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

被引：2

作者：

Cintron-Nunez, P. C. ^{[1
]}

Escobar-Morales, B. ^{[2
]}

Escorcia-Garcia, J. ^{[3
]}

Rodriguez-Varela, F. J. ^{[1
]}

Alonso-Lemus, I. L. ^{[4
]}

机构：

[1] CINVESTAV, Unidad Saltillo, Sustentabilidad Recursos Nat & Energia, Av Ind Met 1062, Ramos Arizpe 25900, Coahuila, Mexico

[2] CONACYT, Ctr Invest Cient Yucatan, Calle 43 130, Merida 97200, Yucatan, Mexico

[3] CINVESTAV, CONACYT, Unidad Saltillo, Ingn Ceram, Ramos Arizpe, Coahuila, Mexico

[4] CINVESTAV, CONACYT, Unidad Saltillo, Sustentabilidad Recursos Nat & Energia, Ramos Arizpe, Coahuila, Mexico

来源：

MRS ADVANCES | 2020年 / 5卷 / 57-58期

关键词：

ELECTROCATALYST; GRAPHENE;

D O I：

10.1557/adv.2020.380

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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 degrees C) on their morphological and structural features was characterized by XRD, EDS, Raman, FESEM, HRTEM and XPS. The nanofibers annealed at 300 degrees 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 (E-onset approximate to 0.801 V/RHE, n approximate to 3.56, %HO2- approximate to 21-39). In addition, the CoFe2O4/C nanocatalysts demonstrated a higher electrochemical stability than Pt/C for both the ORR and the OER.

引用

页码：2929 / 2937

页数：9

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