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

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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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Authors and Affiliations

  1. Sustentabilidad de los Recursos Naturales y Energía, Cinvestav Unidad Saltillo, Av. Industrial Metalúrgica, 1062, C.P. 25900, Ramos Arizpe, Coahuila, México

    P. C. Cintron-Nuñez & F. J. Rodríguez-Varela

  2. CONACYT, Centro de Investigación Científica de Yucatán, Calle 43 No. 130, Col. Chuburná de Hidalgo, Mérida, Yucatán, C.P. 97200, México

    B. Escobar-Morales

  3. Ingeniería en Cerámica, CONACYT, Cinvestav Unidad Saltillo, México

    J. Escorcia-Garcia

  4. Sustentabilidad de los Recursos Naturales y Energía, CONACYT, Cinvestav Unidad Saltillo, México

    I. L. Alonso-Lemus

Authors
  1. P. C. Cintron-Nuñez
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  2. B. Escobar-Morales
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  3. J. Escorcia-Garcia
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  4. F. J. Rodríguez-Varela
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  5. I. L. Alonso-Lemus
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Corresponding author

Correspondence to I. L. Alonso-Lemus.

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Cintron-Nuñez, P.C., Escobar-Morales, B., Escorcia-Garcia, J. et al. Electrospun CoFe2O4 nanofibers as bifunctional nanocatalysts for the oxygen evolution and oxygen reduction reactions in alkaline media. MRS Advances 5, 2929–2937 (2020). https://doi.org/10.1557/adv.2020.380

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