Journal
ELECTROCHIMICA ACTA
Volume 230, Issue -, Pages 245-254Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2017.01.159
Keywords
electrocatalysts; hybrid microfluidic-batch process; nanocrystal; methanol oxidization reaction
Categories
Funding
- National Science Foundation of China (NSFC) [51371018, 50971010]
- Fundamental Research Funds for Central Universities of China [FRF-BR-15-027A, FRF-BR-14-001B]
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Carbon supported FePt and FePtSn alloy nanocrystals were synthesized via a hybrid microfluidic-batch process. Their microstructures and compositions were characterized by transmission electron microscopy, high resolution transmission electron microscope, energy dispersive X-ray spectrometer, X-ray powder diffraction and X-ray photoelectric spectroscopy. All the nanocatalysts show a homogeneous distribution of ultra-small alloy nanoparticles (similar to 2-3 nm) on the surface of carbon black. The electrochemical results indicate that FePtSn/C nanocatalysts have more excellent catalytic activity for methanol oxidation compared with Pt/C catalyst. Chronoamperometry measurements were performed at 0.45 V for 3600 s. At 3600 s, the mass specific activity of FePtSn/C (Sn at% = 14) can retain 103 mAmgpt(-1), about 10 times higher than that of Pt/C catalyst (10 mAmgpt-1). The CO-stripping tests indicate that FePtSn/C (Sn at%= 14) nanocatalysts preserve a high electrochemical active specific surface and a higher ability to resist poisons, thus making the FePtSniC (Sn at%=14) catalyst an excellent electrocatalyst for direct methanol fuel cells. (C) 2017 Elsevier Ltd. All rights reserved.
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