Mechanistic investigation of defect-engineered, non-stoichiometric, and Morphology-regulated hierarchical rhombus-/spindle-/peanut-like ZnCo2O4 microstructures and their applications toward high-performance supercapacitors

Reddy, GR and Dillip, GR and Sreekanth, TVM and Rajavaram, R and Raju, BDP and Nagajyothi, PC and Shim, J (2020) Mechanistic investigation of defect-engineered, non-stoichiometric, and Morphology-regulated hierarchical rhombus-/spindle-/peanut-like ZnCo2O4 microstructures and their applications toward high-performance supercapacitors. In: Applied Surface Science, 529 .

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Abstract

Self-assembled hierarchical rhombus-, spindle-, and peanut-like zinc cobaltite (ZnCo2O4, ZCO) microstructures have strategically engineered using an effective solvothermal approach. The various morphology-regulated ZCO samples have obtained by altering the concentration of precursors in the solvent. Effective strategic methods led to various regulated morphologies, as well as different physicochemical properties, such as the surface area/pore size/volume, crystalline nature, and non-stoichiometry of Zn and Co in the ZCO samples. The metal (Zn/Co)/O deficiencies have quantitatively estimated via X-ray photoelectron spectroscopy and confirmed by the Rietveld refinement of ZCO samples using X-ray diffraction data. A mechanistic study has performed to investigate the formation mechanism of the precursor concentration-dependent self-assembled ZCO microstructures. We demonstrate that the specific capacitance of ZCO has proportional to the Zn-deficiency/Co-excess. The Co-deficient-dependent electrochemical properties have studied for three samples and a decline in the following order: P-ZCO (1608.95 F g�1 at 0.35 A g�1) > S-ZCO (1007.48 F g�1 at 0.35 A g�1) > R-ZCO (629.05 F g�1 at 0.35 A g�1). The simple and inexpensive method of synthesized non-stoichiometric ternary metal oxides micro/nanostructures will introduce new directions in this emerging energy field. © 2020 Elsevier B.V.

Item Type:	Journal Article
Publication:	Applied Surface Science
Publisher:	Elsevier B.V.
Additional Information:	copy right for this article belongs to Elsevier B.V.
Keywords:	Microstructure; Physicochemical properties; Rietveld refinement; Supercapacitor; X ray photoelectron spectroscopy; Zinc compounds, Crystalline nature; Formation mechanism; Mechanistic studies; Micro/nanostructures; Precursor concentration; Solvothermal approach; Specific capacitance; X-ray diffraction data, Morphology
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	21 Dec 2020 11:36
Last Modified:	21 Dec 2020 11:36
URI:	http://eprints.iisc.ac.in/id/eprint/66038

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