Spray-pyrolytic tunable structures of mn oxides-based composites for electrocatalytic activity improvement in oxygen reduction
Autori
Varničić, MiroslavaPavlović, Miroslav M.
Eraković Pantović, Sanja
Mihailović, Marija
Pantović Pavlović, Marijana R.
Stopić, Srećko
Friedrich, Bernd
Članak u časopisu (Objavljena verzija)
Metapodaci
Prikaz svih podataka o dokumentuApstrakt
Hybrid nanomaterials based on manganese, cobalt, and lanthanum oxides of different morphology and phase compositions were prepared using a facile single-step ultrasonic spray pyrolysis (USP) process and tested as electrocatalysts for oxygen reduction reaction (ORR). The structural and morphological characterizations were completed by XRD and SEM-EDS. Electrochemical performance was characterized by cyclic voltammetry and linear sweep voltammetry in a rotating disk electrode assembly. All synthesized materials were found electrocatalytically active for ORR in alkaline media. Two different manganese oxide states were incorporated into a Co3O4 matrix, δ-MnO2 at 500 and 600◦C and manganese (II,III) oxide-Mn3O4 at 800◦C. The difference in crystalline structure revealed flower-like nanosheets for birnessite-MnO2 and well-defined spherical nanoparticles for material based on Mn3O4. Electrochemical responses indicate that the ORR mechanism follows a preceding step of MnO2 reduction to MnOOH. T...he calculated number of electrons exchanged for the hybrid materials demonstrate a four-electron oxygen reduction pathway and high electrocatalytic activity towards ORR. The comparison of molar catalytic activities points out the importance of the composition and that the synergy of Co and Mn is superior to Co3O4/La2O3 and pristine Mn oxide. The results reveal that synthesized hybrid materials are promising electrocatalysts for ORR.
Ključne reči:
Cobalt oxide Co3O4 / Electrocatalyst / MnO2 / Oxygen reduction in alkaline media / Perovskite materials / Pt catalyst / Ultrasonic spray pyrolysisIzvor:
Metals, 2022, 12, 1, 22-Izdavač:
- Switzerland : Multidisciplinary Digital Publishing Institute (MDPI)
Finansiranje / projekti:
- Ministarstvo nauke, tehnološkog razvoja i inovacija Republike Srbije, institucionalno finansiranje - 200026 (Univerzitet u Beogradu, Institut za hemiju, tehnologiju i metalurgiju - IHTM) (RS-MESTD-inst-2020-200026)
- Deutscher Akademischer Austauschdienst (57334757)
DOI: 10.3390/met12010022
ISSN: 2075-4701
WoS: 000757385700001
Scopus: 2-s2.0-85121549159
Institucija/grupa
IHTMTY - JOUR AU - Varničić, Miroslava AU - Pavlović, Miroslav M. AU - Eraković Pantović, Sanja AU - Mihailović, Marija AU - Pantović Pavlović, Marijana R. AU - Stopić, Srećko AU - Friedrich, Bernd PY - 2022 UR - https://cer.ihtm.bg.ac.rs/handle/123456789/5371 AB - Hybrid nanomaterials based on manganese, cobalt, and lanthanum oxides of different morphology and phase compositions were prepared using a facile single-step ultrasonic spray pyrolysis (USP) process and tested as electrocatalysts for oxygen reduction reaction (ORR). The structural and morphological characterizations were completed by XRD and SEM-EDS. Electrochemical performance was characterized by cyclic voltammetry and linear sweep voltammetry in a rotating disk electrode assembly. All synthesized materials were found electrocatalytically active for ORR in alkaline media. Two different manganese oxide states were incorporated into a Co3O4 matrix, δ-MnO2 at 500 and 600◦C and manganese (II,III) oxide-Mn3O4 at 800◦C. The difference in crystalline structure revealed flower-like nanosheets for birnessite-MnO2 and well-defined spherical nanoparticles for material based on Mn3O4. Electrochemical responses indicate that the ORR mechanism follows a preceding step of MnO2 reduction to MnOOH. The calculated number of electrons exchanged for the hybrid materials demonstrate a four-electron oxygen reduction pathway and high electrocatalytic activity towards ORR. The comparison of molar catalytic activities points out the importance of the composition and that the synergy of Co and Mn is superior to Co3O4/La2O3 and pristine Mn oxide. The results reveal that synthesized hybrid materials are promising electrocatalysts for ORR. PB - Switzerland : Multidisciplinary Digital Publishing Institute (MDPI) T2 - Metals T1 - Spray-pyrolytic tunable structures of mn oxides-based composites for electrocatalytic activity improvement in oxygen reduction VL - 12 IS - 1 SP - 22 DO - 10.3390/met12010022 ER -
@article{ author = "Varničić, Miroslava and Pavlović, Miroslav M. and Eraković Pantović, Sanja and Mihailović, Marija and Pantović Pavlović, Marijana R. and Stopić, Srećko and Friedrich, Bernd", year = "2022", abstract = "Hybrid nanomaterials based on manganese, cobalt, and lanthanum oxides of different morphology and phase compositions were prepared using a facile single-step ultrasonic spray pyrolysis (USP) process and tested as electrocatalysts for oxygen reduction reaction (ORR). The structural and morphological characterizations were completed by XRD and SEM-EDS. Electrochemical performance was characterized by cyclic voltammetry and linear sweep voltammetry in a rotating disk electrode assembly. All synthesized materials were found electrocatalytically active for ORR in alkaline media. Two different manganese oxide states were incorporated into a Co3O4 matrix, δ-MnO2 at 500 and 600◦C and manganese (II,III) oxide-Mn3O4 at 800◦C. The difference in crystalline structure revealed flower-like nanosheets for birnessite-MnO2 and well-defined spherical nanoparticles for material based on Mn3O4. Electrochemical responses indicate that the ORR mechanism follows a preceding step of MnO2 reduction to MnOOH. The calculated number of electrons exchanged for the hybrid materials demonstrate a four-electron oxygen reduction pathway and high electrocatalytic activity towards ORR. The comparison of molar catalytic activities points out the importance of the composition and that the synergy of Co and Mn is superior to Co3O4/La2O3 and pristine Mn oxide. The results reveal that synthesized hybrid materials are promising electrocatalysts for ORR.", publisher = "Switzerland : Multidisciplinary Digital Publishing Institute (MDPI)", journal = "Metals", title = "Spray-pyrolytic tunable structures of mn oxides-based composites for electrocatalytic activity improvement in oxygen reduction", volume = "12", number = "1", pages = "22", doi = "10.3390/met12010022" }
Varničić, M., Pavlović, M. M., Eraković Pantović, S., Mihailović, M., Pantović Pavlović, M. R., Stopić, S.,& Friedrich, B.. (2022). Spray-pyrolytic tunable structures of mn oxides-based composites for electrocatalytic activity improvement in oxygen reduction. in Metals Switzerland : Multidisciplinary Digital Publishing Institute (MDPI)., 12(1), 22. https://doi.org/10.3390/met12010022
Varničić M, Pavlović MM, Eraković Pantović S, Mihailović M, Pantović Pavlović MR, Stopić S, Friedrich B. Spray-pyrolytic tunable structures of mn oxides-based composites for electrocatalytic activity improvement in oxygen reduction. in Metals. 2022;12(1):22. doi:10.3390/met12010022 .
Varničić, Miroslava, Pavlović, Miroslav M., Eraković Pantović, Sanja, Mihailović, Marija, Pantović Pavlović, Marijana R., Stopić, Srećko, Friedrich, Bernd, "Spray-pyrolytic tunable structures of mn oxides-based composites for electrocatalytic activity improvement in oxygen reduction" in Metals, 12, no. 1 (2022):22, https://doi.org/10.3390/met12010022 . .