Publication date: 8th June 2021
Oxides nanocrystals (NCs) showing a spinel-like (direct or inverse) structure have attracted much attention due to the capability of controlling the overall electrocatalytic activity by playing with the size, shape and composition of the NCs.[1] It has been widely reported that replacing divalent atoms from the pristine structure by other transition metal atoms such as Fe, Ni or Co boosts the catalytic activity of the NCs boosted. [1,2] In the case of Mn3O4, Mn2+ can be replaced by Ni2+ in order to enhance the catalytic activity for oxygen-evolution and oxygen-reduction reactions (OER and ORR respectively). Herein we report on the colloidal synthesis of Ni-dopped Mn3O4 NCs for OER and ORR electrocatalysis. The shape, size and composition of the NCs was precisely controlled by a ligand-mediated approach. For instance, by using manganese acetate (II), nickel acetylacetonate (II) and oleylamine at 100 oC NCs showing a quasi-spherical shape were produced. By adding oleic acid to the above mentioned mix and increase the temperature at 250 oC the shape of the NCs evolves from a quasi-spherical to a hyperbranched structure. Finally, flower-like Ni-Mn-O NCs were synthesized when it was added 1-octadecanol. All the samples were tested for OER and ORR showing evidences over the key importance to control NCs size and shape.
This research was funded by the Spanish government (MICIU) and the Catalan Agency of Competitiveness (ACCIO) through the RTI2018-102006-J-I00, ENE2016-77798-C4-1-R, PID2019-105490RB-C32 and 2019-LLAV-00051 projects. P.G. acknowledges financial the Spanish government (MICIU) through the Ramon y Cajal research program (RyC2019-028414-I). J. C. acknowledges financial support by the MICINN through the fellowship (Grants for pre-doctoral contracts for the training of doctors 2020).
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