摘要
采用硬模板法制备了介孔碳化钨（m—wc），进～步还原铂的前驱体（H2PtCl6）得到Pt／m—WC催化剂。采用x射线粉末衍射（XRD）、透射电子显微镜（TEM））glX射线光电子能谱（XeS）等测试手段对样品的物相、结构和形貌进行了表征。结果表明，所制得的m—WC载体为单一的碳化钨相，孔径为10～20nm，Pt／m—WC催化剂中Pt的粒径约为3．4nm，主要以金属态形式存在，相对比较均一的Pt纳米粒子均匀地分散在载体的表面和孔道中。电化学测试结果表明，与普通WC载Pt催化计（Vt／c．wc）相比，Pt／m．WC催化剂具有较大的电化学活性表面积，对甲醇呈现出更高的电催化氧化活性和更好的稳定性。
Mesoporous tungsten carbide supported Pt nanoparticles （Pt/m-WC） with uniform size were prepared using hard template method and H2PtC16 as the Pt precursor. The crystal phase, structure and morphology of products were characterized with X-ray powder diffraction （XRD）, transmission electronic microscope （TEM）, and X-ray photoelec- tron spectrocope （XPS）. Results show that the tungsten carbide supporter has pure tungsten carbide phase with pore size of about 10-20 nm. Pt particles （3.4 nm mean size） which are mainly in the metallic form are dispersed on the ex- ternal walls and pores of m-WC. The electro-catalytic activity of the prepared Pt/m-WC towards the oxidation of methanol was investigated using cyclic voltammetry and chronoamperometry. In comparison to the common tungsten carbide supported Pt catalyst （Pt/c-WC）, the Pt/m-WC catalysts exhibits high electrocatalytic activity, strong anti-poisoning ability and good stability.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2013年第12期1286-1290,共5页
Journal of Inorganic Materials
基金
国家自然科学基金(21173193)
浙江省教育厅科研项目(Y201225711)
浙江省科技计划项目(2013C37104)~~
关键词
直接甲醇燃料电池
碳化钨
介孔材料
电催化
direct methanol fuel cell
tungsten carbide
mesoporous materials
electro-catalysis
