W_xC/GC的离子交换-碳化制备及其载铂电化学性能

W_xC/GC Synthesis by an Ion-exchange Carbonization Method and Its Electrochemical Performance

以离子交换树脂为碳源,偏钨酸铵(AMT)为钨源和亚铁氰化钾(K_4Fe(CN)_6·3H_2O)为催化剂,采用离子交换法制备树脂基前躯体,在氮气气氛下高温还原同步碳化制备碳化钨/石墨碳(WxC/GC)复合物。以WxC/GC为载体,采用微波加热乙二醇还原法负载纳米铂(Pt)颗粒制备了Pt/WxC/GC催化剂。通过XRD、TG和SEM等测试技术分析了WxC/GC的形成过程及其形貌。并在酸性介质中测试Pt/WxC/GC的电催化性能。实验结果表明:制备的WxC/GC复合物颗粒细小,分散均匀,WxC粒径为2~30 nm。载质量分数10%Pt的Pt/WxC/GC在酸性介质中具有较好的电催化活性和稳定性,对甲醇的氧化电流密度峰值为39 mA·cm^(-2)。

A simple approach was proposed to fabricate tungsten carbides/graphitic carbon（WxC/GC） composites using ion-exchange resin as carbon resource,ammonium metatungstate（AMT） as tungsten source and the potassium ferrocyanide（K4Fe（CN）6·3H2O） as catalyst.The resin-based precursor was prepared via the ion-exchange method and underwent reduction and synchronous carbonization at high temperature under N2 atmosphere to fabricate WxC/GC composites.Furthermore,the WxC/GC supported platinum nanoparticle（Pt/WxC/GC） was prepared by a microwave-assisted polyol method.The crystalline phase,structure and morphology of samples were characterized with X-ray diffraction（XRD）,transmission electronic microscope（TEM） and energy dispersive X-ray spectroscopy（EDS）.The electro-catalytic activity of Pt/WxC/GC in acidic media was investigated using cyclic voltammetry.The results indicate that WxC particles are uniformly distributed in the as-synthesized WxC/GC composites with the size of 2-30 nm.Pt/WxC/GC with 10 wt% Pt exhibits attractive catalytic activity and stability,and the oxidation current density of methanol can reach 39 mA·cm^-2.