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Elucidating the rol...
Elucidating the role of Ni to enhance the methanol oxidation reaction on Pd electrocatalysts
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- B. Araujo, Rafael (author)
- Stockholms universitet,Fysikum
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- Martín-Yerga, Daniel (author)
- KTH,Tillämpad elektrokemi,Univ Warwick, Dept Chem, Coventry CV4 7AL, W Midlands, England.
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- Campos dos Santos, Egon (author)
- Stockholms universitet,Fysikum
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- Cornell, Ann M., 1962- (author)
- KTH,Tillämpad elektrokemi
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- Pettersson, Lars G. M. (author)
- Stockholms universitet,Fysikum
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(creator_code:org_t)
- Elsevier BV, 2020
- 2020
- English.
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In: Electrochimica Acta. - : Elsevier BV. - 0013-4686 .- 1873-3859. ; 360
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Subject headings
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- Amongst promising available technologies enabling the transition to renewable energy sources, electrochemical oxidation of alcohols, in a direct fuel cell or in an electrolysis reaction (H-2 production), can be an economically and sustainable alternative to currently used technologies. In this work, we highlight the advantages of a Pd-Ni bimetallic electrocatalyst for methanol electrooxidation - a convenient choice due to the low cost of Ni combined with the observed acceptable catalytic performance of Pd. We report a synergistic effort between experiments and theoretical calculations based on density functional theory to provide an in-depth understanding - at the atomistic level - of the origin of the enhanced electrochemical activity of methanol electrooxidation using the bimetallic catalysts Pd3Ni and PdNi over pure Pd. Cyclic voltammograms and High-Performance Liquid Chromatography (HPLC) demonstrate higher activity towards methanol electrooxidation with increased Ni concentration and, furthermore, higher selectivity for CO2. These effects are understood by: 1) changes in the methanol oxidation reaction mechanism. 2) Mitigation or suppression of CO poisoning on the Pd-Ni alloys as compared to the pure Pd catalyst. 3) A stronger tendency towards highly oxidized intermediates for the alloys. These findings elucidate the effects of a bimetallic electrocatalyst for alcohol electrooxidation as well as unambiguously suggest PdNi as a more cost-effective alternative electrocatalyst.
Subject headings
- NATURVETENSKAP -- Kemi -- Fysikalisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Physical Chemistry (hsv//eng)
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
Keyword
- Electrocatalysis
- Methanol oxidation
- Density functional theory
- Pd catalyst
- Energy conversion
Publication and Content Type
- ref (subject category)
- art (subject category)
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