In this paper,dried lotus leaves were used as raw materials,and lotus leaf-based biomass active carbon with high chemical stability,good conductivity and high specific surface area was obtained through low temperature dehydration,high temperature carbonization and activation.Then a series of new lotus leaf-based active carbon-bismuth oxide nanocomposites were prepared by hydrothermal method.The effects of activation temperature of lotus leaf activated carbon and solvothermal reaction temperature on the behavior of the pseudapacitor of a new supercapacitor composed of lotus leaf activated carbon-bismuth oxide nanocomposite were studied by electrochemical method.The results show that the mass specific capacitance of the novel lotus leaf-based activated carbon-bismuth oxide nanocomposite increased rapidly firstly and then decreases slightly with the increase of the activation temperature of lotus leaf-based activated carbon-bismuth oxide nanocomposite.The pseudocapacitive performance of nanocomposite was the best when the activation temperature of lotus leaf-based activated carbon was 600 degrees Celsius,which mass specific capacitance was 340.6 F·g-1(voltage scan rate was 5 mV·s-1);The mass specific capacitance of nanocomposites increased firstly and then decreases with the increase of the solvothermal reaction temperature.The pseudo capacitance of the lotus leaf active carbon-bismuth oxide nanocomposites prepared at the solvothermal reaction temperature of 170 degrees Celsius was the best,which mass specific capacitance is 536.3 F·g-1(current density is 1 A·g-1).
关键词
荷叶基活性炭/氧化铋/溶剂热法/赝电容/超级电容器
Key words
lotus leaf-based active carbon/bismuth oxide/solvothermal method/pseudo-capacitance/supercapacitor
维普
万方数据