Assembling a supercapacitor electrode with dual metal oxides and activated carbon using a liquid phase plasma. (1st December 2017)

• Record Type: Journal Article
• Authors: Ki, Seo Jin; Jeon, Ki-Joon; Park, Young-Kwon; Park, Hyunwoong; Jeong, Sangmin; Lee, Heon; Jung, Sang-Chul
• Is Part Of: Journal of environmental management. Volume 203:Part 3(2017)
• Page Start: 880
• Page End: 887
• Publication Date: 2017-12-01
• Subjects: Electrochemical capacitor -- Liquid phase plasma -- Dual metal oxides -- Equivalent series resistance -- Electrochemical performance -- Cyclic stability; Environmental policy -- Periodicals; Environmental management -- Periodicals; Environment -- Periodicals; Ecology -- Periodicals; 363.705
• DOI: 10.1016/j.jenvman.2017.05.008
• Languages: English
• ISSNs: 0301-4797

Abstract

Abstract: Developing supercapacitor electrodes at an affordable cost while improving their energy and/or power density values is still a challenging task. This study introduced a recipe which assembled a novel electrode composite using a liquid phase plasma that was applied to a reactant solution containing an activated carbon (AC) powder with dual metal precursors of iron and manganese. A comparison was made between the composites doped with single and dual metal components as well as among those synthesized under different precursor concentrations and plasma durations. The results showed that increasing the precursor concentration and plasma duration raised the content of both metal oxides in the composites, whereas the deposition conditions were more favorable to iron oxide than manganese oxide, due to its higher standard potential. The composite treated with the longest plasma duration and highest manganese concentration was superior to the others in terms of cyclic stability and equivalent series resistance. In addition, the new composite selected out of them showed better electrochemical performance than the raw AC material only and even two types of single metal-based composites, owing largely to the synergistic effect of the two metal oxides. Therefore, the proposed methodology can be used to modify existing and future composite electrodes to improve their performance with relatively cheap host and guest materials. Highlights: A novel composite was assembled using liquid phase plasma in a reactant solution. The effects of varying precursor concentrations and plasma duration were studied. Increasing metal levels and plasma duration led to the growth of metal oxides. The composite reduced the overall resistance while improving the cyclic stability. A synergistic effect was observed by inviting multiple oxides in the composite.