超级电容器
纳米花
阳极
材料科学
复合数
石墨烯
电容
化学工程
阴极
硫化镍
电极
功率密度
储能
纳米技术
硫化物
纳米结构
化学
复合材料
冶金
物理
工程类
物理化学
功率(物理)
量子力学
作者
Hao Líu,Rui Hu,Jiqiu Qi,Yanwei Sui,Yezeng He,Qingkun Meng,Fuxiang Wei,Yaojian Ren,Yulong Zhao
标识
DOI:10.1016/j.electacta.2020.136526
摘要
Transition metal sulfide is a good choice for supercapacitor anode materials. Herein, 3D NiS with flower-like shape was grown on MXene (Ti3C2TX) with one-step hydrothermal method. Connected nanoflakes in the composite formed a large void network structure, which favors the transfer of ions and charges. Compared with pure MXene, MXene/NiS composite exhibited higher specific capacity of 554.1 mAhg−1 (857.8 F g−1) at 1 A g−1 which is approximately 4 times greater than that MXene and superior cycle performance of 99.49% capacitance retained after 3000 cycles at 5 A g−1. The asymmetric supercapacitors were assemble in 2 M KOH alkaline solution with anode of MXene/NiS and cathode of G/AC (graphene/activated carbon). The ASCs device emerges a remarkable cycle performance of 97.7% after 3000 cycles and the energy density is up to 17.688 Wh kg−1 at a power density of 750 W kg−1. The small bulb (12 V, 2 W) can be lit for more than 100 s.
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