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用浓硫酸、浓硝酸对石墨进行氧化处理,在水浴条件下再将其与高锰酸钾反应,制得插层石墨/四氧化三锰(Mn_3O_4)复合电极材料。并对材料的形貌、结构和电化学进行表征和分析。研究结果表明,水浴回流制备的插层石墨/Mn_3O_4复合材料,具有类石墨结构,呈针状,比表面积大,具有优异超级电容性能。恒流充放电表明,插层石墨/Mn_3O_4复合材料比/Mn_3O_4具有较大的电流放电能力,在1.0A/g电流密度下,插层石墨/Mn_3O_4复合材料比电容为242F/g,Mn_3O_4比电容为112F/g,插层石墨/Mn_3O_4复合材料的比电容比Mn_3O_4高116%。在电流密度0.1A/g时,插层石墨/Mn_3O_4复合材料的比电容为328F/g。
Graphite is oxidized with concentrated sulfuric acid and concentrated nitric acid, and then reacted with potassium permanganate under a water bath to obtain an intercalated graphite / manganese trioxide (Mn_3O_4) composite electrode material. The morphology, structure and electrochemical properties of the materials were characterized and analyzed. The results show that the intercalated graphite / Mn_3O_4 composites prepared by water bath reflow have the graphite-like structure with acicular shape and large specific surface area, and have excellent supercapacitor properties. The charge / discharge of constant current shows that the intercalated graphite / Mn_3O_4 composite has larger current discharge capacity than Mn_3O_4 composite. The specific capacitance of the intercalated graphite / Mn_3O_4 composite is 242F / g at the current density of 1.0A / g, and the Mn_3O_4 specific capacitance 112F / g, intercalated graphite / Mn_3O_4 composite material than the Mn_3O_4 116% higher than the capacitance. The specific capacitance of intercalated graphite / Mn_3O_4 composites is 328F / g at a current density of 0.1A / g.