TY - JOUR
T1 - A sunflower-like graphene oxide decorated with Pd/Pt for ethylene glycol/methanol electrooxidation
AU - Krishnaveni, Murugesan
AU - Sorrentino, Andrea
AU - Wu, Jerry J.
AU - Mangalaraja, Ramalinga Viswanathan
AU - Anandan, Sambandam
AU - Ashokkumar, Muthupandian
N1 - Publisher Copyright:
© 2025 Hydrogen Energy Publications LLC
PY - 2026/1/28
Y1 - 2026/1/28
N2 - A sunflower-like reduced graphene oxide-supported Pd/Pt nanocomposite (rGO/Pd/Pt) was successfully synthesized via a one-pot ascorbic acid-assisted co-reduction approach and evaluated as a highly active electrocatalyst for mixed-alcohol oxidation in alkaline medium. The bimetallic Pd–Pt nanoparticles, anchored uniformly on the conductive rGO network, exhibited a well-defined dendritic “sunflower” morphology that maximized the exposure of electroactive sites and enhanced charge transfer. Comprehensive structural analyses confirmed the formation of crystalline Pd–Pt alloyed nanostructures and their homogeneous dispersion over rGO sheets. Electrochemical measurements demonstrated that the rGO/Pd/Pt catalyst achieved superior catalytic activity and stability towards electrooxidation of ethylene glycol (EG), methanol (MeOH), and their mixtures compared to monometallic rGO/Pd. Notably, the optimised mixed-fuel composition (0.7 M EG + 0.3 M MeOH) yielded the highest current density of 93.07 mA mg−1 [Pd/Pt] and the largest electrochemically active surface area (ECSA) of 124.9 m2 g−1, outperforming most reported Pd–Pt/graphene-based catalysts. These results highlight the synergistic effect of the Pd–Pt bimetallic system and the sunflower-like nanostructure, establishing rGO/Pd/Pt as a promising anode catalyst for efficient direct alcohol fuel cells (DAFCs).
AB - A sunflower-like reduced graphene oxide-supported Pd/Pt nanocomposite (rGO/Pd/Pt) was successfully synthesized via a one-pot ascorbic acid-assisted co-reduction approach and evaluated as a highly active electrocatalyst for mixed-alcohol oxidation in alkaline medium. The bimetallic Pd–Pt nanoparticles, anchored uniformly on the conductive rGO network, exhibited a well-defined dendritic “sunflower” morphology that maximized the exposure of electroactive sites and enhanced charge transfer. Comprehensive structural analyses confirmed the formation of crystalline Pd–Pt alloyed nanostructures and their homogeneous dispersion over rGO sheets. Electrochemical measurements demonstrated that the rGO/Pd/Pt catalyst achieved superior catalytic activity and stability towards electrooxidation of ethylene glycol (EG), methanol (MeOH), and their mixtures compared to monometallic rGO/Pd. Notably, the optimised mixed-fuel composition (0.7 M EG + 0.3 M MeOH) yielded the highest current density of 93.07 mA mg−1 [Pd/Pt] and the largest electrochemically active surface area (ECSA) of 124.9 m2 g−1, outperforming most reported Pd–Pt/graphene-based catalysts. These results highlight the synergistic effect of the Pd–Pt bimetallic system and the sunflower-like nanostructure, establishing rGO/Pd/Pt as a promising anode catalyst for efficient direct alcohol fuel cells (DAFCs).
KW - Alkaline medium
KW - DAFCs
KW - Ethylene glycol
KW - rGO/Pd/Pt
UR - https://www.scopus.com/pages/publications/105027002618
U2 - 10.1016/j.ijhydene.2025.153325
DO - 10.1016/j.ijhydene.2025.153325
M3 - Article
AN - SCOPUS:105027002618
SN - 0360-3199
VL - 204
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
M1 - 153325
ER -
