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

被引：0
作者：
Josué Marciano de Oliveira Cremonezzi
Daniel Yaezu Tiba
Sergio Humberto Domingues
机构：
[1] Mackenzie Presbyterian University,MackGraphe – Graphene and Nanomaterials Research Center
[2] Mackenzie Presbyterian University,Mackenzie School of Engineering
来源：
SN Applied Sciences | 2020年 / 2卷
关键词：
Delta manganese dioxide; Nascent hydrogen; Energy storage; Electrochemical capacitor;
D O I：
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摘要：
We report a very simple and fast route for a high capacitive birnessite type manganese dioxide (δ-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. δ-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 δ-MnO2 with no dependence of hazardous reducing agent, high temperature or high pressure commonly used to metal oxides production.
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