摘要
以新制备的过氧钨酸和酚醛树脂为原料合成碳化钨(WC)前驱体,分别以H_2和Ar为还原及保护气体,原位碳化制备纳米WC粉体。使用FTIR、XRD及SEM对试样的理化特性进行表征,并采用循环伏安法测试Pt/WC复合材料的电化学催化活性及其稳定性。结果表明,实现了低温原位碳化制备纯度高的纳米WC粉体,粉体颗粒粒径为15～100nm,颗粒形貌近似球形。WC可与Pt协同作用加强H_2的电催化氧化作用,10%Pt/WC(质量分数)展现了较好的催化稳定性和活性,其电流密度可达49.58mA/cm^2。
Using precursor which is synthesized from the reaction with newly-made peroxotungstic acid and phenol resin as raw materials, the nano-tungsten carbide particles are prepared by the in-situ carbonization method in the mixed atmosphere of H2 and Ar as reducing gas and shielding gas, respectively. Fourier transform infrared spectroscopy（FTIR）, XRD and SEM are used to characterize the samples. Then the electro-catalytic properties and electrochemical stability of Pt/WC are investigated by cyclic vohammetry. The results show that the pure nano-sized WC particles are synthesized by in-situ carbonization method at relative low temperature. Besides, the particles are approximately spherical, distributing with the size of 15-100nm. WC improves hydrogen oxidation reaction by co-interacting with Pt. 10wt%Pt/WC exhibits attractive catalytic stability and activity, the current density can reach 49. 58mA/cm^2.
