【摘要】 采用浸渍焙烧法制备了氧化铅/碳纳米管复合材料(PbO/CNTs).运用准稳态极化曲线、循环伏安以及电化学阻抗谱等方法研究了铅物种的引入对CNTs复合材料抑制析氢反应及电催化全钒氧化还原液流电池(VRFB)负极反应活性的影响,并采用恒电流充放电法对铅碳复合材料作为负极催化剂时VRFB的充放电稳定性进行了评价.实验结果发现:1A/cm~2时,引入PbO后CNTs析氢电位从-0.962 8V负移至-1.149V,PbO/CNTs复合材料具有良好的抑制析氢反应能力;同时,PbO/CNTs复合材料也显示出了更好的电催化VRFB负极反应的活性.同等条件下,以PbO/CNTs为负极催化剂的VRFB充放电容量比以CNTs为负极催化剂时高100~200mAh,并具有更好的容量稳定性.更多还原

【Abstract】 The lead monoxide modified Carbon nanotubes composite(PbO/CNTs)was prepared by an impregnation-calcination method.The effects of the introduction of Pb species on the hydrogen evolution reaction and the electrocatalytic activity on the cathodic reaction of the all vanadium redox flow battery(VRFB)were investigated by quasi-steady-state polarization curve,cyclic voltammetry and electrochemical impedance spectroscopy. And the charge-discharge performance of the VRFB using PbO/CNTs as the electrocatalyst of negative electrode was evaluated by agalvano-static charge-discharge method.The experimental results show that the PbO/CNTs composite can effectively inhibit the hydrogen evolution reaction(HER)with negative shift of HER potential from-0.962 8 V to-1.149 V under 1 A/cm~2 after the introduction of Pb species onto CNTs. And the PbO/CNTs composite shows better electrocatalytic activity on the negative reaction of VRFB when compared with CNTs.In addition,the charge-discharge capacities of the VRFB using PbO/CNTs modified carbon felt as negative electrode are ca.100-200 mAh higher than that using CNTs modified carbon felt as negative electrode;and better capacity stability during the charge-discharge cycles can be observed as well.更多还原