A process for producing mixed metal oxides and hydroxides

An electrochemical process for producing crystalline nanoparticles of a mixed metal oxide, mixed metal hydroxide or mixed metal oxide hydroxide reaction product containing at least a first and a second metal ion which are different from each other, the method comprising the steps of (1) supplying to a cathode compartment of an electrochemical cell equipped with a gas diffusion cathode, a liquid feed electrolyte solution containing a first precursor salt of the first metal ion in a first concentration and a second precursor salt of the second metal ion in a second concentration to obtain a reaction mixture; (2) supplying an O2 containing oxidant gas to the cathode, (3) subjecting the cathode to an electrochemical potential which is below the thermodynamic limit of O2 reduction at the pH of the reaction mixture, (4) applying a potential to the electrode to cause reduction of the O2 contained in the oxidant gas to one or more of the corresponding peroxide, OH-, ionic and/or radical reactive O containing species, (5) wherein a ratio RQ of charge Q applied to the cathode relative to the sum of the individual concentrations of the at least one first and second metal ion ([M1] + [M2]) ranges between 100 and 1500 C/mmol, wherein [M1] is the concentration of the first metal ion in the reaction mixture and [M2] is the concentration of the second metal ion in the reaction mixture, and isolating nanoparticles of the reaction product.

Octrooi-publicatienummer: EP3792376

Jaar aanvraag: 2021

Jaar toekenning: 2022

Jaar van publicatie: 2021

Status: Aangevraagd

Technologiedomeinen: Oppervlaktetechniek, coating

Gevalideerd voor IOF-sleutel: Ja

Toegewezen aan: Associatie KULeuven