Mn3O4@CoMn2O4-CoxOy Nanoparticles: Partial Cation Exchange Synthesis and Electrocatalytic Properties toward the Oxygen Reduction and Evolution Reactions.
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.
Catalonia Institute for Energy Research-IREC , Sant Adrià del Besòs, 08930 Barcelona, Spain.
Zhishan
Z
Luo
Catalonia Institute for Energy Research-IREC , Sant Adrià del Besòs, 08930 Barcelona, Spain.
Erdem
E
Irtem
Catalonia Institute for Energy Research-IREC , Sant Adrià del Besòs, 08930 Barcelona, Spain.
Maria
M
Ibáñez
Catalonia Institute for Energy Research-IREC , Sant Adrià del Besòs, 08930 Barcelona, Spain.
Raquel
R
Nafria
Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology (BIST) , Campus UAB, Bellaterra, 08193 Barcelona, Spain.
Sara
S
Martı́-Sánchez
Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology (BIST) , Campus UAB, Bellaterra, 08193 Barcelona, Spain.
Aziz
A
Genç
Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology (BIST) , Campus UAB, Bellaterra, 08193 Barcelona, Spain.
Maria
M
de la Mata
Catalonia Institute for Energy Research-IREC , Sant Adrià del Besòs, 08930 Barcelona, Spain.
Yu
Y
Liu
Catalonia Institute for Energy Research-IREC , Sant Adrià del Besòs, 08930 Barcelona, Spain.
Doris
D
Cadavid
Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya , 08028 Barcelona, Spain.
Jordi
J
Llorca
Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology (BIST) , Campus UAB, Bellaterra, 08193 Barcelona, Spain.|ICREA, Pg. Lluís Companys 23 , 08010 Barcelona, Spain.
Jordi
J
Arbiol
Catalonia Institute for Energy Research-IREC , Sant Adrià del Besòs, 08930 Barcelona, Spain.
Teresa
T
Andreu
Catalonia Institute for Energy Research-IREC , Sant Adrià del Besòs, 08930 Barcelona, Spain.|Departament d'Electronica, Universitat de Barcelona , 08028 Barcelona, Spain.
Joan Ramon
JR
Morante
Catalonia Institute for Energy Research-IREC , Sant Adrià del Besòs, 08930 Barcelona, Spain.|ICREA, Pg. Lluís Companys 23 , 08010 Barcelona, Spain.
Andreu
A
Cabot
OER; ORR; cation exchange; cobalt oxide; colloidal; electrocatalysis; manganese oxide; nanoparticle