CuCo2S4 Nanosheets Coupled With Carbon Nanotube Heterostructures for Highly Efficient Capacitive Energy Storage

作者：Meiling Li, Kang Xiao, Hang Su, Nan Li, Yuepeng Cai, Zhao‐Qing Liu · 发表于：ChemElectroChem · 年份：2018 · DOI：10.1002/celc.201800329 · 被引用次数：33 · 研究领域：Supercapacitor Materials and Fabrication、Advanced battery technologies research、Advancements in Battery Materials

Abstract Highly efficient electrode materials with high specific capacitance, good rate capability, and durable cycling stability are of great importance for supercapacitors (SCs). Herein, we report a highly active electrode material based on carbon nanotubes (CNTs) as the supporter and copper cobalt bimetallic sulfide as the active material. The CuCo 2 S 4 /CNTs electrode exhibits a good electrochemical performance with a high specific capacity of 1690.3 F g −1 at 1 A g −1 , good rate capability with 62.6 % capacitance retention at 50 A g −1 , and good cycling stability that retains about 95.5 % of the capacitance after 10 000 cycles. The asymmetric supercapacitors (ACS) are self‐assembled by using CuCo 2 S 4 /CNTs as the positive electrode and CNTs as the negative electrode, exhibiting a high energy density of 37.32 Wh kg −1 at a power density of 800.7 W kg −1 . This work provides directly empirical evidence for the design and optimization of the supercapacitive performance of transition‐metal compounds.