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Effect of the thermal treatment of Fe/N/C catalysts for the oxygen reduction reaction synthesized by pyrolysis of covalent organic frameworks
Authors:
Álvaro
García
(Instituto de Catálisis y Petroleoquímica, CSIC)
,
Tarrick
Haynes
(Instituto de Catálisis y Petroleoquímica, CSIC)
,
Maria
Retuerto
(Instituto de Catálisis y Petroleoquímica, CSIC)
,
Pilar
Ferrer
(Diamond Light Source)
,
Laura
Pascual
(Instituto de Catálisis y Petroleoquímica, CSIC)
,
Miguel A.
Peña
(nstituto de Catálisis y Petroleoquímica, CSIC)
,
Mohamed
Abdel Salam
(King Abdulaziz University)
,
Mohamed
Mokhtar
(King Abdulaziz University)
,
Diego
Gianolio
(Diamond Light Source)
,
Sergio
Rojas
(Instituto de Catálisis y Petroleoquímica, CSIC)
Co-authored by industrial partner:
No
Type:
Journal Paper
Journal:
Industrial & Engineering Chemistry Research
State:
Published (Approved)
Published:
November 2021
Diamond Proposal Number(s):
24881

Abstract: A nitrogen-containing covalent organic framework obtained from the polymerization of 1,3-dicyanobenzene has been used as a starting material for the synthesis of Fe/N/C catalysts for the oxygen reduction reaction (ORR). In this work we report the effect of the thermal treatments on the nature and catalytic properties of the catalysts obtained after the thermal treatments. After the first thermal treatment, the catalysts obtained contain metallic iron and iron carbide particles, along with a minority fraction of inorganic FeNx sites. After acid leaching and a second thermal treatment, FeNx sites remain in the catalysts, along with a minor fraction of graphite-wrapped Fe3C particles. Both catalysts display high activity for the ORR, with the catalyst subjected to acid leaching and a second thermal treatment, 2HT-1,3DCB, displaying higher ORR activity and a lower production of H2O2. This observation suggests that iron particles, such as Fe3C, display ORR activity but mainly toward the two-electron pathway. On the contrary, FeNx ensembles promote the ORR via the four-electron pathway, that is, via H2O formation.
Journal Keywords: Redox reactions; Iron; Carbon; Catalysts; Leaching
Diamond Keywords: Fuel Cells
Subject Areas:
Chemistry,
Energy
Instruments:
B18-Core EXAFS
Added On:
08/11/2021 08:32
Documents:
acs.iecr.1c02841.pdf
Discipline Tags:
Energy Storage
Energy
Physical Chemistry
Catalysis
Chemistry
Organometallic Chemistry
Technical Tags:
Spectroscopy
X-ray Absorption Spectroscopy (XAS)