超级电容器
杂原子
碳化
材料科学
介孔材料
电解质
碳纤维
化学工程
三聚氰胺
纳米技术
功率密度
多孔性
复合材料
化学
电容
复合数
电极
有机化学
工程类
扫描电子显微镜
物理化学
戒指(化学)
功率(物理)
量子力学
催化作用
物理
作者
Liu Wan,Xiang Li,Na Li,Mingjiang Xie,Cheng Du,Yan Zhang,Jian Chen
标识
DOI:10.1016/j.jallcom.2019.03.241
摘要
Biomass-derived porous carbon materials hold good prospects for application in supercapacitor owing to their natural abundance, low cost, as well as high heteroatoms content. Herein, multi-heteroatom-doped hierarchical porous carbon was prepared via on-step carbonization process by using chestnut shells as raw material and melamine as activation agent. The obtained chestnut shell-derived carbons exhibit a high specific area (691.8 m2 g−1), abundant interconnected micropores/mesopores, proper level of graphitization, considerable content of heteroatoms (∼3.79 at. % N, ∼13.35 at. % O, and ∼0.52 at. % S). Benefiting from these superior characteristics, the obtained carbon electrode exhibits a high specific capacitance (402.8 F g−1 at 0.5 A g−1 in a three-electrode system) and outstanding rate capability (45.3% capacitance retention at 100 A g−1) in KOH electrolyte. The fabricated symmetric supercapacitor delivers a superior energy density of 26.6 Wh kg−1 at a power density of 445.5 W kg−1. In addition, the supercapacitor device shows good cycling stability with a 96.6% capacitance retention after 20,000 cycles. These results demonstrates that the as-prepared carbonaceous materials have great potential for low-cost and high-performance supercapacitors.
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