Citation: 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. doi: 10.11862/CJIC.2018.146 shu

Preparation and Electrochemical Performance of Nanoporous Bimetallic Oxide NiCo₂O₄

State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China

Corresponding author: ZHOU Qi, zhouxq301@sina.com
Received Date: 21 January 2018
Revised Date: 26 March 2018

Figures(7)

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.
- rapid quenching,
- de-alloying,
- metallic oxide,
- electrochemical performance
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