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Spray-Pyrolytic Tunable Structures of Mn Oxides-Based Composites for Electrocatalytic Activity Improvement in Oxygen Reduction
| Content Provider | MDPI |
|---|---|
| Author | Miroslava, Varničić Miroslav, M. Pavlović Sanja, Eraković Pantović Marija, Mihailović Marijana, R. Pantović Pavlović Sre, ćko Stopić Friedrich, Bernd |
| Copyright Year | 2021 |
| Description | 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 $Co_{3}O_{4}$ matrix, $δ-MnO_{2}$ at 500 and 600 °C and manganese (II,III) $oxide-Mn_{3}O_{4}$ at 800 °C. The difference in crystalline structure revealed flower-like nanosheets for $birnessite-MnO_{2}$ and well-defined spherical nanoparticles for material based on $Mn_{3}O_{4}$. Electrochemical responses indicate that the ORR mechanism follows a preceding step of $MnO_{2}$ 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 $Co_{3}O_{4}/La_{2}O_{3}$ and pristine Mn oxide. The results reveal that synthesized hybrid materials are promising electrocatalysts for ORR. |
| Starting Page | 22 |
| e-ISSN | 20754701 |
| DOI | 10.3390/met12010022 |
| Journal | Metals |
| Issue Number | 1 |
| Volume Number | 12 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-12-23 |
| Access Restriction | Open |
| Subject Keyword | Metals Analytical Chemistry Mno2 Cobalt Oxide Co3o4 Perovskite Materials Oxygen Reduction in Alkaline Media Electrocatalyst Ultrasonic Spray Pyrolysis Pt Catalyst |
| Content Type | Text |
| Resource Type | Article |
