两种形貌的高储电性能ZnCo_(2)O_(4)电极材料

Two morphologies of ZnCo_(2)O_(4) electrode materials with high electrical storage properties

由于ZnCo_(2)O_(4)具有合成方法简单、成本低廉等优点,成为超级电容器领域的一种重要电极材料.通过水热、退火两步处理,制备了两种不同形貌的ZnCo_(2)O_(4)材料,并在三电极体系中测试其超级电容器性能.结果表明,花状形貌的ZnCo_(2)O_(4)纳米片微球比纳米片状ZnCo_(2)O_(4)的性能更好.电流密度1 A·g^(-1)时,ZnCo_(2)O_(4)纳米片微球电极的比电容高达3 005.0 F·g^(-1);电流密度20 A·g^(-1)时,比电容仍能保持2150.0F·g^(-1),电容保持率为71.5%.循环充/放电10000次后,电容保持率仍达到93.8%.该ZnCo_(2)O_(4)纳米片微球电极材料在超级电容器电极领域具有良好的应用前景.

ZnCo_(2)O_(4)has become an important electrode material in the field of supercapacitors due to its simple synthesis method and low cost.Prepared two different morphologies of ZnCo_(2)O_(4)materials through two steps of hydrothermal and annealing treatment,and tested their supercapacitor performance in a three-electrode system.The results showed that the performance of ZnCo_(2)O_(4)electrode with flower shaped nanosheet microsphere morphology is better than that of ZnCo_(2)O_(4)electrode with nanosheet morphology.At a current density of 1 A·g^(-1),the specific capacitance of the ZnCo_(2)O_(4)nanosheet microsphere electrode is as high as 3005.0 F·g^(-1).At a current density of 20 A·g^(-1),the specific capacitance can still be maintained at 2150.0 F·g^(-1),with a capacitance retention rate of 71.5%.After 10000 cycles of charging/discharging,the capacitance retention rate still reaches 93.8%.The ZnCo_(2)O_(4)