期刊
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
卷 35, 期 10, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ppsc.201800176
关键词
cerium oxide; crystal plane effects; energy storage; molecular dynamics simulations; supercapacitors
资金
- EPSRC [EP/R010366/1, EP/H001220/1, EP/H005838/1]
- EPSRC [EP/H001220/1, EP/H005838/1, EP/R010366/1] Funding Source: UKRI
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.
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