超级电容器
材料科学
电容
六亚甲基四胺
碳化
电化学
石墨烯
功率密度
MXenes公司
电极
纳米技术
化学工程
复合数
复合材料
化学
扫描电子显微镜
功率(物理)
物理
物理化学
量子力学
工程类
作者
Chenjing Shi,Zijie Liu,Zhen Tian,Dan Li,Yanjun Chen,Li Guo,Yanzhong Wang
标识
DOI:10.1016/j.apsusc.2022.153632
摘要
Two-dimensional titanium carbide (MXene) has attracted a wide attention for its fast charging and discharging ability as an electrode for supercapacitors. Tremendous efforts have been dedicated to further optimize the electrochemical performance of MXene by adjusting the interlayer spacing and surface functional groups. Here, hexamethylenetetramine (HMT) molecules are used as an intercalation agent to enlarge the layer spacing of MXene nanosheets and regulate their electronic structure by the partial replacement of the surface functional groups (F, O and OH) with N elements via the carbonization temperature at 300 °C. The as-prepared N-doped MXene film exhibits the excellent flexibility, appropriate layer spacing and high electrical conductivity, which can be used directly as supercapacitor electrode materials. It delivers the excellent rate performance with a specific capacitance of 193 F g−1 at 2000 mV s−1. In addition, the assembled asymmetric supercapacitor with N-doped graphene aerogel, delivers a high energy density of 26.22 W h kg−1 at a power density of 899 W kg−1, and the capacitance retention of 92.1 % after 25,000 discharging/charging cycles, indicating the excellent application prospect.
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