基于有序结构镍钴双金属氧族化合物纳米阵列/碳泡沫复合材料的柔性不对称超级电容器

Flexible Asymmetric Supercapacitors Based on Well-ordered Bimetallic Nickel-cobalt Chalcogenides Nanoarray/Carbon Foam Composites

以碳化三聚氰胺泡沫为柔性基底,负载高度有序的镍钴双金属氧/硫/硒化物纳米棒阵列和氧化铋纳米片阵列,分别作为正负极构筑了一系列不对称柔性超级电容器。研究表明,镍钴硒化物电容性能明显优于氧化物和硫化物,所制备的不对称电容器在1 mA/cm^(2)电流密度下面积电容可以达到620.9 mF/cm^(2),功率密度和能量密度分别为3.75 mW/cm^(3)和0.97 mWh/cm^(3),循环6000次电容保持率为91.2%,重复弯折200次后,仍保留88.6%的初始比电容。因此,基于镍钴硒化物和氧化铋的不对称超级电容器在高性能柔性储能器件领域具有潜在的应用价值。

Aseries of flexible asymmetric supercapacitors were constructed by using carbonized melamine foam as flexible substrate,which was decorated by high-ordered nickel cobalt oxide/sulfide/selenide nanorods arrays and bismuth oxide nanosheets and used as positive and negative electrode respectively.The performance of Ni-Co selenide is better than those of oxide and sulfide,hence the as-obtained asymmetric supercapacitor shows a high area capacitance of 620.9 mF/cm^(2) at 1 mA/cm^(2),the power density and energy density are 3.75 mW/cm^(3) and 0.97 mWh/cm^(3),respectively,and the capacity retention rate of 6000 cycles is 91.2%.After bending for 200 times,the device still maintains 88.6%of its initial capacitance.Therefore,the asymmetric supercapacitor based on Ni-Co selenide and bismuth oxide has great potential in the field of high-performance flexible energy storage devices.