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Monodispersed platinum nanoparticle supported carbon electrodes for hydrogen oxidation and oxygen reduction in proton exchange membrane fuel cells
Ch Venkateswara Rao, Balasubramanian Viswanathan
Published in
2010
Volume: 114
   
Issue: 18
Pages: 8661 - 8667
Abstract
A series of Pt/C electrocatalysts with average Pt particle size of 1.8, 2.3, 3.4, 3.8, 4.7, and 5.8 nm are synthesized by reducing platinum(II) acetylacetonate with 1,2-hexadecanediol in the presence of long-chain carboxylic acid and alkylamine stabilizing agents. The prepared materials are characterized by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), and energy dispersive X-ray (EDX) spectrometry. The face-centered cubic structure of Pt in the materials is evident from XRD. Good spatial distribution of spherical shaped Pt nanoparticles is seen from the HRTEM images. The presence of Pt and C is observed from the EDX analysis. Linear sweep voltammetry (LSV), rotating disk electrode (RDE), and single-cell proton exchange membrane fuel cell (PEMFC) measurements are conducted to evaluate the electrocatalytic activity of Pt/C electrocatalysts. Electrochemical measurements indicate the good hydrogen oxidation and oxygen reduction activity for 1.8 and 3.4 nm size Pt particles, respectively. Kinetic analysis by RDE voltammetry reveals that the number of electrons transferred in hydrogen oxidation (HOR) and oxygen reduction (ORR) processes on 1.8 and 3.4 nm size Pt nanoparticles is 2 and 4, respectively. The high performance Pt/C anode and cathode are then used to fabricate a membrane-electrode assembly (MEA) and tested in a PEMFC. A maximum power density of 625, 760, and 1030 mW/cm2 is observed at 333, 343, and 353 K, respectively. © 2010 American Chemical Society.
About the journal
JournalJournal of Physical Chemistry C
ISSN19327447
Open AccessNo
Concepts (45)
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    ALKYLAMINE
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    CARBON ELECTRODE
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    Edx analysis
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    Electrocatalytic activity
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    ELECTROCHEMICAL MEASUREMENTS
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    Energy dispersive x-ray
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    FACE-CENTERED CUBIC STRUCTURE
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    Hrtem images
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    Hydrogen oxidation
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    Kinetic analysis
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    Linear sweep voltammetry
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    MAXIMUM POWER DENSITY
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    MEMBRANE ELECTRODE ASSEMBLIES
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    Mono-dispersed
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    NUMBER OF ELECTRONS
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    Oxygen reduction
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    Platinum acetylacetonate
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    Platinum nanoparticles
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    PT NANOPARTICLES
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    PT PARTICLE
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    Rotating disk electrodes
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    Spatial distribution
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    Stabilizing agents
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    XRD
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    Carboxylic acids
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    Electrocatalysts
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    Electrodes
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    Electrolytic reduction
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    High resolution transmission electron microscopy
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    Hydrogen
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    Membranes
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    Nanoparticles
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    Organic acids
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    Oxidation
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    Oxygen
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    Platinum alloys
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    Proton exchange membrane fuel cells (pemfc)
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    Protons
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    Rotating disks
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    Scanning electron microscopy
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    Size distribution
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    Synthesis (chemical)
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    Voltammetry
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    X ray diffraction
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    Platinum