.50 nm. The resulting polyphthalocyanines-derived carbons deliver a high specific capacitance of 200 F g–1 at 10 A g–1 and a long cycling lifetime (over 98% of the initial capacitance after 10000 cycles) in 1.0 M TEABF4/AN, along with high energy and power properties (44.5/35.0 Wh kg–1 at 3.1/28.6 kW kg–1, respectively) in the symmetric supercapacitor. This polyphthalocyanines-derived carbon opens up a route to develop carbon-based active materials with well-built porous structures for electrochemical energy storage and conversion.
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