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本文采用理论计算与实验数据相结合的方法探索了碳化钨(WC)催化剂在三种不同电解液中的电氧化机理。研究表明;在2.0mol.L~(-1)H_2SO_4电解液中,若电极电势大于800mv(vs.DHE),则电极表面上的碳化钨催化剂被氧化成W_2O_5,电氧化过程属1电子反应;在3.5mol.L~(-1)HCl中,电极表面上生成的产物为W_8O_(23),属1.75电子反应。在2.5mol.L~(-1)KOH电解液中,WC粉末的电氧化过程未经中间氧化态的变化一步就氧化成WO_3,为2电子氧化反应。
In this paper, the theoretical calculation and experimental data were combined to explore the tungsten carbide (WC) catalyst in three different electrolyte electro-oxidation mechanism. The results show that the tungsten carbide catalyst on the electrode surface is oxidized to W_2O_5 if the electrode potential is higher than 800mv (vs.DHE) in 2.0mol.L -1 H_2SO_4 electrolyte, and the electrooxidation is an electron reaction. In 3.5mol.L ~ (-1) HCl, the product formed on the electrode surface is W_8O_ (23), belonging to 1.75 electron reaction. In 2.5mol.L ~ (-1) KOH electrolyte, the electrooxidation of WC powder oxidized to WO_3 in one step without the change of the intermediate oxidation state, which was the second electron oxidation reaction.