Graphene-like materials as an alternative to carbon Vulcan support for the electrochemical reforming of ethanol: Towards a complete optimization of the anodic catalyst

[Display omitted] •GNPs is a competitive anodic catalyst support alternative to Carbon Vulcan.•Pt-Ni catalyst achieved better electro-oxidation activity comparable to Pt-Ru.•An overall optimization of the anodic catalyst and loading have been performed.•Pt/Ni 2:1 (40 wt% metal loading) presented the...

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Published in:Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2022-09, Vol.921, p.116680, Article 116680
Main Authors: Serrano-Jiménez, J., de la Osa, A.R., Rodríguez-Gómez, A., Sánchez, P., Romero, A., de Lucas-Consuegra, A.
Format: Article
Language:English
Subjects:
Bimetals
Carbon
Catalysts
Electrical resistivity
Electrochemical reforming
Electrolysis
Ethanol
Ethanol electro oxidation
Ethanol electrolysis
Graphene
Graphene-like supports
Hydrogen production
Membranes
Metal particles
Nitrogen
Optimization
Oxidation
Pt-Ni anode
Reforming
Surface area
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Summary:[Display omitted] •GNPs is a competitive anodic catalyst support alternative to Carbon Vulcan.•Pt-Ni catalyst achieved better electro-oxidation activity comparable to Pt-Ru.•An overall optimization of the anodic catalyst and loading have been performed.•Pt/Ni 2:1 (40 wt% metal loading) presented the highest activity and durability.•Acetaldehyde was the most selective organic product from ethanol electrooxidation. This study aims to investigate the viability of using commercial graphene-like materials as Pt based anodic catalyst supports as an alternative to the extended use of carbon Vulcan XC-72, for the ethanol oxidation reaction (EOR). Among the different investigated catalysts, Pt supported on graphene nanoplatelets (GNPs) resulted to be the most active, which was attributed to a combination of a higher BET surface area and a slightly higher amount of nitrogen in comparison with other supports. A higher BET surface area of the support could mean a larger pore volume available to settle the metal particles, whereas a greater amount of nitrogen may improve its electrical conductivity. A complete optimization of the Pt metal loading and Pt-Ni ratio on the final anodic bimetallic catalyst was also performed to prepare a membrane electrode assembly (MEA) for a proton exchange membrane ethanol electrolysis cell (PEMEC). Finally, the metal loading on MEA was optimized towards the production of hydrogen and value-added products resulting from the EOR. The MEA based on the optimized anodic Pt-Ni/GNPs catalyst allow to obtain current density values around 590 mA·cm−2 (at 1.4 V), higher than previous studies based on Pt-Ru and Pt-Sn catalysts supported on Carbon Vulcan.
ISSN:1572-6657
1873-2569
DOI:10.1016/j.jelechem.2022.116680