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Ternary Manganese Oxide Composite Electrodes to Harvest Enhanced Capacitive Performances via Successive Reaction Mechanism
Author(s) -
Su Linghao,
Ma Chuanli
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201802790
Subject(s) - ternary operation , electrode , composite number , materials science , cyclic voltammetry , oxide , manganese , capacitance , electrolyte , inorganic chemistry , electrochemistry , chemical engineering , chemistry , composite material , metallurgy , computer science , engineering , programming language
A strategy is proposed to harvest enhanced capacitive performances using successive reaction mechanism in ternary manganese oxide composite electrodes. Manganese oxide composite electrodes in KOH aqueous electrolyte with various weight ratio are studied by cyclic voltammetry and galvanostatic charge/discharge techniques. The results show that weight ratio in composite electrodes exerts great influence on capacitive behavior and that composite electrodes deliver higher specific capacitance than pure oxide ones. In MnO 2 /Mn 2 O 3 binary oxide electrodes, 1:1 is the optimal weight ratio. For MnO 2 /Mn 2 O 3 /Mn 3 O 4 ternary oxide electrodes, 1:1:2 electrode displays double capacitance of MnO 2 /Mn 2 O 3 electrode (1:1), benefiting from the successive reactions due to the variable valence of manganese element in the composite electrode.