Noble metal nanocluster catalysts for oxygen evolution reaction and water splitting system using the same
AssigneeSK Innovation Co., Ltd.
InventorsHyun Su Han, Ju Hwan Im, Hee Soo Kim, Tae Hong Seok, Seung Ok Lee
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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 even with a very small amount of noble metal in the complicated water splitting reaction that requires high overpotential, and a water splitting system using the same.
Claims20
A catalyst for an oxygen evolution reaction electrode for water splitting, the catalyst comprising:
- a nanostructure containing cobalt hydroxide;
- and
- noble metal nanoclusters dispersed in an amount of 0.5 to 2% by weight, based on a total weight of the catalyst, in the nanostructure.
A method of preparing a catalyst for an oxygen evolution reaction electrode for water splitting, the method comprising operations:
- a) adding a cobalt precursor and a noble metal precursor to an aqueous medium to prepare a precursor solution,
- b) converting the cobalt precursor in the precursor solution into a nanostructure containing cobalt hydroxide by use of a reducing agent to form a product in which noble metal nanoclusters are dispersed in the nanostructure;
- and
- c) recovering the product,
- wherein the noble metal nanoclusters are present in an amount of 0.5 to 2% by weight, based upon the weight of the catalyst.
An oxygen evolution reaction electrode for water splitting, the oxygen evolution reaction electrode comprising:
- an electrode substrate;
- and
- a noble metal nanocluster catalyst loaded on the electrode substrate;
- wherein the noble metal nanocluster catalyst comprises:
- a nanostructure containing cobalt hydroxide, and
- noble metal nanoclusters dispersed in an amount of 0.5 to 2% by weight, based upon a total weight of the catalyst, in the nanostructure.
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,
- the anode comprises a noble metal nanocluster catalyst loaded on an electrode substrate, and
- the noble metal nanocluster catalyst comprises (i) a nanostructure containing cobalt hydroxide, and (ii) noble metal nanoclusters dispersed in an amount of 0.5 to 2% by weight, based upon a total weight of the catalyst, in the nanostructure.
A catalyst comprising:
- a nanostructure including a plurality of nanosheets;
- and
- noble metal nanoclusters dispersed in the nanostructure,
- wherein the nanostructure contains cobalt hydroxide, and
- wherein a weight of the noble metal nanoclusters is 0.5 to 2% by weight of a total weight of the catalyst.
Dependencies are inferred from the claim text.