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

MRS Advances ◽  
2020 ◽  
Vol 5 (57-58) ◽  
pp. 2929-2937
Author(s):  
P.C. Cintron-Nuñez ◽  
B. Escobar-Morales ◽  
J. Escorcia-Garcia ◽  
F.J. Rodríguez-Varela ◽  
I.L. Alonso-Lemus
Keyword(s):  
Catalytic Activity ◽  
Oxygen Reduction ◽  
Oxygen Evolution ◽  
Average Diameter ◽  
Structural Features ◽  
Reduction Reaction ◽  
Alkaline Media ◽  
Oxygen Reduction Reactions ◽  
Electrospinning Method ◽  
Different Temperatures

AbstractNon-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.

Bifunctional OER/ORR catalytic activity in the tetrahedral YBaCo4O7.3 oxide

2019 ◽  
Vol 7 (1) ◽  
pp. 330-341 ◽  
Author(s):  
Maria A. Kirsanova ◽  
Valery D. Okatenko ◽  
Dmitry A. Aksyonov ◽  
Robin P. Forslund ◽  
J. Tyler Mefford ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Oxygen Reduction ◽  
Oxygen Evolution ◽  
Alkaline Media ◽  
Reduction Reactions ◽  
Oxygen Reduction Reactions

Tetrahedral YBaCo4O7.3 demonstrates bifunctional catalytic activity for the oxygen evolution and oxygen reduction reactions in alkaline media.

MOF-derived Fe,Co@N–C bifunctional oxygen electrocatalysts for Zn–air batteries

2020 ◽  
Vol 8 (18) ◽  
pp. 9355-9363 ◽  
Author(s):  
Xinde Duan ◽  
Shuangshuang Ren ◽  
Na Pan ◽  
Mingdao Zhang ◽  
Hegen Zheng
Keyword(s):  
Catalytic Activity ◽  
Oxygen Reduction ◽  
Oxygen Evolution ◽  
High Catalytic Activity ◽  
Reduction Reactions ◽  
Oxygen Reduction Reactions ◽  
Bifunctional Electrocatalysts

MOF-derived Fe,Co@N-C bifunctional electrocatalysts for oxygen reduction reactions and oxygen evolution reactions have been prepared via a scalable method, exhibiting ultra-high catalytic activity and promising performance in Zn–air batteries.

Co3O4 Nanoparticles-Modified α-MnO2 Nanorods Supported on Reduced Graphene Oxide as Cathode Catalyst for Oxygen Reduction Reaction in Alkaline Media

NANO ◽  
2016 ◽  
Vol 11 (11) ◽  
pp. 1650126 ◽  
Author(s):  
GuanHua Jin ◽  
Suqin Liu ◽  
Yaomin Li ◽  
Yang Guo ◽  
Zhiying Ding
Keyword(s):  
Electron Microscopy ◽  
Graphene Oxide ◽  
Catalytic Activity ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reduced Graphene Oxide ◽  
Reduction Reaction ◽  
Alkaline Media ◽  
X Ray ◽  
Reduced Graphene

Development of efficient electrocatalysts for the oxygen reduction reaction (ORR) remains a key issue for the commercialization of metal-air batteries. In this study, the novel structured Co3O4 nanoparticles-modified [Formula: see text]-MnO2 nanorods supported on reduced graphene oxide (Co3O4-MnO2/rGO) were synthesized with varying amounts of [Formula: see text]-MnO2 via a facile two-step hydrothermal method. The relationship between the physical properties and the electrochemical results was investigated using X-ray diffraction spectrum, scanning electron microscopy, transmission electron microscopy, Raman spectroscopy, X-ray photoelectron spectroscopy, cyclic voltammograms, electrochemical impedance spectroscopy and rotating disk electrode. The as-prepared Co3O4–MnO2 nanohybrid exhibits enhanced catalytic activity for ORR under alkaline condition compared with MnO2/rGO and Co3O4/rGO. Furthermore, it mainly favors a direct 4e-reaction pathway for ORR, which is attributed to the well-designed structure, the synergistic effect between Co3O4 and [Formula: see text]-MnO2, and the covalent coupling between the Co3O4-MnO2 and reduced graphene oxide. The role of Co3O4 in Co3O4–MnO2 hybrid for catalyzing ORR also has been illustrated by varying the mass ratio of Co3O4 and MnO2, which reveals that the Co3O4–MnO2 with the ratio of 1:1 has better catalytic activity.

Palladium copper nanosponges for electrocatalytic reduction of oxygen and glucose detection

2015 ◽  
Vol 3 (18) ◽  
pp. 9675-9681 ◽  
Author(s):  
Wen-Ping Wu ◽  
Arun Prakash Periasamy ◽  
Guan-Lin Lin ◽  
Zih-Yu Shih ◽  
Huan-Tsung Chang
Keyword(s):  
Catalytic Activity ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reduction Reaction ◽  
Alkaline Media ◽  
High Catalytic Activity ◽  
Glucose Detection ◽  
Cathode Catalyst ◽  
Electrocatalytic Reduction ◽  
One Pot

One-pot synthesized PdCu nanosponges (NSs) are separately used as a cathode catalyst for the oxygen reduction reaction in alkaline media and for enzymeless detection of glucose with high catalytic activity, stability, and durability.

scholarly journals Insights into the role of an Fe–N active site in the oxygen reduction reaction on carbon-supported supramolecular catalysts

RSC Advances ◽  
2020 ◽  
Vol 10 (15) ◽  
pp. 8709-8716
Author(s):  
Lin Gu ◽  
Yunyun Dong ◽  
Yan Zhang ◽  
Bo Wang ◽  
Qing Yuan ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Active Site ◽  
Active Sites ◽  
Reduction Reaction ◽  
Alkaline Media ◽  
Supramolecular Catalysts

The PPYTZ–Fe/C catalyst containing Fe–N active sites exhibited high ORR catalytic activity and stability in alkaline media with a four-electron pathway progress.

Fe– and Co–P4-embedded graphenes as electrocatalysts for the oxygen reduction reaction: theoretical insights

2015 ◽  
Vol 17 (45) ◽  
pp. 30687-30694 ◽  
Author(s):  
Liyan Feng ◽  
Yuejie Liu ◽  
Jingxiang Zhao
Keyword(s):  
Catalytic Activity ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reduction Reaction ◽  
Alkaline Media ◽  
High Catalytic Activity

Fe–P4-embedded graphene exhibits high catalytic activity for the ORR in alkaline media.

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