Reduced graphene oxide as a charge reservoir of manganese oxide: Interfacial interaction promotes charge storage property of MnOx-based micro-supercapacitors

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Reduced graphene oxide (rGO)-based micro-supercapacitors (MSCs) have emerged as a new type of micro-energy storage device. However, the low volumetric energy density of rGO hampers the application of MSCs in mini-aturized energy storage devices. Hybridization of pseudocapacitive materials with rGO is a potential approach to increase the energy density of MSCs. Herein, a densely packed hybrid film of birnessite-type manganese oxide (K-MnOx) supported by rGO is developed, and hybrid-film-based MSCs are found to show a high volumetric capacitance (490 F/cm(3)) that is & nbsp;similar to 1.2 and 19 times greater than those of rGO and K-MnOx-based MSCs, respectively. A semi-permanent cycle life with capacitance retention of 97% after 10,000 cycles is observed. Moreover, a charge reservoir concept is introduced, which explains the origin of the high pseudocapacitance of the K-MnOx/rGO hybrid in a unique way. It is observed that synergistic interaction among the charge reservoir (rGO) and electron transfer channel (K-MnOx, which becomes conductive at the interface) facilitates the charging and discharging of K ions, with minimum deviation of the Mn oxidation states. This new charge reservoir concept would serve as a stepping stone toward designing novel hybrid devices with high energy storage capabilities.
Publisher
ELSEVIER SCIENCE SA
Issue Date
2022-07
Language
English
Article Type
Article
Citation

CHEMICAL ENGINEERING JOURNAL, v.439

ISSN
1385-8947
DOI
10.1016/j.cej.2022.135569
URI
http://hdl.handle.net/10203/296381
Appears in Collection
MS-Journal Papers(저널논문)
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