碳化钨/碳气凝胶纳米复合材料增强Pt电催化甲醇性能的研究

以间苯二酚和甲醛为原料,采用溶胶-凝胶法原位合成WC纳米颗粒制备了碳化钨/碳气凝胶(WC/CAs);以WC/CAs为载体,利用微波加热乙二醇还原法制备了Pt/WC/CAs催化剂。运用循环伏安法(CV)、线性扫描(LSV)、计时电流法(CA)、能谱(EDS)、透射电子显微镜(TEM)和X射线衍射(XRD)等技术分析Pt/WC/CAs催化剂的组成、结构及其对甲醇的电催化氧化活性的影响。实验结果表明,载体中WC纳米颗粒的加入促进Pt贵金属颗粒对甲醇的电催化氧化活性,正扫电流峰ip与扫描速率的平方根v1/2线性相关,Pt/WC/C催化氧化甲醇的过程受扩散控制;且电催化活性比Pt/C要好。

Composite of Nanosized Tungsten Carbides and Carbon Aerogel Improving Pt Electrocatalysis Performance for Methanol

The nanosized tungsten carbides supported on carbon aerogel composites have been synthesized for the first time by a polycondensation of resorcinol and formaldehyde （ RF ） method in the presence of sodium tungstate. The nanocomposites are characterized by X - ray diffraction,transmission electron microscopy,energy dispersive X - ray spectroscopy（ EDS）and cyclic voltammetry. The Pt nanoparticles supported on tungsten carbide and carbon aerogel composites（Pt/ WC / C）for methanol oxidation are investigated. The Pt/ WC / C as electrocatalyst shows a superior activity toward the methanol oxidation which is almost two times higher than that of Pt/ C due to the synergistic effect between Pt and tungsten carbides. And the electrocatalysts of Pt/ WC / C is more duralable than the Pt/ C. This finding indicates that the tungsten carbide nanocomposites will be the novel potential catalyst support in the direct methanol fuel cells.