High-entropy oxides
AssigneeAuckland Uniservices Limited
InventorsPeng Cao, Yuguang Pu
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Abstract
Disclosed are high-entropy oxides, and methods of their preparation. The high-entropy oxide is characterised by a sub-micron particle size and rod-like particle shape. The method of its preparation includes a co-precipitation step, preferably using an oxalate compound as a precipitating agent. Also disclosed are an electrode, e.g. an anode, a catalyst and an electrochemical cell comprising the high-entropy oxide.
Claims20
A method of preparing a high-entropy oxide, the method comprising:
- (a) mixing a solution comprising at least four elementally different metal cations in a solvent, each metal cation making up at least 5% of the total number of the four or more elementally different metal cations, with a precipitating agent to obtain a solid material comprising the at least four metal cations;
- (b) thermally treating the solid material to obtain a high-entropy oxide;
- wherein the precipitating agent comprises an organic anion.
A method of preparing a high-entropy oxide, the method comprising:
- (a) mixing a solution comprising at least four elementally different metal cations in a solvent, each metal cation making up at least 5% of the total number of the four or more elementally different metal cations, with a precipitating agent to obtain a solid material comprising the at least four metal cations;
- (b) thermally treating the solid material to obtain a high-entropy oxide intermediate;
- (c) mixing the high-entropy oxide intermediate with a solid-state dispersant and annealing the high-entropy oxide intermediate to form the high-entropy oxide.
An oxalate salt comprising four or more elementally different metal cations, each metal cation making up at least 5% of the total number of metal cations.
Dependencies are inferred from the claim text.