碳化钨在对硝基苯酚电还原过程中的电催化行为

The Catalytic Behavior of Tungsten Carbide for the Electroreduction of p-nitrophenol

以碳化钨(WC)粉末为电催化材料制成了碳化钨粉末微电极(WC-PME).采用循环伏安和线性扫描等方法研究了酸性溶液中对硝基苯酚(PNP)在WC-PME上的电还原行为.研究表明,在相同测试条件下,PNP在WC-PME上电还原的电位比Cu-Hg微电极正得多;WC-PME对氢具有较强的吸附能力,有利于有机物的电还原反应.PNP在WC-PME上和Pt微电极上的还原电位相近,但在WC-PME上的峰电流比在Pt微电极上高5倍多,这主要与WC粉末的结构形貌有关.

Tungsten carbide powder microelectrode (WC-PME) was prepared from tungsten carbide (WC) powders to be used as an electrocatalyst. Electrochemical reduction behaviour of p-nitrophenol (PNP) on the WC-PME was investigated using cyclic voltammetry(CV) and linear sweep voltammetry. It was found that reduction potential of PNP on the WC-PME was more positive than that on the Cu-Hg microelectrode and that WC had higher catalytic activity in the electroredution of PNP than Cu-Hg. Although the reduction potentials of PNP on the WC-PME and the Pt microelectrode were close to each other, the reduction current of PNP on the WC-PME was about 5 times as large as that on the Pt microelectrode. This result was mainly attributed to the surface morphological structure of WC.