【摘要】 文章研究了纳米TiO2掺杂活性炭(AC)复合物ACT(纳米TiO2掺杂活性炭的AC电极样品)作为超级电容器电极的电化学特性。实验结果表明, 对于具有n型半导体特性的TiO2掺杂AC,作为超级电容器正极材料时能够显著提高AC的储能能力,作为负极时却大大地降低了AC的储能能力。在超级电容器ACT电极中AC∶TiO2为6∶1时,其电极的比容量达到69.4 F·g-1,比纯AC电极的容量提高了约47 %。循环伏安扫描图表明该ACT电极的电化学行为依然为典型的双电层电容特性。掺杂前在350~750 ℃温度范围对纳米TiO2 进行处理有利于进一步提高ACT电极的储能容量。更多还原

【Abstract】 In this paper, electrochemical characteristics of supercapacitors based on the composites of activated carbon(AC) modified with nano-TiO2 were investigated. For the composites materials, when acted as the positive electrode the storage capacitance of AC obviously improved, but as the negative electrode the storage capacitance of AC greatly decreased. When the ratio of AC:TiO2=6:1, the capacitance of capacitor AC/ACT increased to 69.4 F·g-1, about 47% larger than the pure AC-based capacitor. The cyclic voltammograms show there is a typical double-layer characteristic at the capacitor behavior, a pure electrostatic attraction appearing in these capacitors, the same as the AC-supercapacitor. Before the modification of AC, heat treatment of nano-TiO2 helps to improve the capacitance of AC and the optimal treating temperature is 350-750 ℃.更多还原