Journal
ADVANCED MATERIALS
Volume 29, Issue 46, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201703460
Keywords
in situ TEM; oriented attachment; oxygen reduction reaction; platinum-based nanowires; solid-state reaction
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Funding
- thousand talents program for distinguished young scholars from Chinese government
- National Science Foundation of China [51521004, 51420105009]
- Zhi-Yuan Endowed fund from Shanghai Jiao Tong University
- National Science Foundation [CBET-1159240]
- School of Engineering at University of California, Irvine
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Facile fabrication of advanced catalysts toward oxygen reduction reaction with improving activity and stability is significant for proton-exchange membrane fuel cells. Based on a generic solid-state reaction, this study reports a modified hydrogen-assisted, gas-phase synthesis for facile, scalable production of surfactant-free, thin, platinum-based nanowire-network electrocatalysts. The free-standing platinum and platinum-nickel alloy nanowires show improvements of up to 5.1 times and 10.9 times for mass activity with a minimum 2.6% loss after an accelerated durability test for 10k cycles; 8.5 times and 13.8 times for specific activity, respectively, compared to commercial Pt/C catalyst. In addition, combined with a wet impregnation method, different substrate-materials-supported platinum-based nanowires are obtained, which paves the way to practical application as a next-generation supported catalyst to replace Pt/C. The growth stages and formation mechanism are investigated by an in situ transmission electron microscopy study. It reveals that the free-standing platinum nanowires form in the solid state via metal-surface-diffusion-assisted oriented attachment of individual nanoparticles, and the interaction with gas molecules plays a critical role, which may represent a gas-molecular-adsorbate-modified growth in catalyst preparation.
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