聚3,4-乙烯二氧噻吩/石墨烯/钛电极的制备及其电化学性能

采用直流电弧等离子体喷射化学气相沉积法把石墨烯生长在钛(Ti)基底上,并采用电化学氧化聚合法在石墨烯表面沉积聚3,4-乙烯二氧噻吩(PEDOT),由此构造PEDOT/石墨烯/Ti电极。形貌及结构表征结果表明,电聚合200圈以上的PEDOT呈线状或泡沫状且均匀分布于石墨烯表面。电化学性能测试结果表明,PEDOT/石墨烯/Ti电极具有高的比电容和库伦效率;其电聚合次数为400圈时,与PEDOT/Ti电极相比,比电容提高42倍,其最大电势窗口可达1.4 V,而在0～1.2 V电势窗口范围内,扫描速度为10 mV·s-1时,比电容可达到269.6 mF·cm-2。

Preparation and Electrochemical Properties of Poly(3,4-ethylenedioxothiophene)/Graphene/Ti Electrode

Poly(3,4-ethylenedioxothiophene) (PEDOT)/graphene/Ti electrodes were synthesized via the two-step method. The graphene was grown on Ti substrate by the direct current arc plasma jet chemical vapor deposition technique, and PEDOT was deposited on the surface of graphene by electrochemical oxidation polymerization. The PEDOT layers with nanowires or foam morphologies were synthesized by adjusting the polymerization cycles. The fabricated PEDOT/graphene/Ti electrodes demonstrated high specific capacitance and good coulombic efficiency in 0.1 mol·L^-1 KCl electrolyte. The maximum potential window of the 400-cycle PEDOT/graphene/Ti electrode was 1.4 V. The specific capacitance calculated from the CV curve at a scan rate of 10 mV·s^-1 was about 269.6 mF·cm^-2 (0 to 1.2 V). The specific capacitance of the 400-cycle PEDOT/graphene/Ti electrode was calculated to be 42 times larger than the PEDOT/Ti electrode.