Effect of carbon support on the activity of monodisperse Co 45 Pt 55 nanoparticles for oxygen evolution in alkaline media.

Autor: Andrić S; Faculty of Physical Chemistry, University of Belgrade, Belgrade, Serbia.; Current Affiliation at Center of Microelectronic Technologies, Institute of Chemistry, Technology and Metallurgy, National Institute of the Republic of Serbia, University of Belgrade, Belgrade, Serbia., Milikić J; Faculty of Physical Chemistry, University of Belgrade, Belgrade, Serbia., Sevim M; Department of Chemistry, Faculty of Science, Atatürk University, Erzurum, Türkiye., Santos DMF; Center of Physics and Engineering of Advanced Materials, Laboratory for Physics of Materials and Emerging Technologies, Chemical Engineering Department, Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal., Šljukić B; Faculty of Physical Chemistry, University of Belgrade, Belgrade, Serbia.; Center of Physics and Engineering of Advanced Materials, Laboratory for Physics of Materials and Emerging Technologies, Chemical Engineering Department, Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal.
Jazyk: angličtina
Zdroj: Frontiers in chemistry [Front Chem] 2023 Aug 07; Vol. 11, pp. 1244148. Date of Electronic Publication: 2023 Aug 07 (Print Publication: 2023).
DOI: 10.3389/fchem.2023.1244148
Abstrakt: Oxygen evolution reaction (OER) represents the efficiency-limiting reaction in water electrolyzers, metal-air batteries, and unitized regenerative fuel cells. To achieve high-efficiency OER in alkaline media, we fabricated three novel electrocatalysts by the assembly of as-prepared Co 45 Pt 55 alloy nanoparticles (NPs) on three different carbon-based support materials: reduced graphene oxide (CoPt/rGO), mesoporous graphitic carbon nitride (CoPt/mpg-CN), and commercial Ketjenblack carbon (CoPt/KB). Voltammetry studies revealed that CoPt/rGO electrocatalyst provided lower OER overpotentials accompanied by higher currents and specific current density values than the other two studied materials. Moreover, CoPt/rGO outperformed commercial CoPt/C electrocatalysts in terms of notably higher specific current densities. Additionally, it was found that CoPt/rGO electrocatalyst activity increases with increasing temperature up to 85°C, as suggested by the increase in the exchange current density. Electrochemical impedance spectroscopy studies of three electrocatalysts in OER revealed similar charge transfer resistance, although CoPt/rGO provided a higher current density. The main issue observed during long-term chronoamperometry and chronopotentiometry studies is the materials' instability under OER polarization conditions, which is still to be tackled in future work.
Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
(Copyright © 2023 Andrić, Milikić, Sevim, Santos and Šljukić.)
Databáze: MEDLINE
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