Porous amorphous metal oxide-based catalysts for oxygen evolution reaction and water splitting system using the same
AssigneeSK Innovation Co., Ltd.
InventorsHyun Su HAN, Hee Soo KIM, Tae Hong SEOK, Seung Ok LEE, Ju Hwan IM
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Abstract
Disclosed are an electrochemical catalyst capable of lowering the overpotential of the oxygen evolution reaction (OER) during a water splitting reaction in spite of using inexpensive metals (specifically, base metals) instead of conventional noble metal catalysts in the complex water-splitting reactions that require high overpotential, and a water splitting system using the same.
Claims21
A catalyst for an oxygen evolution reaction electrode for water splitting, comprising:
- porous amorphous cobalt oxide;
- and
- 0.5 to 3 at % of at least one P-block element as a dopant, based upon the catalyst.
A method of preparing a catalyst for an oxygen evolution reaction electrode for water splitting, which comprises:
- a) converting a cobalt precursor into cobalt hydroxide by solvothermal synthesis,
- b) heat-treating the solvothermal synthesis product in an oxygen-containing atmosphere at a first heat treatment temperature to form porous amorphous cobalt oxide, and
- c) adding a precursor of at least one P-block element to the porous amorphous cobalt oxide, followed by performing heat treatment under an inert atmosphere at a second heat treatment temperature,
- wherein the porous amorphous cobalt oxide is doped with the at least one P-block element in an amount of 0.5 to 3 at %, based upon the catalyst.
An oxygen evolution reaction electrode for water splitting comprising:
- an electrode substrate;
- and
- a porous amorphous metal oxide-based catalyst loaded on the electrode substrate;
- wherein the porous amorphous metal oxide-based catalyst comprises:
- porous amorphous cobalt oxide;
- and
- 0.5 to 3 at % of at least one P-block element as a dopant, based upon the catalyst.
A water splitting system comprising:
- an anode and a cathode as electrochemical electrodes electrically connected to an external power source;
- and
- an aqueous medium containing an electrolyte,
- wherein, upon application of a voltage from the external power source, oxygen is generated at the anode and hydrogen is generated at the cathode,
- wherein the anode comprises a porous amorphous cobalt oxide-based catalyst loaded on an electrode substrate, and
- the porous amorphous cobalt oxide-based catalyst comprises:
- (i) porous amorphous cobalt oxide;
- and
- (ii) 0.5 to 3 at % of at least one P-block element as a dopant, based upon the catalyst.
A water splitting system comprising:
- an anode including an electrode substrate;
- a cathode including a conductive material;
- an aqueous solution containing an electrolyte;
- and
- a power source,
- wherein a porous amorphous cobalt oxide-based catalyst is loaded on the electrode substrate, and
- wherein the porous amorphous cobalt oxide-based catalyst comprises:
- porous amorphous cobalt oxide;
- and
- at least one P-block element having an atomic percentage from 0.5 to 3% in the porous amorphous cobalt oxide-based catalyst.
Dependencies are inferred from the claim text.