(1. 陜西能源職業(yè)技術學院 資源與測繪工程學院，咸陽 712000；
2. 浙江工業(yè)大學 化學工程學院，杭州 310032；
3. 浙江工業(yè)大學 綠色化學合成技術國家重點實驗室培訓基地，杭州 310032)
摘 要: 以剝離后的蒙脫石(Mnt)片層為載體、六氯化鎢(WCl6)為鎢源，通過浸漬負載及原位還原碳化獲得了碳化鎢(WC)與蒙脫石(Mnt)納米復合材料，然后將氯鉑酸(H2PtCl6)通過浸漬負載于復合材料上，并在氫氣(H2)中還原得到Pt-WC/Mnt三元納米復合催化材料。采用X射線粉末衍射和透射電子顯微鏡對三元納米復合催化材料的物相、形貌和結構進行表征，采用三電極體系和循環(huán)伏安法測試了樣品的電催化性能。結果表明：樣品物相主要為WO3和WC，蒙脫石片層結構明顯，鉑(Pt)納米粒子均勻分布于WC/Mnt復合材料的外表面。Pt-WC/Mnt三元納米復合材料對甲醇電催化氧化具有較高的催化活性，并且在酸堿體系中均具有良好的穩(wěn)定性。
關鍵字: 鉑；碳化鎢；蒙脫石；三元納米復合材料；電催化性能
（1. School of Resource and Geomatics, Shaanxi Energy Institute, Xianyang 712000, China;
2. School of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China.
3. State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology, Zhejiang University of Technology, Hangzhou 310032, China）
Abstract:A tungsten carbide (WC) montmorillonite (Mnt) nanocomposite (WC/Mnt) was fabricated by combining a chemical immersion approach with a reduction-carbonization method in-situ using tungsten hexachloride as tungsten source and exfoliated Mnt as support. The nanocomposite supported Pt nanoparticles (Pt-WC/Mnt) with uniform size was prepared using H2 as reductant and H2PtCl6 as Pt precursor. The crystal phase, structure and morphology of the ternary nanocomposite catalysts were characterized by X-ray diffractometry and transmission electronic microscopy. The electrocatalytic activity of Pt-WC/Mnt as-prepared was investigated using three-electrode system and cyclic voltammetry. The results show that the crystal phase of the catalyst composed of WC and WO3. After reduced by H2, the layer structure of Mnt in the composite is obvious, Pt particles of about 4 nm in diameter disperse on the outer surface of the WC/Mnt composite uniformly. The Pt-WC/Mnt catalysts exhibit high electrocatalytic activity for methanol electrocatalytic oxidation and good stability in acidic and alkaline electrolyte. These can be attributed to the typical structure of the composite and the synergistic effect among all the components of the ternary nanocomposite, which outlines a foundation for the practical application of Pt-WC/Mnt ternary nanocomposites.
Key words: platinum; tungsten carbide; montmorillonite; ternary nanocomposite; electrocatalytic property
