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Highly atom-efficiency synthesis of MnO_2 nanosheets for supercapacitors

Xu Jiangsheng;Xia Qing;Shao Zongming;Wang Kai;School of Chemistry and Chemical Engineering,Hefei University of Technology;  
A large amount of wastewater containing a large amount of Mn ion is produced by Hummer′s method,which is one of most frequently used methods to prepare graphite oxide.Mn3O4 nanoparticles and MnO_2 nanosheets were synthesized respectively by a facile treatment of the wastewater containing Mn2+by KOH solution.The electrochemical performance of MnO_2 nanosheets as the electrode materials was tested.Results showed that the specific capacitance of MnO_2 nanosheets electrode could reach 315.0 F/g at 0.1 A/g.And the specific capacitance retention at a current density of 1 A/g for MnO_2 nanosheets could retain 93.3% of the initial capacitance after 1 000 cycles.Obviously,a highly atom-efficiency strategy was showed for preparation of supercapacitor electrode materials with high performance by a facile treatment of the wastewater and the harm of waste liquid discharge was greatly reduced at the same time.
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