High CO tolerance of Pt nanoparticles synthesized by sodium borohydride in a time-domain NMR spectrometer. (3rd September 2020)

• Record Type: Journal Article
• Authors: Ramos, A.S.; Santos, M.C.L.; Godoi, C.M.; de Queiroz, L.C.; Nandenha, J.; Fontes, E.H.; Brito, W.R.; Machado, M.B.; Neto, A.O.; de Souza, R.F.B.
• Is Part Of: International journal of hydrogen energy. Volume 45:Number 43(2020)
• Page Start: 22973
• Page End: 22978
• Publication Date: 2020-09-03
• Subjects: Pt/C -- CO stripping -- Fuel cell -- Time domain NMR -- Nuclear magnetic resonance; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2020.06.105
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: The CO poisoning effect was overcome using a novel synthesis method. This method consists of using sodium borohydride reducing agent assisted by magnetic field and radiofrequency pulses in the time-domain NMR spectrometer. This synthesis was useful to disperse the Pt nanoparticles over the carbon support and to compress the lattice strain of the Pt crystalline structure. Besides that, Pt/C MFP90° showed a multi-CO oxidation component in cyclic voltammetry, and this can avoid the poisoning effect by creating a large availability of CO species to be adsorbed, desorbed, and re-adsorbed. Pt/C MFP90° has also shown the best performance in the PEMFC regarding H2 and CO + H2 experiments. Graphical abstract: Image 1 Highlights: Nanoparticle synthesis by sodium borohydride within a TD-NMR spectrometer. High CO tolerance of Pt/C due to lattice parameter contraction. Pt/C MFP90° has the better performance over H2 and H2 + CO experiments.