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Efficient tuning of the Pt nano-particle mono-dispersion on Vulcan XC-72R by selective pre-treatment and electrochemical evaluation of hydrogen oxidation and oxygen reduction reactions

Lookup NU author(s): Nur Hidayati, Professor Keith Scott

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Abstract

The effect of chemical pre-treatment of the carbon support used for deposition of Pt nanoparticles is reported. Data on particle size, distribution and their electocatalytic activity toward hydrogen oxidation reaction (HOR) and oxygen reduction reaction (ORR) are reported. Vulcan XC-72R carbon was pre-treated with 5% HNO3, 0.07 M H3PO4, 0.2 M KOH and 10% H2O2. The properties of carbon supports were studied by N-2 adsorption and X-ray photoelectron spectroscopy (XPS). Chemical reduction with ethylene glycol (EG) was used to synthesize Pt on carbon supports and the differences in catalyst morphology were characterized using CO chemisorption, X-ray diffraction, energy dispersive X-ray analysis and transmission electron microscope techniques. The electrocatalytic activity of Pt/C catalysts toward HOR and ORR was examined by cyclic voltammetry (CV) on a rotating ring-disk electrode (RRDE) and compared with E-Tek Pt/C. The ORR was predominantly involved via four-electron process with the first electron transfer being the rate-determining step. However, the specific activity and mass activity were greatly influenced by the pre-treatment employed. Copyright (C) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.


Publication metadata

Author(s): Kumar SMS, Hidyatai N, Herrero JS, Irusta S, Scott K

Publication type: Article

Publication status: Published

Journal: International Journal of Hydrogen Energy

Year: 2011

Volume: 36

Issue: 9

Pages: 5453-5465

Print publication date: 05/03/2011

ISSN (print): 0360-3199

ISSN (electronic): 1879-3487

Publisher: Pergamon

URL: http://dx.doi.org/10.1016/j.ijhydene.2011.01.124

DOI: 10.1016/j.ijhydene.2011.01.124


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