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首页> 外文期刊>International Journal of Electrochemical Science >A Novel Pt/WCx/C Electrocatalyst Synthesized by a One-Pot Method for Methanol Electrooxidation in Acid Media
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A Novel Pt/WCx/C Electrocatalyst Synthesized by a One-Pot Method for Methanol Electrooxidation in Acid Media

机译：通过一锅法合成的新型Pt / WC x / C电催化剂在酸性介质中甲醇电氧化

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The development of new electrocatalysts with low platinum (Pt) loading and high electrochemicalactivity is still a challenge for fuel cell technologies. In this work, novel electrocatalysts, Ptnanoparticles alloyed with tungsten carbide (WC) supported on nanocarbon materials(Pt/WCxanocarbon), were synthesized by a newly developed one-pot method for the methanoloxidation reaction (MOR) in direct methanol fuel cells (DMFCs). The so-called one-pot method hastwo key steps. First, Pt-containing ligands and W-containing ligands were self-assembled onnanocarbon materials, namely, carbon nanotubes or carbon black. Second, the products obtained fromthe first step were freeze-dried. The composition and structure of the Pt/WC x anocarbonelectrocatalysts were characterized by several testing means, such as X-ray diffraction, field emissionscanning electron microscopy, transmission electron microscopy, and X-ray photoelectronspectroscopy. The results showed that Pt and WC were alloyed when their ratio was in an appropriaterange. The electrochemical performances for the MOR were evaluated by cyclic voltammetry andchronoamperometry in acid media. The results showed that the Pt/WC 0.15 /C electrocatalyst displayedthe highest electrocatalytic activity and the best stability for MOR. The enhancements inelectrochemical performance are attributed to the negative shift of the d-band centre of elemental Pt,which can weaken the adsorption strength towards CO molecules, facilitate the removal of the COgroups and improve MOR activity. The newly developed one-pot method has a great deal of potentialfor synthetizing Pt and carbide nanocomposite electrocatalysts and demonstrates a broad prospect inthe application of fuel cells.
机译：具有低铂（Pt）负载和高电化学活性的新型电催化剂的开发仍然是燃料电池技术面临的挑战。在这项工作中，通过新开发的一锅法在直接甲醇燃料电池中进行甲醇氧化反应（MOR），合成了新型电催化剂，即负载在纳米碳材料（Pt / WCx /纳米碳）上的与碳化钨（WC）合金化的铂纳米颗粒（ DMFC）。所谓的一锅法有两个关键步骤。首先，将含Pt的配体和含W的配体自组装成碳纳米管材料或碳黑。第二，将第一步获得的产物冷冻干燥。通过多种测试手段对Pt / WC x /纳米碳电催化剂的组成和结构进行了表征，例如X射线衍射，场发射扫描电子显微镜，透射电子显微镜和X射线光电子能谱。结果表明，当Pt和WC的比例在适当范围内时，合金化。 MOR的电化学性能通过循环伏安法和计时电流法在酸性介质中进行评估。结果表明，Pt / WC 0.15 / C电催化剂对MOR表现出最高的电催化活性和最佳的稳定性。电化学性能的增强归因于元素Pt d谱带中心的负移，这会削弱对CO分子的吸附强度，促进CO基团的去除并提高MOR活性。新开发的一锅法在合成Pt和碳化物纳米复合电催化剂方面具有很大的潜力，并在燃料电池的应用中显示出广阔的前景。

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