超级电容器
材料科学
石墨烯
纳米片
电解质
电容
离子液体
化学工程
碳纤维
储能
氧化物
电化学
电极
纳米技术
纳米材料
化学
有机化学
复合材料
催化作用
复合数
工程类
物理化学
物理
功率(物理)
冶金
量子力学
作者
Shaofeng Li,Chang Yu,Juan Yang,Changtai Zhao,Xiaoming Fan,Hongtao Huang,Xiaotong Han,Jingxian Wang,Xiaojun He,Jieshan Qiu
标识
DOI:10.1002/celc.201600614
摘要
Abstract Two‐dimensional carbon nanosheets are promising materials as supercapacitor electrodes for high‐efficiency energy storage. Herein, a simple strategy is engineered to configure ultrathin nitrogen‐enriched hybrid carbon nanosheets (HCNSs) with a thickness of approximately 3.6 nm using graphene oxide as a structure‐directing agent and nano‐CaCO 3 as an in‐situ‐activated agent. The polydopamine synthesized in situ on the graphene oxide sheet surface is used as a nitrogen‐rich carbon precursor, leading to the formation of nearly transparent nitrogen‐enriched HCNSs under an electron beam. Benefiting from the nitrogen‐enriched species (8.92 wt % N content), highly exposed electroactive sites and fast ion/electron transport arising from the porous and ultrathin nanosheet structure, the HCNS electrode exhibits remarkably enhanced electrochemical characteristics with a high specific capacitance of 227 F g −1 at 0.5 A g −1 and superior rate capability (70 % capacitance retention at 100 A g −1 ) in 6 m KOH electrolyte. More importantly, it delivers a high energy density of 86.6 W h kg −1 at a power density of 111 W kg −1 in a 1‐butyl‐3‐methylimidazolium hexafluorophosphate ionic liquid electrolyte. This study might shed new light on the configuration of nitrogen‐enriched and ultrathin 2D carbon nanomaterials for high‐efficiency energy storage/conversion devices.
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