硫脲
化学
电解质
间苯二酚
电容
碳纤维
杂原子
化学工程
电流密度
兴奋剂
多孔性
分析化学(期刊)
材料科学
有机化学
电极
复合材料
光电子学
物理化学
物理
工程类
复合数
量子力学
戒指(化学)
作者
Liping Feng,Yunzhen Chang,Hua Song,Wenjing Hou,Yanping Li,Yun Zhao,Yaoming Xiao,Gaoyi Han
标识
DOI:10.1016/j.jelechem.2022.116069
摘要
Introducing fast pseudo-capacitance is an effective strategy to improve the capacitive performances of carbon-based materials. Here, thiourea is used as nitrogen and sulfur source to dope resorcinol formaldehyde polymer. Besides the forming of copolymer of thiourea and resorcinol formaldehyde resin, the thiourea resin also acts as template to adjust the hierarchical microstructure. The N, S co-doped porous carbon exhibits specific surface area of 3599.0 m2 g−1 and wide pore distribution. The specific capacitance of the optimized sample can reach 461.7 F g−1 in 6.0 mol L−1 KOH electrolyte at current density of 0.1 A g−1, and still retains 337.5 F g−1 at current density of 10.0 A g−1, indicting good rate capability. The assembled symmetric device exhibits the maximum energy density of 14.9 Wh kg−1 at the power density of 61.9 W kg−1 based on the active materials. The capacitance can retain 98.3 % of the initial capacitance after 10,000 cycles at current of 10.0 A g−1. Using organic electrolyte, the operating voltage can be extended to 2.1 V, so the energy density of the device reaches 38.3 Wh kg−1 at 262.5 W kg−1. This co-doped strategy provides an effective approach to prepared carbon-based materials with high capacitive performance.
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