基于过渡金属硫化物/还原氧化石墨烯复合物的高性能超级电容器

组装高能量密度的非对称超级电容器需要使用比电容大、 体积变化小且循环稳定性好的电极材料. 过渡金属硫化物(TMSs)与纳米碳材料的复合物是此类电极材料之一. 采用水热法合成了由Cu-Mo硫化物在微波剥离的还原氧化石墨烯表面生长的复合材料(CuS-MoS₂/MErGO). 此复合材料在电流密度为2 A/g时具有高达861.5 F/g的比电容和良好的循环稳定性. 将1.6 V的电池电压施加在由NiS/MErGO为正极, CuS-MoS₂/MErGO为负极组装成的不对称超级电容器上时, 该电容器的功率密度为1.28 kW/kg, 且能量密度保持为54.2 W·h·kg^-1. 结果表明, TMS复合材料是一种很有前途的高性能电化学储能材料, 尤其是用于非对称超级电容器的组装.

Transition Metal Sulfides Hybridized with Reduced Graphene Oxide for High-Performance Supercapacitors

To assemble high-energy density asymmetric supercapacitors， the development of electrode mate-rials with large specific capacitances， negligible volume changes and long cycling stability is highly required. The hybrids of multiple transition metal sulfides with carbon nanomaterials are promising electrode materials. In this study， a hybrid consisting of Cu-Mo sulfides grown on microwave exfoliated reduced graphene oxide（CuS-MoS₂/MErGO） was thus synthesized by means of a hydrothermal method. The CuS-MoS₂/MErGO hybrid exhibits a specific capacitance up to 861.5 F/g at a current density of 2 A/g and long cycling life. An asymme-tric supercapacitor was assembled using the positive electrode of NiS/MErGO and the negative electrode of CuS-MoS₂/MErGO. It delivers an energy density of up to 54.2 W·h·kg^-1 at a power density of 1.28 kW/kg when a cell voltage of 1.6 V is applied. Therefore， the TMS hybrids are promising electrode materials for high-performance electrochemical energy storage applications such as for the assemble of asymmetric supercapacitors.