Synthesis and Electrochemical Activity of Carbon-Supported Trimetallic Ir95-xPd5Ptx Nanoparticles as Bifunctional Catalysts for Oxygen Evolution/Reduction Reactions

Regenerative fuel cells and metal-air batteries are plausible green energy devices for replacing conventional fossil fuel-based energy systems. These energy devices demand potential bifunctional electrocatalysts for proficient functions. Therefore, identifying an efficient bifunctional electrocataly...

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Bibliographic Details
Published in:Electrocatalysis 2022-05, Vol.13 (3), p.328-337
Main Authors: Geethalakshmi, M., Ganeshbabu, M., Kalpana, D., Stephen, A.
Format: Article
Language:English
Subjects:
Carbon
Catalysis
Chemical reduction
Chemistry
Chemistry and Materials Science
Clean energy
Electrocatalysts
Electrochemistry
Energy Systems
Fossil fuels
Metal air batteries
Nanoparticles
Original Research
Oxygen evolution reactions
Oxygen reduction reactions
Physical Chemistry
Regenerative fuel cells
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Summary:Regenerative fuel cells and metal-air batteries are plausible green energy devices for replacing conventional fossil fuel-based energy systems. These energy devices demand potential bifunctional electrocatalysts for proficient functions. Therefore, identifying an efficient bifunctional electrocatalyst working in the acidic environment seems promising to realize the practicability. In this line, the carbon-supported Ir 95- x Pd 5 Pt x ( x  = 30, 45, and 65) trimetallic nanoparticles were prepared by both in situ and ex situ methods and studied their oxygen evolution reactions (OER) and oxygen reduction reactions (ORR). The structural and morphological features of Ir 95- x Pd 5 Pt x /C ( x  = 30, 45, and 65) nanoparticles were studied using XRD and TEM analysis. The percentage of Ir 95- x Pd 5 Pt x nanoparticles in the carbon support was revealed by thermogravimetric analyses (TGA) and elemental mapping analysis. Among the prepared compositions, the Ir 50 Pd 5 Pt 45 /C composite synthesized by the in situ method delivers a high limiting current density of 5.151 mA/cm 2 , half-wave potential of 0.931 V vs. RHE, and a Tafel slope of 121 mV/dec for ORR. Similarly, it performed well in oxygen evolution by providing a low overpotential of 380 mV vs. RHE at 10 mA/cm 2 with a Tafel slope of 127 mV/dec. Thus, the in situ synthesized Ir 50 Pd 5 Pt 45 /C can be used as the potential bifunctional electrocatalyst in an acidic environment. Graphical abstract
ISSN:1868-2529
1868-5994
DOI:10.1007/s12678-022-00717-7