Publication: Pyridinic nitrogen induced compressed bilayer graphene for oxygen reduction reaction
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KU Authors
Co-Authors
Cankaya, Mehmet
Titus, Charles James
Lee, Sang Jun
Nordlund, Dennis
Ogasawara, Hirohito
Tekin, Adem
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Abstract
Despite the emergence of nitrogen-doped graphene as a noble-metal free electrocatalyst for oxygen reduction reaction, its participation in the electrochemical conversion mechanism is not well -established. In the present study, functionalities of the nitrogen species on the oxygen reduction activ-ity of bilayer graphene were investigated by combining atom-specific X-ray spectroscopy, Raman spec-troscopy, and density functional theory calculations with electrochemical activity tests in alkaline media. Among various nitrogen species, pyridinic nitrogen as the dominant species improved the electro-chemical activity of bilayer graphene, which was followed by graphene bilayers doped with graphitic nitrogen in majority. Polarization curves revealed a significantly high electrocatalytic oxygen reduction activity of the nitrogen-doped bilayer graphene where the pyridinic nitrogen was the major dopant. This improved activity was confirmed by the lowest overpotential and Tafel slope (78.9 mV/dec). The enhanced interaction of graphene bilayers doped with pyridinic nitrogen is shown to be the main reason for this improvement.(c) 2023 Elsevier Ltd. All rights reserved.
Source
Publisher
Elsevier Sci Ltd
Subject
Chemistry, Physical, Energy, Fuels, Materials science, Multidisciplinary
Citation
Has Part
Source
Materials Today Energy
Book Series Title
Edition
DOI
10.1016/j.mtener.2023.101323