期刊
ACS CATALYSIS
卷 6, 期 8, 页码 5260-5267出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.6b01440
关键词
branched structure; Pt nanostructures; chemical functionalization; oxygen reduction reaction; alcohol tolerance
资金
- National Natural Science Foundation of China [21473111, 21473107, 21376122]
- Natural Science Foundation of Shaanxi Province [2015JM2043]
- Fundamental Research Funds for the Central Universities [GK201602002]
- Innovation Funds of Graduate Programs at Shaanxi Normal University [2015CXS048]
The catalytic performance of noble metal nanocrystals highly depends on their surface structure and interface structure. Effective surface/interface control over noble metal nanocrystals can significantly improve their electrocatalytic activity, durability, and selectivity for the various important electrochemical reactions in low-temperature polymer electrolyte fuel cells. In this work, the polyallylamine (PAA)-functionalized Pt nanostructures with long-spined sea-urchin-like morphology (Pt-LSSUs@PAA) have been synthesized successfully through a simple chemical reduction route. The high branching degree of Pt-LSSUs@PAA nanostructures and the sheet morphology of the branches effectively improve the utilization of the Pt metal. The particular 3D interconnected architecture of Pt-LSSUs@PAA nanostructures significantly enhances the electrochemical stability. Loose packed PAA layers on the surface of Pt-LSSUs@PAA nanostructures efficiently modify the electronic property of Pt atoms and serve as barrier networks to restrain the accessibility of alcohol molecules. As a result, the as-prepared Pt-LSSUs@PAA nanostructures show high activity, excellent durability, and particular alcohol tolerance for the oxygen reduction reaction in acidic media.
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