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Electrospun CoFe2O4 nanofibers as bifunctional nanocatalysts for the oxygen evolution and oxygen reduction reactions in alkaline media

Published online by Cambridge University Press:  19 October 2020

P.C. Cintron-Nuñez ,
B. Escobar-Morales ,
J. Escorcia-Garcia Open the ORCID record for J. Escorcia-Garcia [Opens in a new window] ,
F.J. Rodríguez-Varela  and
I.L. Alonso-Lemus
P.C. Cintron-Nuñez
Affiliation:
Sustentabilidad de los Recursos Naturales y Energía, Cinvestav Unidad Saltillo, Av. Industrial Metalúrgica, 1062, C.P. 25900, Ramos Arizpe, Coahuila, México.
B. Escobar-Morales
Affiliation:
CONACYT, Centro de Investigación Científica de Yucatán, Calle 43 No. 130, Col. Chuburná de Hidalgo, Mérida, Yucatán, C.P. 97200, México.
J. Escorcia-Garcia
Affiliation:
CONACYT, Cinvestav Unidad Saltillo, Ingeniería en Cerámica, México.
F.J. Rodríguez-Varela
Affiliation:
Sustentabilidad de los Recursos Naturales y Energía, Cinvestav Unidad Saltillo, Av. Industrial Metalúrgica, 1062, C.P. 25900, Ramos Arizpe, Coahuila, México.
I.L. Alonso-Lemus*
Affiliation:
CONACYT, Cinvestav Unidad Saltillo, Sustentabilidad de los Recursos Naturales y Energía, México.
*
*Email corresponding author: ivalemus@gmail.com
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Abstract

Non-noble metal bifunctional nanocatalysts based on CoFe2O4/C were synthetized by the electrospinning method and evaluated for the Oxygen Evolution Reaction (OER) and the Oxygen Reduction Reaction (ORR). The effect of annealing at different temperatures (T=300, 600 and 900°C) on their morphological and structural features was characterized by XRD, EDS, Raman, FESEM, HRTEM and XPS. The nanofibers annealed at 300 °C (CoFe2O4-300) showed a cubic spinel structure and an average diameter of 42 nm. The CoFe2O4-300/C nanocatalyst demonstrated the highest catalytic activity towards the OER, outperforming the benchmark commercial 20 wt. % Pt/C. Meanwhile all CoFe2O4-based nanocatalysts showed fair catalytic activity for the ORR (Eonset ≈ 0.801 V/RHE, n≈ 3.56, %HO2- ≈ 21-39). In addition, the CoFe2O4/C nanocatalysts demonstrated a higher electrochemical stability than Pt/C for both the ORR and the OER.

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Articles
Information
MRS Advances , Volume 5 , Issue 57-58: International Materials Research Congress XXIX , 2020 , pp. 2929 - 2937
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Copyright
Copyright © The Author(s), 2020, published on behalf of Materials Research Society by Cambridge University Press

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