片层WC/C的原位合成及其在甲醇氧化中的应用
In Situ Synthesis and Application in Methanol Oxidation of Lamellar WC/C
作者单位E-mail
李影影 浙江工业大学化学工程学院, 杭州 310014  
黄丽珍 浙江工业大学化学工程学院, 杭州 310014  
蔡晓微 浙江工业大学化学工程学院, 杭州 310014  
陈赵扬 浙江工业大学化学工程学院, 杭州 310014  
刘委明 台州非常金属燃料电池研究中心, 台州 318000  
施梅勤 浙江工业大学化学工程学院, 杭州 310014 smq@zjut.edu.cn 
摘要: 以片层二硫化钨(WS2)为前驱体,氯化钠(NaCl)为介质,CO为气体碳源,采用程序升温法一步合成片层碳化钨/碳复合材料(WC/C)。通过X射线衍射(XRD),X射线近边吸收谱(XANES)和扫描电镜(SEM)等一系列手段对样品的化学组成、形貌、结构等进行表征。研究发现,在高温渗碳过程中,不仅利用WS2的片层结构和NaCl的锚定作用合成了具有薄层孔洞的WC,而且NaCl和WS2金属面对碳膜生长的催化作用使WC表面覆有原位生长的碳膜,为电子传输提供了有效通道。将该材料作为载体材料进行电化学性能测试,结果表明:负载少量Pt后制得的Pt/WC/C电催化剂,在甲醇氧化反应(MOR)中表现出良好的电催化活性、稳定性及优异的抗CO中毒能力。
关键词: 二硫化钨  氯化钠  碳化钨/碳  电催化  甲醇氧化
基金项目: 浙江省自然科学基金(No.LY16B060009,LQ15B030004)资助项目。
Abstract: The layered tungsten carbide/carbon composite (WC/C) was synthesized by a programmed temperature method using tungsten sulfide (WS2) as a precursor, sodium chloride (NaCl) as a medium and CO as a gas carbon source. The chemical composition, morphology and structure of the samples were characterized by XRD, XANES and SEM respectively. A thin layered WC with holes has been synthesized because of the natural lamellar structure of WS2 and the anchoring effect of molten NaCl during high-temperature carburization. In addition, NaCl and the metal surface of WS2 could be used as the catalyst for in situ growing of carbon film on the surface of WC effectively, which provides a useful channel for electronic transmission. The electrocatalytic performance of the Pt/WC/C electrocatalyst was investigated after loading a small amount of Pt on WC/C. The results show that the Pt/WC/C electrocatalyst exhibits a better electrocatalytic activity and stability, also a higher resistance toward CO poisoning in methanol oxidation (MOR).
Keywords: tungsten sulfide  sodium chloride  tungsten carbide/carbon  electrocatalysis  methanol oxidation
投稿时间:2018-02-08 修订日期:2018-05-02
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李影影,黄丽珍,蔡晓微,陈赵扬,刘委明,施梅勤.片层WC/C的原位合成及其在甲醇氧化中的应用[J].无机化学学报,2018,34(8):1437-1447.
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