期刊
ELECTROCHIMICA ACTA
卷 243, 期 -, 页码 119-128出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2017.05.064
关键词
Renewable Energy; Asymmetric supercapacitors; Batteries; Pseudocapacitors
资金
- Research and Innovation department of UMP [RDU 1503100, GRS 150342]
- Universiti Teknologi PETRONAS under YUTP-FRG (Cost Centre) [0153AA-E43]
This paper reports that addition of reduced graphene oxide (rGO) in MgCo2O4 improves the binding of Mg with Co thereby minimizing magnesium dissolution in aqueous alkaline electrolytes and the resulting MgCo2O4/rGO electrodes offered impressive improvements in charge storage properties. An isostructural high performing material, MnCo2O4, is used as a benchmark material in this work. The Mg analogues stored > 30% more charges than the Mn-analogues in the 3 M LiOH electrolyte despite the former's lower BET surface area; rGO modification further increased charge storage by > 60% than the unmodified analogues. Electrochemical measurements show that a larger surface fraction of the Mg analogue is electrochemically active, irrespective of whether or not rGO is present, which arise from, typically for MgCo2O4/rGO, lower internal resistance, lower Warburg impedance, and lower charge transfer resistance than the other electrodes. (C) 2017 Elsevier Ltd. All rights reserved.
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