中空树枝状三氧化钨载铂催化剂对甲醇的电催化氧化性能研究

周阳; 胡仙超; 刘喜慧; 屈慧男; 温和瑞; 余长林

中空树枝状三氧化钨载铂催化剂对甲醇的电催化氧化性能研究

1.
江西理工大学钨资源高效开发及应用技术教育部工程研究中心, 江西赣州 341000;
2.
江西理工大学冶金与化学工程学院, 江西赣州 341000;
3.
浙江工业大学分析测试中心, 浙江杭州 310032

基金项目: 国家自然科学基金(51404110, 21263005); 赣鄱英才555工程, 江西省博士后择优资助项目基金(2014zy15); 江西理工大学科研基金(NSFJ2014-G08)。

详细信息

通讯作者:
胡仙超(1981-), 助理研究员, Tel/Fax: 0571-88871095, E-mail: huxc@zjut.edu.cn。

中图分类号: O646
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- 文章访问数: 518
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- 被引次数: 0
出版历程
- 收稿日期: 2014-08-04
- 修回日期: 2014-10-22
- 刊出日期: 2015-02-28

Performance of platinum nanoparticles supported on hollow mesoporous tungsten trioxide microsphere as an electrocatalyst for methanol oxidation

1.
Engineering Research Center of High-Efficiency Development and Application Technology of Tungsten Resources, Jiangxi University of Science and Technology, Ganzhou 341000, China;
2.
Metallurgical and Chemical Engineering Institute, Jiangxi University of Science and Technology, Ganzhou 341000, China;
3.
Research Center of Analysis and Measurement, Zhejiang University of Technology, Hangzhou 310032, China

摘要

摘要: 采用水热法和牺牲模板法相结合制备具有中空树枝结构的三氧化钨载体(d-WO₃),在其表面进一步负载活性成分Pt,得到纳米Pt/d-WO₃复合催化剂。采用X射线粉末衍射(XRD)、透射电镜(TEM)和比表面积和孔结构分析(BET)等对催化剂的形貌和结构进行了表征。结果表明,三氧化钨具有长6 μm和宽2 μm的中空树枝状结构,孔径分布主要集中在20~120 nm,比表面积为24 m²/g,平均粒径为7.2 nm的Pt纳米粒子均匀分布在其表面。采用循环伏安和计时电流法研究了Pt/d-WO₃催化剂在酸性溶液中对甲醇的电催化氧化性能。结果表明,Pt/d-WO₃催化剂比Pt/C和Pt/WO₃催化剂对甲醇有更高的电催化氧化活性和稳定性。d-WO₃所具有的中空介孔结构和双功能作用机理有利于甲醇在铂表面的直接脱氢氧化过程。
- 直接甲醇燃料电池 /
- 甲醇氧化 /
- 三氧化钨 /
- 载铂催化剂 /
- 电催化
Abstract: Hollow dendritic mesoporous tungsten trioxide (d-WO₃) was synthesized by combining the hydrothermal method with the template-sacrificing method; with d-WO₃ as a support, Pt/d-WO₃ catalyst was prepared through an improved liquid phase reduction method. The Pt/d-WO₃ catalyst was characterized by XRD, BET and TEM and its electrocatalytic activity and stability towards methanol electro-oxidation were investigated by cyclic voltammetry and chronoamperometry. The results indicated that d-WO₃ exhibits hollow microsphere dendritic structure with a length of 6 μm and a width of 2 μm; Pt nanoparticles with a size of 7.2 nm were highly dispersed on the surface of d-WO₃. The nitrogen physisorption on d-WO₃ displays type IV isotherms, which are typical for the mesoporous materials. Moreover, d-WO₃ shows a BET surface area of 24 m²/g, with a large number of pores around 20~120 nm. The as-prepared Pt/d-WO₃ catalyst exhibits higher electrocatalytic activity and better stability in methanol electro-oxidation in comparison with the Pt/WO₃ and Pt/C catalysts. The enhanced catalytic performance of Pt/d-WO₃ is attributed to its unique hollow mesoporous structure and the double function, which greatly accelerates the dehydrogenation of methanol on Pt.
- direct methanol fuel cell /
- methanol electro-oxidation /
- tungsten trioxide /
- platinum supported catalyst /
- electro-catalysis

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