Preparation of Pt supported on WO3–C with enhanced catalytic activity by microwave-pyrolysis method
Preparation of Pt supported on WO3–C with enhanced catalytic activity by microwave-pyrolysis method
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DOI：
10.1016/j.jpowsour.2009.11.055
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发表时间：
2010-05
影响因子：
9.2
通讯作者：
Jilei Ye;Jianguo Liu;Z. Zou;Jun Gu;Tao Yu
中科院分区：
文献类型：
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作者：
Jilei Ye;Jianguo Liu;Z. Zou;Jun Gu;Tao Yu
以钨酸铵为前驱体，采用间歇式微波热分解法制备了WO 3-C杂化材料，然后采用微波辅助多元醇法在WO 3-C上沉积了Pt纳米粒子。TEM图像显示了碳负载的纳米级WO 3颗粒和负载在WO 3-C上的纳米级Pt金属微晶的分散性。XRD结果表明，WO 3为单斜晶相，用EDAX进一步表征了WO 3/C和Pt/WO 3-C催化剂中WO 3的含量。XPS表征表明，在200°C热处理后，Pt与WO 3之间的相互作用显著增强。采用循环伏安法、CO溶出法和计时孔径法比较了Pt/WO 3-C和Pt/C在酸性溶液中对甲醇的电化学氧化活性。200 ℃焙烧的Pt/WO 3-C催化剂对甲醇的电氧化活性最高，CO电氧化负电位比未热处理的Pt/C和Pt/WO 3-C高60 mV。热处理后Pt/WO 3-C催化剂中Pt和WO 3之间的协同效应得到改善，这可能是催化剂电化学性能显著提高的原因。
The WO3–C hybrid materials are prepared by intermittently microwave-pyrolysis using ammonium tungstate as the precursor, and then Pt nano-particles are deposited by microwave-assited polyol process on WO3–C. The TEM images show the dispersion of ∼10nm WO3particles size supported on carbon and ∼3nm Pt metal crystallites supported on WO3–C. XRD results illustrate that WO3presented as monoclinic phase and the content of WO3in WO3/C and Pt/WO3–C catalysts is further characterized by EDAX. Furthermore, XPS characterizations indicate that the interaction between Pt and WO3is dramatically enhanced after heat treatment at 200°C. The activities of Pt/WO3–C for the electrochemical oxidation of methanol are compared with Pt/C in acid solution by cyclic voltammetry, CO-stripping and chronoaperometry. Pt/WO3–C catalyst calcined at 200°C exhibits the highest activity per electrochemical active surface area for methanol oxidation and is 60mV more negative for CO electro-oxidation than that of Pt/C and Pt/WO3–C without heat treatment. The great enhancement of electrochemical performance may be due to the improvement of the synergistic effect between Pt and WO3in Pt/WO3–C catalyst after heat treatment.