Mn₃O₄@CoMn₂O₄-CoₓOy nanoparticles : Partial cation exchange synthesis and electrocatalytic properties toward the oxygen reduction and evolution reactions
| Autor: | Luo, Zhishan, Irtem, Erdem, Ibáñez, Maria, Nafria, Raquel, Martí-Sánchez, Sara, Genç, Aziz, De La Mata, Maria, Liu, Yu., Cadavid, Doris, Llorca, Jordi, Arbiol i Cobos, Jordi, Andreu, Teresa, Morante, Joan Ramon, Cabot, Andreu |
|---|---|
| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Recercat. Dipósit de la Recerca de Catalunya instname Dipòsit Digital de Documents de la UAB Universitat Autònoma de Barcelona Recercat: Dipósit de la Recerca de Catalunya Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
| Popis: | Mn₃O₄@CoMn₂O₄ nanoparticles (NPs) were produced at low temperature and ambient atmosphere using a one-pot two-step synthesis protocol involving the cation exchange of Mn by Co in preformed Mn₃O₄ NPs. Selecting the proper cobalt precursor, the nucleation of CoₓOy crystallites at the Mn₃O₄@CoMn₂O₄ surface could be simultaneously promoted to form Mn₃O₄@CoMn₂O₄-CoₓOy NPs. Such heterostructured NPs were investigated for oxygen reduction and evolution reactions (ORR, OER) in alkaline solution. Mn₃O₄@CoMn₂O₄-CoₓOy NPs with [Co]/[Mn] = 1 showed low overpotentials of 0.31 V at −3 mA·cm-2 and a small Tafel slope of 52 mV·dec-1 for ORR, and overpotentials of 0.31 V at 10 mA·cm-2 and a Tafel slope of 81 mV·dec-1 for OER, thus outperforming commercial Pt-, IrO2-based and previously reported transition metal oxides. This cation-exchange-based synthesis protocol opens up a new approach to design novel heterostructured NPs as efficient nonprecious metal bifunctional oxygen catalysts. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|