Fast synthesis of δ-MnO2 for a high-performance supercapacitor electrode

被引：54
作者：
de Oliveira Cremonezzi, Josue Marciano [1 ,2 ]
Tiba, Daniel Yaezu [1 ,2 ]
Domingues, Sergio Humberto [1 ,2 ]
机构：
[1] Univ Prebiteriana Mackenzie, MackGraphe Graphene & Nanomat Res Ctr, Rua Consolacao 896, BR-01302907 Sao Paulo, SP, Brazil
[2] Univ Prebiteriana Mackenzie, Mackenzie Sch Engn, Sao Paulo, SP, Brazil
来源：
SN APPLIED SCIENCES | 2020年 / 2卷 / 10期
基金：
巴西圣保罗研究基金会;
关键词：
Delta manganese dioxide; Nascent hydrogen; Energy storage; Electrochemical capacitor; MNO2; NANOSHEETS; MANGANESE OXIDE; HYDROTHERMAL SYNTHESIS; NANOSTRUCTURES; MECHANISM; CAPABILITY; OXIDATION; GRAPHENE; SPECTRA; GROWTH;
D O I：
10.1007/s42452-020-03488-2
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
We report a very simple and fast route for a high capacitive birnessite type manganese dioxide (delta-MnO2) synthesis, fully suitable to be applied as electrode in redox-based electrochemical supercapacitors. The material was obtained from a very efficient chemical reduction of potassium permanganate by nascent hydrogen in low temperature acid media. delta-MnO2 was extensively characterized by several techniques confirming the obtainment through the proposed route. The supercapacitive properties of the novel structure were evaluated showing a specific capacitance of 190 F g(-1) at 0.25 A.g(-1). In addition, to the best of our knowledge, this is the first report regarding the chemical synthesis of delta-MnO2 with no dependence of hazardous reducing agent, high temperature or high pressure commonly used to metal oxides production.
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页数：9
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