酸性电解液中活性碳化钨的电化学阳极行为

The Anodic Behaviour of Active Tungsten Carbide in Acidic Electrolytes

本文论述活性碳化钨(WC)在酸性电解液中的电化学阳极行为。从实验结果表明:当电极电势低于800mV(vs.D.H.E.)时,碳化钨粉末对氢具有较强的吸附能力,体系中除氢离子化(HIR)外,碳化钨电极表面上来发生其它电氧化反应,具有较好的电催化活性和电化学稳定性,若电势大于800mV,碳化钨电极表面上将出现氧的吸附过程,碳化钨粉末开始发生电氧化反应,生成不稳定蓝色氧化钨;当电势高于1400mV时,碳化钨电极表面上氧吸附能力增强,碳化钨粉末进一步氧化成稳态氧化钨,且发生析氧或析氯反应。

This paper deals with the anodic behaviour of the embedded electrode of active tungsten carbide (WC) in acidic electrolytes. The results show that WC catalyst powder exhibits better electrocatalytic activity and electrochemical stability to the hydrogen ionization reaction (HIR), and no oxide is formed on the electrode surface if the potential is less than 800mV (vs.D. H. E.). When the potential is higher than 800rnV, the oxygen surface is adsorbed by electrode surface WC powder itself takes part in an electrochemical oxidation reaction, and the unstable blue oxide is formed on electrode surface. If the potential is over 1400mV, the ability for electrode surface to adsorb oxygen is enhanced the stable yellow oxide is formed on the electrode surface and appears the reaction of oxygen evolution in 2.0 mol·dm-3 H2SO4 or the reaction of chlorine evolution in 3.5 mol·dm-3 HC1.