多孔球状Mn3O4的制备及电容特性研究

Preparation of Porous Spherical Mn3O4 and Its Capacitance Characteristics

通过精确控制葡萄糖的摩尔反应比,采用水热结合低温烧结法制备了多孔球状黑锰矿结构Mn3O4。当高锰酸钾与葡萄糖比例为1∶3(MNO-3)时,具有最优性能。SEM结果显示最优样品具有多孔球状结构,粒径大小均匀,约为1~4μm。运用恒流充放电、交流阻抗、循环伏安等电化学测试方法研究其电容特性和电化学性能。结果表明:在6 mol·L-1KOH电解质溶液中,电流密度为1 A·g-1的条件下MNO-3样品具有最高比容量321.7 F·g-1,循环400圈后,其比容量保持率为97.15%。

Porous spherical black manganous-manganic oxide was prepared by precisely controlling the content of glucose using hydrothermal method combined with low-temperature sintering.The product results excellent properties with the rate of potassium permanganate and glucose is 1∶3(MNO-3).SEM results reveal that the size of the optimal porous spherical sample is uniform and its average diameter is about 1-4μm.The electrochemical performances of the as-obtained samples were measured using GC,EIS and CV techniques.Electrochemical results show that MNO-3 possesses the highest specific capacity of 321.7 F·g^-1 at a current density of 1 A·g^-1 tested by a three-electrode system in 6 mol·L^-1 KOH electrolyte.Furthermore,MNO-3 electrode presents excellent cycle stability with high capacitance retention of 97.15%after 400 cycles.