期刊
JOURNAL OF POWER SOURCES
卷 297, 期 -, 页码 59-67出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2015.07.099
关键词
Palladium@Platinum bimetallic; Methanol oxidation reaction; Core/shell; Capping agent; Active surface site
资金
- National Natural Science Foundation of China [NSFC 21201097, NSFC 21467019, NSFC 21261011]
- Program for New Century Excellent Talents in University [NCET-10-0907]
- Natural Science Foundation of Inner Mongolia Autonomous Region of China [2014MS0506]
A series of well-dispersed bimetallic Pd@Pt nanodendrites uniformly supported on XC-72 carbon black are fabricated by using different capping agents. These capping agents are essential for the branched morphology control. However, the surfactant adsorbed on the nanodendrites surface blocks the access of reactant molecules to the active surface sites, and the catalytic activities of these bimetallic nanodendrites are significantly restricted. Herein, a facile reflux procedure to effectively remove the capping agent molecules without significantly affecting their sizes is reported for activating supported nanocatalysts. More significantly, the structure and morphology of the nanodendrites can also be retained, enhancing the numbers of active surface sites, catalytic activity and stability toward methanol and ethanol electro-oxidation reactions. The as-obtained hot water reflux-treated Pd@Pt/C catalyst manifests superior catalytic activity and stability both in terms of surface and mass specific activities, as compared to the untreated catalysts and the commercial Pt/C and Pd/C catalysts. We anticipate that this effective and facile removal method has more general applicability to highly active nanocatalysts prepared with various surfactants, and should lead to improvements in environmental protection and energy production. (C) 2015 Elsevier B.V. All rights reserved.
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