CoOx-Fe3O4/N-rGO Oxygen Reduction Catalyst for Anion-Exchange Membrane Fuel Cells
نویسندگان
چکیده
Platinum group metal (PGM)-free oxygen reduction reaction (ORR) catalysts are of utmost importance for the rapid development anion-exchange membrane fuel cell (AEMFC) technology. In this work, we demonstrate improved ORR performance and stability Co Fe oxide-decorated/N-doped reduced graphene oxide (CoOx-Fe3O4/N-rGO) prepared via a hydrothermal method at low temperature 150 °C. The were characterized thoroughly using transmission electron microscopy, high-angle annular dark field-scanning X-ray diffraction, N2 physisorption, Raman spectroscopy, photoelectron spectroscopy to obtain information about morphology, elemental distribution, phases, porosity, defects, surface compositions. Significant activity improvement (130 [email protected] mA cm−2) was achieved with catalyst compared pristine oxide, limiting current even 12%@0.5 V higher than commercial Pt/C. enhanced CoOx-Fe3O4/N-rGO attributed uniform dispersion Co, Fe, N on (rGO) sheets. Furthermore, accelerated stress tests revealed excellent durability, suggesting that material could be promising durable catalyst. With cathode layer catalyst, peak power density 676 mW cm−2 in an operando H2-O2 AEMFC. To best our knowledge, is highest reported per mass PGM-free Finally, quantified various polarization losses as function loadings insights future work AEMFCs based AEMFC can synergistic effects (i) high turnover frequency transition metals (Co Fe) (ii) enhancement provided by doping distribution stability.
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ژورنال
عنوان ژورنال: Energies
سال: 2023
ISSN: ['1996-1073']
DOI: https://doi.org/10.3390/en16083425