Green Microwave-Assisted Synthesis of CoFeRu-Based Electrocatalyst for the Oxygen Reduction Reaction
Abstract
:1. Introduction
2. Materials and Methods
3. Results and Discussion
3.1. Physica and Structural Characterization
3.2. Electrochemical Studies
- A = geometric area of the glassy carbon disk (0.1963 cm2),
- F = Faraday’s constant (96,485 C mol−1),
- 𝜐 = kinematic viscosity of the electrolyte (0.01 cm2 s−1),
- = diffusion coefficient of O2 in the electrolyte (1.40 × 10−5 cm2 s−1),
- = concentration of O2 in the electrolyte (1.1 × 10−6 mol cm−3),
- ω = electrode rotation velocity (rpm),
- n = number of electrons involved in the oxygen reduction reaction,
- 200 = constant used when ω is expressed in rpm and the current disk (id) in mA.
4. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Electrocatalyst | at.% | ||||
---|---|---|---|---|---|
Co | Fe | Ru | O | C | |
CoFeRu (H2O) | 0.47 | 17.52 | 13.30 | 47.47 | 21.24 |
CoFeRu (H2O/ETG) [26] | 1.70 | 1.70 | 46.60 | 33.00 | 17.00 |
Electrocatalyst | Methanol (mol L−1) | Open Circuit Potential (V/NHE) | Tafel Slope (V dec−1) | Charge Transfer Coefficient | Exchange Current Density (mA cm−2) |
---|---|---|---|---|---|
CoFeRu (H2O) | 0 | 0.811 (0.002) | 0.129 (0.001) | 0.420 (0.004) | 1.36 (0.09) × 10−5 |
2 | 0.823 (0.0006) | 0.126 (0.002) | 0.430 (0.007) | 1.55 (0.19) × 10−5 | |
CoFeRu (ETG/H2O) [26] | 0 | 0.782 | 0.193 | 0.306 | 2.49 × 10−4 |
2 | 0.780 | 0.203 | 0.306 | 3.20 × 10−4 | |
Ru-Fe [35] | 0 | 0.772 | 0.267 | 0.22 | 1.7 × 10−3 |
2 | 0.774 | 0.270 | 0.22 | 2.0 × 10−3 |
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Sandoval, A.; Borja, E.; Magallón, L.; Su, J. Green Microwave-Assisted Synthesis of CoFeRu-Based Electrocatalyst for the Oxygen Reduction Reaction. Materials 2021, 14, 1662. https://doi.org/10.3390/ma14071662
Sandoval A, Borja E, Magallón L, Su J. Green Microwave-Assisted Synthesis of CoFeRu-Based Electrocatalyst for the Oxygen Reduction Reaction. Materials. 2021; 14(7):1662. https://doi.org/10.3390/ma14071662
Chicago/Turabian StyleSandoval, Antonia, Edgar Borja, Lorena Magallón, and Javier Su. 2021. "Green Microwave-Assisted Synthesis of CoFeRu-Based Electrocatalyst for the Oxygen Reduction Reaction" Materials 14, no. 7: 1662. https://doi.org/10.3390/ma14071662