The main objective of this research was a systematic development of advanced micro/nanostructured materials based on the most used metal-oxides for ORR and metal-oxides with an extremely low-loading of Pt for comparison. Hybrid composites compared were: MnO2, La2O3, mixed lanthanum manganese oxides (LMO), and mixed lanthanum manganese oxides with reduced platinum load (LMO-Pt). The influence of the reduced amount of noble metal, as well as single oxide activity toward ORR, was analyzed. The complete electrochemical performance of the hybrid materials has been performed by means of CV, LSV, and EIS. It was shown that all synthesized catalytic materials were ORR-active with noticeable reduction currents in O2 saturated 0.1 M KOH. The ORR behavior indicated that the La2O3 electrode has a different mechanism than the other tested electrode materials (MnO2, LMO, and LMO-Pt). The EIS results have revealed that the ORR reaction is of a mixed character, being electrochemically and diffusion co...ntrolled. Even more, diffusion is of mixed character due to transport of O2 molecules and the chemical reaction of oxygen reduction. O2 diffusion was shown to be the dominant process for MnO2, LMO, and LMO-Pt electrolytic materials, while chemical reaction is the dominant process for La2O3 electrolytic materials.
TY - JOUR
AU - Panić, Stefan
AU - Pantović Pavlović, Marijana
AU - Varničić, Miroslava
AU - Tadić, Vojin
AU - Stopić, Srećko
AU - Friedrich, Bernd
AU - Pavlović, Miroslav M.
PY - 2022
UR - https://cer.ihtm.bg.ac.rs/handle/123456789/5598
AB - The main objective of this research was a systematic development of advanced micro/nanostructured materials based on the most used metal-oxides for ORR and metal-oxides with an extremely low-loading of Pt for comparison. Hybrid composites compared were: MnO2, La2O3, mixed lanthanum manganese oxides (LMO), and mixed lanthanum manganese oxides with reduced platinum load (LMO-Pt). The influence of the reduced amount of noble metal, as well as single oxide activity toward ORR, was analyzed. The complete electrochemical performance of the hybrid materials has been performed by means of CV, LSV, and EIS. It was shown that all synthesized catalytic materials were ORR-active with noticeable reduction currents in O2 saturated 0.1 M KOH. The ORR behavior indicated that the La2O3 electrode has a different mechanism than the other tested electrode materials (MnO2, LMO, and LMO-Pt). The EIS results have revealed that the ORR reaction is of a mixed character, being electrochemically and diffusion controlled. Even more, diffusion is of mixed character due to transport of O2 molecules and the chemical reaction of oxygen reduction. O2 diffusion was shown to be the dominant process for MnO2, LMO, and LMO-Pt electrolytic materials, while chemical reaction is the dominant process for La2O3 electrolytic materials.
PB - MDPI AG
T2 - Catalysts
T1 - Rare-Earth/Manganese Oxide-Based Composites Materials for Electrochemical Oxygen Reduction Reaction
VL - 12
IS - 6
SP - 641
DO - 10.3390/catal12060641
ER -
@article{
author = "Panić, Stefan and Pantović Pavlović, Marijana and Varničić, Miroslava and Tadić, Vojin and Stopić, Srećko and Friedrich, Bernd and Pavlović, Miroslav M.",
year = "2022",
abstract = "The main objective of this research was a systematic development of advanced micro/nanostructured materials based on the most used metal-oxides for ORR and metal-oxides with an extremely low-loading of Pt for comparison. Hybrid composites compared were: MnO2, La2O3, mixed lanthanum manganese oxides (LMO), and mixed lanthanum manganese oxides with reduced platinum load (LMO-Pt). The influence of the reduced amount of noble metal, as well as single oxide activity toward ORR, was analyzed. The complete electrochemical performance of the hybrid materials has been performed by means of CV, LSV, and EIS. It was shown that all synthesized catalytic materials were ORR-active with noticeable reduction currents in O2 saturated 0.1 M KOH. The ORR behavior indicated that the La2O3 electrode has a different mechanism than the other tested electrode materials (MnO2, LMO, and LMO-Pt). The EIS results have revealed that the ORR reaction is of a mixed character, being electrochemically and diffusion controlled. Even more, diffusion is of mixed character due to transport of O2 molecules and the chemical reaction of oxygen reduction. O2 diffusion was shown to be the dominant process for MnO2, LMO, and LMO-Pt electrolytic materials, while chemical reaction is the dominant process for La2O3 electrolytic materials.",
publisher = "MDPI AG",
journal = "Catalysts",
title = "Rare-Earth/Manganese Oxide-Based Composites Materials for Electrochemical Oxygen Reduction Reaction",
volume = "12",
number = "6",
pages = "641",
doi = "10.3390/catal12060641"
}
Panić, S., Pantović Pavlović, M., Varničić, M., Tadić, V., Stopić, S., Friedrich, B.,& Pavlović, M. M.. (2022). Rare-Earth/Manganese Oxide-Based Composites Materials for Electrochemical Oxygen Reduction Reaction. in Catalysts
MDPI AG., 12(6), 641.
https://doi.org/10.3390/catal12060641
Panić S, Pantović Pavlović M, Varničić M, Tadić V, Stopić S, Friedrich B, Pavlović MM. Rare-Earth/Manganese Oxide-Based Composites Materials for Electrochemical Oxygen Reduction Reaction. in Catalysts. 2022;12(6):641.
doi:10.3390/catal12060641 .
Panić, Stefan, Pantović Pavlović, Marijana, Varničić, Miroslava, Tadić, Vojin, Stopić, Srećko, Friedrich, Bernd, Pavlović, Miroslav M., "Rare-Earth/Manganese Oxide-Based Composites Materials for Electrochemical Oxygen Reduction Reaction" in Catalysts, 12, no. 6 (2022):641,
https://doi.org/10.3390/catal12060641 . .
