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Effect of dopant on the morphology and electrochemical performance of Ni1-xCaxCo2O4 (0 ≤ x ≤ 0.8) oxide hierarchical structures

Published online by Cambridge University Press:  23 March 2020

D. Guragain ,
C. Zequine ,
R. Bhattarai ,
J. Choi ,
R. K. Gupta ,
X. Shen  and
S. R. Mishra
D. Guragain
Affiliation:
Department of Physics and Materials Science, The University of Memphis, Memphis, TN 38152
C. Zequine
Affiliation:
Department of Chemistry, Pittsburg State University, Pittsburg, KS 66762
R. Bhattarai
Affiliation:
Department of Physics and Materials Science, The University of Memphis, Memphis, TN 38152
J. Choi
Affiliation:
Department of Chemistry, Pittsburg State University, Pittsburg, KS 66762
R. K. Gupta
Affiliation:
Department of Chemistry, Pittsburg State University, Pittsburg, KS 66762
X. Shen
Affiliation:
Department of Physics and Materials Science, The University of Memphis, Memphis, TN 38152
S. R. Mishra*
Affiliation:
Department of Physics and Materials Science, The University of Memphis, Memphis, TN 38152
*
*(Email: srmishra@memphis.edu)
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Abstract

The binary metal oxides are increasingly used as supercapacitor electrode materials in energy storing devices. Particularly NiCo2O4 has shown promising electrocapacitive performance with high specific capacitance and energy density. The electrocapacitive performance of these oxides largely depends on their morphology and electrical properties governed by their energy band-gaps and defects. The morphological structure of NiCo2O4 can be altered via the synthesis route, while the energy band-gap could be altered by doping. Also, doping can enhance crystal stability and bring in grain refinement, which can further improve the much-needed surface area for high specific capacitance. Given the above, this study evaluates the electrochemical performance of Ca-doped Ni1-xCaxCo2O4 (0 ≤ x ≤ 0.8) compounds. This stipulates promising applications for electrodes in future supercapacitors.

Keywords

absorptionchemical reactionelectrochemical synthesisscanning electron microscopy (SEM)hydrothermal

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Type
Articles
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MRS Advances , Volume 5 , Issue 48-49: Energy, Storage and Conversion , 2020 , pp. 2487 - 2494
Copyright
Copyright © Materials Research Society 2020

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