Highly Efficient Oxygen Electrode Obtained by Sequential Deposition of Transition Metal-Platinum Alloys on Graphene Nanoplatelets.
Dušan MladenovićElif DaşDiogo M F SantosAyşe Bayrakçeken YurtcanBiljana ŠljukićPublished in: Materials (Basel, Switzerland) (2023)
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 -2 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.
Keyphrases
- highly efficient
- metal organic framework
- transition metal
- human health
- carbon nanotubes
- induced apoptosis
- stem cells
- mesenchymal stem cells
- risk assessment
- room temperature
- gold nanoparticles
- molecularly imprinted
- signaling pathway
- walled carbon nanotubes
- high resolution
- cell proliferation
- heavy metals
- oxidative stress