التفاصيل البيبلوغرافية
| العنوان: |
Transition metal polyoxometalates with reduced graphene oxide for high-performance air-electrode of metal-air batteries. |
| المؤلفون: |
Gusmão, Filipe M.B.1 (AUTHOR), Đurić, Teodora2 (AUTHOR), Milikić, Jadranka2 (AUTHOR), Radinović, Kristina2 (AUTHOR), Santos, Diogo M.F.1 (AUTHOR), Stanković, Dalibor3,4 (AUTHOR), Šljukić, Biljana1,2 (AUTHOR) biljana.paunkovic@tecnico.ulisboa.pt |
| المصدر: |
International Journal of Hydrogen Energy. Jun2024, Vol. 71, p763-774. 12p. |
| مصطلحات موضوعية: |
*OXYGEN evolution reactions, *METAL-air batteries, *POLYOXOMETALATES, *ENERGY dispersive X-ray spectroscopy, *RAMAN microscopy, *TRANSITION metals, *TRANSMISSION electron microscopy, *GRAPHENE oxide |
| مستخلص: |
The potential of polyoxometalates (POMs) as alternatives to noble metal-based bifunctional electrocatalysts for air electrode, i.e., for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR), was analyzed herein. Five POMs containing transition metal (Mn, Fe, Co, Ni, or Cu) were prepared and combined with reduced graphene oxide (rGO). Kenning structure of POMs with nanolamellae-like morphology and multi-layered graphene sheets of rGO were confirmed by X-ray diffraction, Fourier-transform infrared spectroscopy, scanning electron microscopy with energy dispersive X-ray spectroscopy, transmission electron microscopy and Raman spectroscopy analysis. Different POM:rGO ratios were tested to optimize the composition, and a ratio of 1:5 Ni-POM:rGO was found to be the most electrocatalytically active for OER (Tafel slope as low as 42 mV dec−1, overpotential at 10 mA cm−2 of 354 mV and current density at 400 mV overpotential as high as 83.4 mA cm−2), notably better than IrO 2. As for ORR, Co-POM/rGO carried the lowest Tafel slope of 165 mV dec−1, half-wave potential of 0.711 V and a mixed 2- and 4-electron ORR mechanism. Moreover, these non-precious metal electrocatalysts showed stability in alkaline media with no change in their structure. [Display omitted] • Synergistic effect of transition metal-POM and rGO enhances activity for OER/ORR. • Co-POM/rGO and Ni-POM/rGO outperform IrO 2 as benchmark electrocatalyst for OER. • The price of the catalyst per generated current is lower than in the case of costly IrO 2. • Co-POM/rGO demonstrates the best bifunctional character for ORR/OER. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
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