摘要
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 Ni_2O_3 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 3000 A).The results show that Ni-C powders can be fabricated by reduction of Ni_2O_3 with PE after its melting.Nickel content in solid residue rises with increase of Ni_2O_3 content in mixtures.Higher temperature favors agglomeration of nickel powders.Ni-C powder obtained from PE/Ni_2O_3=1/3 at 1 073 Kexhibits superior catalytic property to Pt plate.Good stability of catalytic performance remains after 1 000 cycles of cyclic-potential test.
引文
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