Morphology and Crystal Planes Effects on Supercapacitance of CeO2 Nanostructures: Electrochemical and Molecular Dynamics Studies

Aadithya Jeyaranjan, Tamil Selvan Sakthivel, Marco Molinari, Dean C. Sayle, Sudipta Seal

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Nano cerium oxide (CeO2) is a promising supercapacitor material, but the effect of morphology on charge storage capacity remains elusive. To determine this effect, three different morphologies, nanorods, cubes, and particles are synthesized by a one-step hydrothermal process. Electrochemical evaluation through cyclic voltammetry and galvanostatic charge–discharge techniques reveals specific capacitance to be strongly dependent on the nanostructure morphology. The highest specific capacitance in nanorods (162.47 F g−1) is due to the substantially larger surface area relative to the other two morphologies and the predominant exposure of the highly reactive {110} and {100} planes. At comparable surface areas, exposed crystal planes exhibit a profound effect on charge storage. The exposure of highly reactive {100} planes in nanocubes induce a greater specific capacitance compared to nanoparticles, which are dominated by the less reactive {111} facets. The experimental findings are supported by reactivity maps of the nanostructures generated by molecular dynamics simulations. This study indicates that supercapacitors with higher charge storage can be designed through a nanostructure morphology selection strategy.

Original languageEnglish
Article number1800176
Number of pages9
JournalParticle and Particle Systems Characterization
Volume35
Issue number10
Early online date9 Aug 2018
DOIs
Publication statusPublished - Oct 2018

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