Co_(x)Se_(y)/Co_(3)S_(4)纳米复合材料的合成及其电化学储能性能

Synthesis of Co_(x)Se_(y)/Co_(3)S_(4) nanocomposites and their performance in electrochemical energy storage

因硫族化合物作为超级电容器电极材料具有电容性能高、循环寿命长等优点,研究制备了Co_(x)Se_(y)/Co_(3)S_(4)纳米复合材料并系统地探究了其电化学性能。作为超级电容器电极材料,Co_(x)Se_(y)/Co_(3)S_(4)纳米复合材料在1 mA·cm^(-2)的电流密度下,面积比电容可达到7 161.4 mF·cm^(-2);组装的Co_(x)Se_(y)/Co_(3)S_(4)/NF//AC(NF为泡沫镍,AC为活性炭)非对称超级电容器,在2.5 mA·cm^(-2)的电流密度下,面积比电容为1 989.1 mF·cm^(-2);组装的Co_(x)Se_(y)/Co_(3)S_(4)/NF//AC固态电解质超级电容器,在15 mA·cm^(-2)的电流密度下,面积比电容为1 746.2 mF·cm^(-2);而且串联器件表现出了典型的电压放大特征,并联器件表现出典型的电容放大的特征。总之,研究不仅展现了Co_(x)Se_(y)/Co_(3)S_(4)纳米复合材料在电化学储能领域的应用潜力,也为构筑新型电化学储能材料提供了新的途径。

Chalcogenides have advantages of high capacitance performance and long cycle life as electrode materials for supercapacitors.Co_(x)Se_(y)/Co_(3)S_(4) nanocomposites were prepared and their electrochemical properties were systematically studied.As the electrode material of supercapacitors,the area specific capacitance of Co_(x)Se_(y)/Co_(3)S_(4) nanocomposites can reach 7161.4 mF×cm^(-2) at a current density of 1 mF×cm^(-2).The assembled Co_(x)Se_(y)/Co_(3)S_(4)/NF//AC asymmetric supercapacitor has an area specific capacitance of 1989.1 mA×cm^(-2) at a current density of 2.5 mA×cm^(-2).The assembled Co_(x)Se_(y)/Co_(3)S_(4)/NF//AC solid-state electrolytic supercapacitors have an area specific capacitance of 1746.2 mF×cm^(-2) at a current density of 15 mA×cm^(-2).Moreover,the series device exhibits typical voltage amplification characteristics and the parallel device exhibits typical capacitive amplification characteristics.In conclusion,this study demonstrates the application potential of Co_(x)Se_(y)/Co_(3)S_(4) nanocomposites in electrochemical energy storage,and provides guidance to construct new electrochemical energy storage materials.