Journal
MATERIALS LETTERS
Volume 266, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.matlet.2020.127500
Keywords
Ceramics; Sol-gel preparation; Ceria; Zirconium doping; Supercapacitor; Electrode cyclability
Funding
- Ministry of Electronics and Information Technology, India [ELE1819353MEITNAK]
- Department of Science and Technology, India [MET1617146DSTXTIJU, YSS/2015/001712, DST 11-IFA-PH-07, DST/TMD/SERI/HUB/1(C)]
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The scales at which energy storage is required, to enable transition to a renewable energy economy, is truly formidable. This is, in fact, one of the most significant challenges to the movement towards a sustainable future. Hence working with well distributed (even earth abundant) materials for energy storage is reasonable. Ceria is among the rare earth oxides that are rather well distributed; furthermore, it also shows promising redox behavior. However, there is an obvious need for improving its supercapacitive behavior. Here, we explore the role of isovalent (4+) substitution of Zr to enhance the supercapacitive behavior of ceria (CeO2). This is the first report on the effect of Zr-incorporation in ceria on Ni-foam for supercapacitors. Electrochemical study demonstrates similar to 16.5% increase in maximum specific capacitance and similar to 17% increase in energy density for Zr-incorporated ceria (Ce0.9Zr0.1O2) compared to its undoped counterpart in 2 M KOH electrolyte. Importantly Ce0.9Zr0.1O2 exhibits high cyclic stability of 93% after 2000 charge-discharge cycles at a high current density of 10 A g(-1). (C) 2020 Elsevier B.V. All rights reserved.
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