Hierarchical mesoporous NiCo2O4 hollow nanocubes for supercapacitors
文献情報
Chuanbao Cao, Jianhua Hou, Huazhang Zhai
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.
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