Journal
SMALL
Volume 16, Issue 33, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202001135
Keywords
electrocatalysis; methanol oxidation reaction (MOR); nanowire arrays; Pt nanowires; synthesis
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Funding
- National Natural Science Foundation of China [21703104, 21673117, 91956109]
- Thousand Talents Plan Youth Program [51237008]
- Recruitment Program of Global Experts
- Jiangsu Provincial Foundation for Specially-Appointed Professor [54937001]
- Jiangsu Science and Technology Plan [BK20170980]
- Nanjing Tech University [39837102, 39837131]
- SICAM Fellowship from the Jiangsu National Synergetic Innovation Centre for Advanced Materials
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High-performance electrocatalysts are of critical importance for fuel cells. Morphological modulation of the catalyst materials is a rare but feasible strategy to improve their performance. In this work, Pt nanowire arrays are directly synthesized with a template-less wet chemical method. The effects of surface functionalization and the reduction kinetics are revealed to be vital to the nanowire growth. The growth mechanism of the Pt nanowires is studied. By adjusting the concentration of the organic ligands, Pt nanowire arrays with tunable surface roughness can be obtained on various substrate surfaces. Such arrays avoid the contact resistance of randomly packed particles and allow open diffusion channels for reactants and products alike, making them excellent electrocatalysts for the methanol oxidation reaction. In particular, Pt nanowire arrays with rough surface have a mass activity of 1.24 A mg(Pt)(-1)at 1.12 V (vs Ag/AgCl), 3.18-fold higher than that of the commercial Pt/C catalysts. It also shows more resistant against poisoning, as indicated by the higherI(f)/I(b)ratio (2.06), in comparison to the Pt/C catalysts (1.30).
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