Hierarchical mesoporous NiCo2O4 hollow nanocubes for supercapacitors
Hierarchical mesoporous NiCo2O4 hollow nanocubes for supercapacitors
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用于超级电容器的分层介孔NiCo2O4空心纳米立方体
DOI：
10.1039/c5cp07997g
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发表时间：
2016
影响因子：
3.3
通讯作者：
Zhai Huazhang
中科院分区：
文献类型：
--
作者：
Zheng Chunrui;Cao Chuanbao;Chang Runling;Hou Jianhua;Zhai Huazhang
本文采用“配合蚀刻-沉淀”（CEP）工艺合成了介孔NiCo2O4中空纳米立方体。采用SEM、TEM、XRD、XPS和BET等方法对空心纳米立方体进行了表征。空心纳米立方体具有300 ~ 500 nm的均匀形貌，134.52 m2 g−1的高表面积和2.4 ~ 6 nm的介孔结构。在恒定放电电流密度为1 a g−1时，这些介孔NiCo2O4空心纳米立方体的比电容为795.6 F g−1。NiCo2O4中空纳米立方电极具有较高的比电容和稳定性，主要归因于其较大的比表面积和介孔结构。在电流密度为1 a g−1时，2000次充放电循环的比容量保持率为97.5%，在电流密度为2 a g−1时，比容量保持率为96.1%。高比电容和优异的循环稳定性表明，NiCo2O4空心纳米立方是一种优良的超级电容器电极材料。
In the present work, mesoporous NiCo2O4 hollow nanocubes are synthesized using a “coordinating etching & precipitating” (CEP) route. The hollow nanocubes are characterized using SEM, TEM, XRD, XPS and BET methods. The hollow nanocubes have a uniform morphology of 300–500 nm, a high surface area of 134.52 m2 g−1 and a mesoporous structure of 2.4–6 nm. These mesoporous NiCo2O4 hollow nanocubes exhibit the specific capacitance of 795.6 F g−1 at a constant discharge current density of 1 A g−1. The high specific capacitance and the stability of the NiCo2O4 hollow nanocube electrode are attributed to its large specific surface area and mesoporous structure. The specific capacity retention is 97.5% at a current density of 1 A g−1 and 96.1% at a current density of 2 A g−1 over 2000 charge–discharge cycles. The high specific capacitance and excellent cyclic stability indicate that NiCo2O4 hollow nanocubes are excellent supercapacitor electrode materials.