摘要
以钨酸和丙烯腈为原料,采用共沉淀法合成碳化钨(WC)前驱体,于H_2和Ar混合气氛中高温还原碳化制备纳米WC。采用傅立叶红外光谱、X射线衍射及扫描电镜等对试样进行表征,在酸性介质中采用循环伏安法测试Pt/WC电化学催化活性。结果表明,实验合成了较纯的纳米碳化钨,其颗粒形貌近似球形,粒径80 nm左右。Pt/WC的电化学表面积(ESA)较传统的Pt/C有较大提高,10%Pt/WC电流密度为51.2 mA·cm^(-2)。
The precursor of tungsten carbide was synthesized by co-precipitation method using acrylonitrile and tungstic acid as the starting material. Nano-sized tungsten carbide （WC）was prepared by reduction and carbonization in H2-Ar atmosphere at high temperature and characterized by FTIR, XRD and SEM. The electro-catalytic properties of Pt/WC in acidic media were investigated using cyclic voltammetry. The results showed that the as-synthesized WC particles with high purity were approximately spherical with diameter of 80 nm; the electro-chemical surface area（ESA） of Pt/WC was much higher than conventional Pt/C; the current density for 10wt%Pt/C was 51.2 mA · cm^-2
出处
《工业催化》
CAS
2009年第5期37-40,共4页
Industrial Catalysis
关键词
能源化学
燃料电池
纳米碳化钨
循环伏安法
电催化剂
电化学表面积
energy chemistry
fuel cell
tungsten carbide nanoparticle
cyclic voltammetry
electro-catalyst
electro-chemical surface area
