超级电容器
微球
模板
材料科学
对偶(语法数字)
兴奋剂
纳米技术
碳纤维
化学工程
光电子学
复合数
电化学
化学
复合材料
电极
工程类
艺术
文学类
物理化学
作者
B Q Li,Lu Zhang,Zhibo Zhao,Yu-xi Zou,Bingqi Chen,Xiaoguang Fu,Fangqiao Wang,Sishi Long,Wenxi Guo,Chun Zhu,Meidan Ye
标识
DOI:10.1016/j.cej.2024.150730
摘要
A multi-step strategy was rationally designed to fabricate hierarchical hollow core–shell microspheres of NiCo2S4MXene/N-doped carbon (NiCo2S4/MXene/NC) using dual templates of the polyethylene microspheres and metal–organic framework material of ZIF-67. The integration of MXene and N-doped carbon significantly enhances the electronic conductivity of electrode, while the construction of hollow spherical structures effectively alleviates the instability of NiCo2S4/NC during the charge–discharge cycles, leading to the excellent charge storage performance with a high specific capacitance (1786F g−1 at 1 A/g) and impressive cycling stability (over 100 % capacitance retention after 10,000 cycles). A corresponding hybrid supercapacitor displays a high specific capacitance (190F g−1 at 1 A/g) with a maximum energy density (67 Wh kg−1 at 796 W kg−1) and great cycling stability (over 80 % capacitance retention after 10,000 cycles). The charge storage mechanism of NiCo2S4/MXene/NC is elucidated, revealing a combination of pseudocapacitive and battery-like behavior. Density functional theory (DFT) calculations indicate that the participation of MXene significantly increases the state density of NiCo2S4/MXene near the Fermi level compared to NiCo2S4, affirming its superior metallic conductivity. This work provides a facile route only with room-temperature stirring and high-temperature calcination to prepare well-defined metal sulfide composite microstructures with high electrochemical performance.
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