聚乙烯还原氧化镍制备Ni-C微粉析氢催化剂的研究

Preparation of Ni-C Powder as Hydrogen Evolution Catalyst by Reduction of Ni_2O_3 with PE

利用聚乙烯(PE)与Ni_2O_3混合后在氩气气氛下反应制备Ni-C微粉。探究质量混合比与反应温度对Ni-C微粉生成及性能的影响。采用同步热分析仪(TG-DSC)监测反应过程,Ni-C微粉的物相组成和微观形貌由XRD和SEM-EDS确定,Ni-C微粉析氢催化性能由电化学工作站测试(Parstat 3000A)。研究表明,PE与Ni_2O_3混合物在加热过程中PE熔化后与Ni_2O_3反应。温度高于1 073K条件下,固相产物由镍、碳单质组成。固相产物的镍含量随样品中Ni_2O_3含量升高而升高;温度升高使镍单质的团聚程度增大。样品PE/Ni_2O_3=1/3在1 073K下所得Ni-C微粉优于铂片的析氢催化性能,低于铂片电极的过电势。在1 000次循环伏安测试后仍保持了良好的析氢催化效果。

Ni-C powder was prepared by heating homogeneous mixtures of PE and Ni2O3 under Ar atmosphere.Effects of mixing ratio and temperature on formation and properties of Ni-C powder were investigated.Heating process was monitored by thermo-gravimetry coupled with differential scanning calorimeter (TG-DSC).Phase composition and microstructure of Ni-C powder were characterized by XRD and SEM-EDS.Catalytic ability of Ni-C powder for hydrogen evolution reaction (HER) was studied by electrochemical workstation (Parstat 3000A).The results show that Ni-C powders can be fabricated by reduction of Ni2O3 with PE after its melting.Nickel content in solid residue rises with increase of Ni2O3 content in mixtures.Higher temperature favors agglomeration of nickel powders.Ni-C powder obtained from PE/Ni2O3=1/3 at 1 073 K exhibits superior catalytic property to Pt plate.Good stability of catalytic performance remains after 1 000 cycles of cyclic- potential test.