期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 905, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2022.164156
关键词
Bifunctional electrocatalyst; Oxygen reduction reaction; Oxygen evolution reaction; Bimetallic nanoparticles; Graphene nanoplatelets; Unitized regenerative fuel cell
资金
- Ministry of Education, Science and Technological Development of Republic of Serbia [451-03-68/2022-14/200146]
- Portuguese Foundation for Science and Technology (FCT) [IST-ID/156/2018, UIDP/04540/2020]
In this study, Pt and Pt-M (M = Ni, Fe, Cu) nanoparticles supported on graphene nanoplatelets (GNPs) were synthesized by simultaneous supercritical carbon dioxide deposition method. The morphology analysis revealed the formation of uniformly distributed metal nanoparticles on GNPs, and the XPS analysis determined their oxidation states. PtFe/GNPs exhibited favorable kinetics in both ORR and OER, and its performance was comparable to or even better than that of commercial Pt/C electrocatalyst.
Pt and Pt-M (M = Ni, Fe, Cu) nanoparticles supported on graphene nanoplatelets (GNPs) were synthesized by simultaneous supercritical carbon dioxide deposition method. Morphology analysis by TEM revealed the formation of metal nanoparticles of 2-3 nm size uniformly distributed over GNPs, while XPS was used to determine their oxidation states. Four materials were tested as electrocatalysts for ORR and OER in unitized regenerative fuel cells and rechargeable metal-air batteries. PtFe/GNPs exhibited favorable ORR kinetics in terms of the highest diffusion-limited current density, the lowest Tafel slope, and a high number of ex-changed electrons (n = 3.66), which might be attributed to its high double-layer capacitance and, thus, high electrochemically active surface area. Furthermore, this material performance was comparable to that of commercial Pt/C electrocatalyst containing double the amount of Pt. The same material showed the best performance toward OER as evidenced by the highest current density, the lowest value of exchange current density, and overpotential to reach a current density of 10 mA cm(-2), as well as the lowest Tafel slope. (C) 2022 Elsevier B.V. All rights reserved.
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