Preparation of ordered mesoporous carbons containing well-dispersed and highly alloying Pt-Co bimetallic nanoparticles toward methanol-resistant oxygen reduction reaction
Preparation of ordered mesoporous carbons containing well-dispersed and highly alloying Pt-Co bimetallic nanoparticles toward methanol-resistant oxygen reduction reaction
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DOI：
10.1016/j.apcatb.2011.08.011
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发表时间：
2011-10-11
影响因子：
22.1
通讯作者：
Wu, Jyun-Ren
中科院分区：
文献类型：
--
作者：
Liu, Shou-Heng;Zheng, Feng-Sheng;Wu, Jyun-Ren
介绍了一种以介孔二氧化硅为硬模板剂，通过同时热解碳和金属前驱体制备有序介孔碳(Pt100-xCOX/OMC)负载的分散良好、合金化程度高的PtCo双功能纳米粒子的简便方法。使用各种不同的光谱和分析技术对Pt100-xCOX/OMC样品进行了彻底的表征。X-射线衍射仪、N-2吸附/脱附等温线和透射电子显微镜表明，Pt100-xCOX/OMC具有分散良好的纳米铂/钴颗粒(2-3 nm)，负载在高比表面积(类似于1000m(2)g(-1))和规则的孔道(类似于2.8 nm)上。在Pt100-xCOX/OMC催化剂中，与典型的商用电催化剂相比，Pt50Co50/OMC催化剂具有更好的电催化活性和对氧还原反应中甲醇渗透的耐受性。这可能是由于Pt50Co50/OMC负载的高合金化PtCo纳米粒子的分散性和独特的纳米结构所致。(C)2011爱思唯尔B.V.保留所有权利。
A simple route is described for the synthesis of well-dispersed and highly alloying PtCo bifunctional nanoparticles supported on ordered mesoporous carbons (Pt100-xCox/OMC) by the simultaneous pyrolysis of carbon and metal precursors in a mesoporous silica as the hard template. A variety of different spectroscopic and analytical techniques was used to thoroughly characterize the Pt100-xCox/OMC samples. By X-ray diffraction, N-2 adsorption/desorption isotherms and transmission electron microscopy, it was found that Pt100-xCox/OMC possessed well-dispersed Pt/PtCo nanoparticles (2-3 nm) supported on high surface area (similar to 1000 m(2) g(-1)) and regular pore channels (similar to 2.8 nm). Among Pt100-xCox/OMC catalysts, the Pt50Co50/OMC was found to have superior electrocatalytic activity and the tolerance to methanol crossover during oxygen reduction reaction as compared to typical commercial electrocatalysts. This may be attributed to the dispersion and unique nanostructure of highly alloyed PtCo nanoparticles supported on Pt50Co50/OMC evidenced by X-ray absorption spectroscopy. (C) 2011 Elsevier B.V. All rights reserved.