Highly Efficient Oxygen Electrode Obtained by Sequential Deposition of Transition Metal-Platinum Alloys on Graphene Nanoplatelets

A set of platinum (Pt) and earth-abundant transition metals (M = Ni, Fe, Cu) on graphene nanoplatelets (sqPtM/GNPs) was synthesised via sequential deposition to establish parallels between the synthesis method and the materials' electrochemical properties. sqPtM/GNPs were assessed as bifunction...

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Published inMaterials Vol. 16; no. 9; p. 3388
Main Authors Mladenović, Dušan, Daş, Elif, Santos, Diogo M F, Bayrakçeken Yurtcan, Ayşe, Šljukić, Biljana
Format Journal Article
LanguageEnglish
Published Switzerland MDPI AG 26.04.2023
MDPI
Subjects
Adsorption
alloy nanoparticles
Alloys
Batteries
bifunctional electrocatalyst
Carbon dioxide
Catalysis
Charge transfer
Chemical synthesis
Copper
Deposition
Electrocatalysts
Electrochemical analysis
Electrodes
Electrolytes
Force and energy
Fuel cell industry
Fuel cells
Graphene
graphene nanoplatelets
Graphite
Hydrogen as fuel
Iron
Metal air batteries
Morphology
Nanoparticles
oxygen evolution reaction
Oxygen evolution reactions
oxygen reduction reaction
Platelets (materials)
Platinum
Platinum alloys
Platinum base alloys
Regenerative fuel cells
Transition metal alloys
Transition metal compounds
Transition metals
alloy nanoparticles
oxygen evolution reaction
graphene nanoplatelets
oxygen reduction reaction
bifunctional electrocatalyst
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Summary:A set of platinum (Pt) and earth-abundant transition metals (M = Ni, Fe, Cu) on graphene nanoplatelets (sqPtM/GNPs) was synthesised via sequential deposition to establish parallels between the synthesis method and the materials' electrochemical properties. sqPtM/GNPs were assessed as bifunctional electrocatalysts for oxygen evolution (OER) and reduction (ORR) reactions for application in unitised regenerative fuel cells and metal-air batteries. sqPtFe/GNPs showed the highest catalytic performance with a low potential difference of ORR half-wave potential and overpotential at 10 mA cm during OER, a crucial parameter for bifunctional electrocatalysts benchmarking. A novel two-stage synthesis strategy led to higher electrocatalytic performance by facilitating the reactants' access to the active sites and reducing the charge-transfer resistance.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
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ISSN:1996-1944
1996-1944
DOI:10.3390/ma16093388