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利用碳球为还原剂,在中性KMnO4溶液中制备出MnO2/碳球复合材料,并对其结构和电化学性能进行了研究。结果显示,随着碳球含量的增加,MnO2/碳球复合材料的循环稳定性提高,但比电容量降低;当碳球质量分数为35%时,MnO2/碳球复合材料的比电容量在50 mA/g的电流密度下达到181 F/g。分别采用KOH活化和混酸氧化的碳球为还原剂,可以有效地提高MnO2/碳球复合材料的比电容量和循环稳定性,相应复合材料的比电容量分别达到192 F/g和218 F/g,而且经过500次的充放电测试,仍然保持为184 F/g和192 F/g。
The use of carbon balls as a reductant in the neutral KMnO4 solution prepared MnO2 / carbon ball composite, and its structure and electrochemical properties were studied. The results show that the cyclic stability of MnO2 / carbon sphere composites increases with the increase of carbon content, but the specific capacitance decreases. When the mass fraction of carbon spheres is 35%, the specific capacitance of MnO2 / The current density at 50 mA / g reached 181 F / g. The specific capacitance and cycling stability of MnO2 / carbon spheres composites were improved by using KOH-activated and mixed-acid carbon spheres as reductants, respectively. The specific capacitance of the composites reached 192 F / g and 218 F / g, and remained at 184 F / g and 192 F / g after 500 charge and discharge tests.