【摘要】 以低温固相反应法制备 Mn O2 及该材料化学掺杂 Fe3 + ,获得的电极材料借助 X射线衍射、扫描电镜测试对其物理性质作了表征。以 Mn O2 作为超级电容器电极材料的单电极活性物比电容为 3 1 1～ 1 49F/g,掺杂 Fe3 +的电极材料比电容为 3 1 8～ 1 1 4F/g(电流密度 5 0～ 1 0 0 0 m A/g)。由这些材料制得的超级电容器的比能量分别为 2 7.6～ 9.95 W·h/Kg和 2 8～ 1 0 W· h/Kg。从充放电曲线可见 ,化学掺杂的配比对电化学性能的影响较大 ,掺杂量为 n(Mn)∶ n(Fe) =1 0∶ 1时 ,材料具有良好的放电性能 ,而其它配比对 Mn O2 的包覆起到了钝化膜的作用。从 1 0 0 0次的循环性能看 ,在电流密度为 1 0 0 0 m A/g时 ,掺杂 Mn O2 比未掺杂的具有较好的循环性 ,二者的比电容分别衰减到 90 %和 70 % ,表明化学掺杂 Fe3 + 有利于提高 Mn O2 电极的放电性能和循环性更多还原

【Abstract】 MnO 2 and Fe 3+ doped MnO 2 used as electrode materials were prepared by solid state reaction and characterized by XRD and SEM. The latter showed better electrochemical performances. The specific capacitances of pure MnO 2 and iron doped MnO 2 were 311~149 F/g and 318~114 F/g(mass of single electrode active matter), respectively, at current density of 50~1 000 mA/g. The specific energy values of supercapacitors fabricated by these materials were 27 6~9 95 W·h/Kg and 28~ 10 W·h/Kg , respectively. It appeared that the ratio of Fe 3+ in samples had greater effect on the electrochemical capacity. The better discharge capacity could be obtained when the mole ratio of Mn(Ⅳ) to Fe(Ⅲ) was 10. The capacitors consisted of modified MnO 2 was more stable in cycling than those made of MnO 2 and their specific capacitance after 1 000 cycles decreased to 90% and 70%, respectively , at current density 1 000 mA/g.更多还原