Pyridinic nitrogen induced compressed bilayer graphene for oxygen reduction reaction

Navid Solati, Mehmet Çankaya, Abdullah Kahraman, Kaan Şimşek, Charles James Titus, Sang Jun Lee, Dennis Nordlund, Hirohito Ogasawara, Adem Tekin*, Sarp Kaya*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

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 activity of bilayer graphene were investigated by combining atom-specific X-ray spectroscopy, Raman spectroscopy, and density functional theory calculations with electrochemical activity tests in alkaline media. Among various nitrogen species, pyridinic nitrogen as the dominant species improved the electrochemical 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.

Original languageEnglish
Article number101323
JournalMaterials Today Energy
Volume35
DOIs
Publication statusPublished - Jul 2023

Bibliographical note

Publisher Copyright:
© 2023 Elsevier Ltd

Funding

The use of the Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Contract No. DE-AC02-76SF00515. The N.S. M.Ç. A.T. and S.K. would like to thank The Scientific and Technical Research Council of Türkiye (TUBITAK) for support (Grant number: 217M540 and 113Z654). The authors thank KUYTAM for the characterization measurements and the Quantum Sensors Project group at NIST Boulder, CO for their development and support of the TES spectrometer at SSRL BL 10-1. The use of the Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Contract No. DE-AC02-76SF00515. The N.S., M.Ç., A.T., and S.K. would like to thank The Scientific and Technical Research Council of Türkiye (TUBITAK) for support (Grant number: 217M540 and 113Z654 ). The authors thank KUYTAM for the characterization measurements and the Quantum Sensors Project group at NIST Boulder, CO for their development and support of the TES spectrometer at SSRL BL 10-1.

FundersFunder number
KUYTAM
U.S. Department of Energy
Office of Science
Basic Energy SciencesDE-AC02-76SF00515
Türkiye Bilimsel ve Teknolojik Araştırma Kurumu217M540, 113Z654

    Keywords

    • DFT
    • Functionalized graphene
    • Nitrogen doping
    • ORR
    • X-ray spectroscopy

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