碳化钨增强Pt/C电催化剂上的析氢反应

Hydrogen evolution reaction on tungsten carbide promoted Pt/C electrocatalysts

研究了碳化钨(WC)增强Pt/C(Pt-WC/C)作为析氢反应的电催化剂,结果显示:Pt-WC/C电催化剂的催化析氢性能比Pt/C电催化剂高。当电流密度为200 mA/cm2时,在载有120μg Pt-120μg WC/C电催化剂的电极上比载有240μg Pt/C电催化剂的电极上过电位降低了将近60 mV;Pt-WC/C电催化剂中使用较少的Pt,但催化活性有了很大的提高。提高H2SO4浓度和温度,都能提高析氢性能。动力学研究表明:Pt-WC/C电催化剂上的催化析氢反应比在Pt/C电催化剂上有更大的交换电流密度和更小的反应活化自由能。

Tungsten carbide （WC） crystal promoted Pt/C （Pt-WC/C） as electrocatalyst of the hydrogen evolution reaction （HER） was analyzed, The results showed that the catalytic hydrogen evolution reaction performance of Pt-WC/C electrocatalyst was significantly improved compared to the Pt/C electrocatalyst, When the current density was 200 mA/cm2 , the overpotential on the electrode loading 120 μg Pt-120 μg WC/C was lower about 60 mV compared to the electrode loading 240 μg Pt/C electrocatalyst. The catalytic activity of Pt-WC/C electrocatalyst was enhanced significantly by using less Pt. The hydrogen evolution performance could be enhanced by increasing H2SO4 concentration and the operating temperature. Kinetic study showed that the HER on the Pt-WC/C electrocatalyst had higher exchange current density and lower reaction activation free energy than that on the Pt/C electrocatalyst.