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Pàgina inicial > Articles > Articles publicats > Mn₃O₄@CoMn₂O₄-CoₓOy nanoparticles : |
Data: | 2016 |
Resum: | 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. |
Ajuts: | Ministerio de Economía y Competitividad ENE2013-46624-C4-3-R Ministerio de Economía y Competitividad MAT2014-59961 Ministerio de Economía y Competitividad MAT2014-59961-C2-2-R Ministerio de Economía y Competitividad ENE2012-3651 Agència de Gestió d'Ajuts Universitaris i de Recerca FI-2013-B-0076 Agència de Gestió d'Ajuts Universitaris i de Recerca 2013BP-A00344 Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-1638 |
Drets: | Tots els drets reservats. |
Llengua: | Anglès |
Document: | Article ; recerca ; Versió acceptada per publicar |
Matèria: | Cation exchange ; Cobalt oxide ; Colloidal ; Electrocatalysis ; Manganese oxide ; Nanoparticle ; OER ; ORR |
Publicat a: | ACS applied materials & interfaces, Vol. 8, Issue 27 (July 2016) , p. 17435-17444, ISSN 1944-8252 |
Post-Print 6 p, 1.6 MB |