Double-activated porous carbons for high-performance supercapacitor electrodes
来源期刊：Rare Metals2017年第5期
论文作者：Jing Sun Shu-Hua Yang Shan-Shan Li Bing-Qiang Cao
文章页码：449 - 456
摘 要：The double-activated porous carbons（DAPCs）with unique bimodal pore structure were prepared by activating commercial microporous carbon（CMCs） twice through KOH（double activation） at high temperature. The as-prepared DAPCs show larger surface area(833 m2·g-1),and the pores are composed of micropores（size of1.8 nm） and mesopores（size of 4.5 nm）. Such special hierarchical porous structures integrate the dual advantages of micropore and mesopore, having not only the high energy storage of the micropores but also the high-rate performance of the mesopores for supercapacitors（SCs）.As a result, the optimized DAPCs-3-1 exhibits a high specific capacitance of 277 F·g-1 at 1 A·g-1, enhanced rate performance of 197 F·g-1 at a high current density of 10 A·g-1, and excellent cycling stability with 94.2% capacity retention after 10,000 cycles in the 1 mol·L-1 Na2SO4 electrolyte. The facile double activation could be a promising method to prepare suitable porous carbons with exceptional electrochemical properties for SCs.
Jing Sun，Shu-Hua Yang，Shan-Shan Li，Bing-Qiang Cao
Materials Center for Energy and Photoelectrochemical Conversion, School of Material Science and Engineering,University of Jinan
摘 要：The double-activated porous carbons（DAPCs）with unique bimodal pore structure were prepared by activating commercial microporous carbon（CMCs） twice through KOH（double activation） at high temperature. The as-prepared DAPCs show larger surface area(833 m2·g-1),and the pores are composed of micropores（size of1.8 nm） and mesopores（size of 4.5 nm）. Such special hierarchical porous structures integrate the dual advantages of micropore and mesopore, having not only the high energy storage of the micropores but also the high-rate performance of the mesopores for supercapacitors（SCs）.As a result, the optimized DAPCs-3-1 exhibits a high specific capacitance of 277 F·g-1 at 1 A·g-1, enhanced rate performance of 197 F·g-1 at a high current density of 10 A·g-1, and excellent cycling stability with 94.2% capacity retention after 10,000 cycles in the 1 mol·L-1 Na2SO4 electrolyte. The facile double activation could be a promising method to prepare suitable porous carbons with exceptional electrochemical properties for SCs.
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