纳米Pb(PbO)/活性炭的制备及其在H_2SO_4电解液中的电化学行为

Preparation and Electrochemical Behavior in H_2SO_4 Electrolyte of Nano-Pb(PbO)/Activated Carbon

通过对活性炭依次进行Pb（II）吸附、PbO沉积、还原分解等处理，制备了nano—Pb（PbO）／活性炭复合材料。采用XRD、EDS、SEM等手段对其进行了物相及微观结构表征，结果发现，纳米级Pb、PbO颗粒均匀地分布在活性炭表面。将该复合材料制备成电极，置于H2S04溶液中进行电化学性能测试分析，结果表明，nano—eb（PbO）／活性炭具有较高的析氢过电位、良好的导电性，并能提供一定的氧化还原电流，且非法拉第比容量损失较小。在铅酸电池负极铅膏中添加5wt％的nano．eb（PbO）／活性炭制备成相应铅炭超级电池，在电池放电至60％荷电状态（SOC）时进行高倍率循环实验，结果发现，其循环寿命相比于普通铅酸蓄电池提高了4～5倍。

Nano-Pb（PbO）/activated carbon （nano-Pb（PbO）/AC） was prepared by the processes of adsorption of Pb2＋, deposition of PbO and further reductive decomposition in the pores of activated carbon. The composite was character- ized by X-ray diffraction （XRD）, scanning electron microscope （SEM） and energy dispersive spectroscopy （EDS）. The results showed that Pb and PbO nano-crystals were dispersed uniformly on the surface of activated carbon particles. The electrochemical measurements in H2SO4 aqueous solution showed that nano-Pb（PbO）/AC possessed high over-potential of hydrogen evolution, high electrical conductivity, and could provid a certain degree of oxida- tion-reduction current. Moreover, there was less non-faradic capacitance loss. Ultra-battery was prepared by adding 5wt% of Nano-Pb（PbO）/AC to the negative paste. Initially, the battery was discharged to 60%SOC and then subjected to the test of cycling performance at high rate. The cycle life of the ultra-battery was 4 to 5 times higher than that of traditional lead-acid battery.