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Electrodeposited Pt–Pd dendrite on carbon support as anode for direct formic acid fuel cells
Volga Muthukumar,
Published in Institute for Ionics
2018
Volume: 24
   
Issue: 12
Pages: 3937 - 3947
Abstract
The activity of bimetallic catalyst is predominantly determined by its composition and its shape. In this work, Pt–Pd bimetallic catalysts were codeposited using cyclic voltammetry on a carbon black-coated carbon paper at two different potential ranges (0 to 1.3 V and − 0.2 to 1.3 V vs. SHE) and with two different Pt precursors (H2PtCl6 and K2PtCl4). SEM analysis revealed that the deposit obtained from both K2PtCl4 and H2PtCl6 precursor resembled the shape of a flower-like dendrite when the deposition potential window was in the range of 0 to 1.3 V. However, shifting the lower potential limit from 0 to − 0.2 V resulted in a leaf-like dendritic structure, irrespective of the Pt precursor used. Leaf-like dendritic structures showed enhanced formic acid oxidation activity with high mass activity and superior stability compared to flower-like structures. The superior performance of the leaf-like structure was clearly evident from fuel cell polarization studies carried out at 70 °C, which showed a maximum power density of 49 mW cm−2, whereas flower-like structures showed a power density of 20 mW cm−2. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature.
About the journal
JournalIonics
PublisherInstitute for Ionics
ISSN09477047
Open AccessNo
Concepts (17)
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    Carbon black
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    Catalyst activity
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    Chlorine compounds
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    Cyclic voltammetry
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    Deposition
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    Electrodes
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    Formic acid
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    Platinum
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    Bimetallic alloys
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    CODEPOSITION
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    CYCLIC VOLTAMMETRIC
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    DIRECT FORMIC ACID FUEL CELLS
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    FLOWER-LIKE STRUCTURES
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    Formic acid oxidation
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    FUEL CELL POLARIZATION
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    MAXIMUM POWER DENSITY
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    FORMIC ACID FUEL CELLS (FAFC)