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| Preparation and Electrochemical Performance of Nanoporous Bimetallic Oxide NiCo2O4 |
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| Abstract: Nanoporous Ni and Ni-Co alloys were prepared by a method of rapid quenching and de-alloying, and the samples were corroded and annealed to synthesize the nanoporous NiO and NiCo2O4 material respectively. The composition, morphology and microstructure of NiO and NiCo2O4 were analyzed by XRD, SEM, TEM and N2 adsorption-desorption. The electrochemical performance was investigated by cyclic voltammetry and galvanostatic charge-discharge. The results show that the porous NiO has a uniform "mud crack" structure. The specific capacitance of nanoporous NiO is 375 F·g-1 at current density of 1 A·g-1 and its retention ratio remains at 67.5% when the current density increases to 20 A·g-1. After galvanostatic charge-discharge 1 000 cycles at 4 A·g-1, the retention ratio of specific capacitance is 81.7%. The porous NiCo2O4 has a lamellar structure. The specific capacitance of nanoporous NiCo2O4 is 674 F·g-1 at current density of 1 A·g-1 and its retention ratio remains at 72.0% when the current density increases to 20 A·g-1. After galvanostatic charge-discharge 1 000 cycles at 4 A·g-1, the retention ratio of specific capacitance is 92.9%. NiCo2O4 shows superior supercapacitive performance because of the mechanical stability of the bicontinuous nanoporous structure. |
| Keywords: rapid quenching de-alloying metallic oxide electrochemical performance |
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| ZHOU Qi,LI Zhi-Yang,ZHENG Bin.Preparation and Electrochemical Performance of Nanoporous Bimetallic Oxide NiCo2O4[J].Chinese Journal of Inorganic Chemistry,2018,34(6):1103-1109. |
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