Oxygen evolution reaction catalyst and method for its preparation
AssigneeJohnson Matthey Public Limited Company
InventorsAntony PRITCHARD, Amedeo SANTORO, Katharine SMART, Antony WARR, Stephen ZSCHIEGNER
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Abstract
The specification describes a process for preparing an oxygen evolution reaction catalyst, comprising the steps of: (i) combining iridium powder and a peroxide salt to produce a powder mixture; (ii) carrying out thermal treatment on the powder mixture; (iii) dissolving the product from (ii) in water to produce a solution; (iv) reducing the pH of the solution from (iii) to affect a precipitation and form a solid and a supernatant; (v) separating the solid from the supernatant; and (vi) drying the solid. An oxygen evolution catalyst obtainable by the process is also described.
Claims23
A process for preparing an iridium-based oxygen evolution reaction catalyst, comprising the steps of:
- (i) combining iridium powder and a peroxide salt to produce a powder mixture;
- (ii) carrying out thermal treatment on the powder mixture;
- (iii) dissolving the product from (ii) in water to produce a solution;
- (iv) reducing the pH of the solution from (iii) to affect a precipitation and form a solid and a supernatant;
- (v) separating the solid from the supernatant;
- and
- (vi) drying the solid.
An iridium-based oxygen evolution reaction catalyst, wherein:
- the catalyst exhibits a single maxima in its XRD spectrum in the region 20=25-38°;
- the catalyst has a BET surface area of 10-50 m2/g;
- the content of any individual transition metal, other than iridium, is 0-600 ppm when measured by inductively coupled plasma mass spectrometry (ICP-MS).
Dependencies are inferred from the claim text.