聚丙烯还原氧化镍制备Ni-C微粉催化电极材料的研究

Fabrication of Ni-C Micro Powders as Electro-catalyst from Reduction of Nickel Oxide by Polypropylene

利用聚丙烯(PP)与氧化镍(NiO)粉末混合物(质量比1∶2.3~1∶2.7)在氩气气氛下加热制备Ni-C微粉析氢电极催化材料。重点探究质量比对Ni-C微粉制备过程及其催化性能的影响。采用同步热分析仪(TG-DSC)监测反应过程,利用XRD和SEM-EDS确定反应固相产物的物相组成及微观形貌,析氢催化性能及稳定性由电化学工作站(Parstat 3000A)测试获得。结果表明,混合粉末在加热过程中PP发生熔化和裂解反应,其裂解产物还原NiO。当温度高于1073K时,固相产物由镍、碳单质组成。固相产物中镍单质的含量随初始NiO含量的增加而增大。由PP∶NiO=1∶2.6及1∶2.7两样品制备的Ni-C微粉在高过电位下以及低过电位下均拥有较好的析氢效果及稳定性,1000次循环伏安测试后仍保持了良好的析氢催化效果。

Ni-C micro powders as electro-catalyst for hydrogen evolution were fabricated from mixtures of polypropylene(PP)and NiO(mass ratio from 1∶2.3 to 1∶2.7)by heating in Ar to 1073 K.TG-DSC was employed for monitoring pyrolysis of PP+NiO mixtures,and XRD and SEM-EDS were utilized for analyzing composition and morphology of solid products of PP+NiO pyrolysis.Catalytic property of asobtained solid pyrolysis products was tested by electrochemical workstation(Parstat 3000 A).The results show that PP decomposes when heated and its decomposition products can reduce NiO,resulting in final solid products of Ni-C micro powders at 1073 K,in which nickel content rises with increasing of initial NiO content in PP+NiO mixtures.Ni-C micro powders from pyrolysis of PP∶NiO=1∶2.6 and 1∶2.7 exhibit the best catalytic performance and reliable stability under high over potential and low over potential.Good stability of catalytic performance can be observed after 1000 cyclic voltammetry tests.