# US 9,751,078 B2 · Non-precious metal based water electrolysis catalyst for oxygen evolution at anode and hydrogen evolution at cathode and preparation method of the same

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- Number: US 9,751,078 B2
- Document ID: US9751078B2
- Status: Granted
- Kind: B2
- Application number: 14/921,567
- Filed: 2015-10-23
- Published: 2016-07-14
- Granted: 2017-09-05
- Earliest claimed: 2015-01-09
- Assignees: Korea Institute of Science and Technology
- Applicants: Korea Institute of Science and Technology
- Inventors: Sung Jong Yoo; Jaeyune Ryu; Jong Hyun Jang; Jin Young Kim; Hyoung-Juhn Kim; Sung Pil Yoon; Jonghee Han; Suk Woo Nam; Tae Hoon Lim
- Web page: https://patentgrep.com/patent/US9751078B2

## CPC

- B01J 27/1853: {with iron, cobalt or nickel}
- B01J 23/75: Cobalt
- B01J 35/58: Fabrics or filaments
- C25B 1/02: Hydrogen or oxygen
- C25B 11/031: Porous electrodes
- C25B 11/051: Electrodes formed of electrocatalysts on a substrate or carrier
- C25B 11/054: Electrodes comprising electrocatalysts supported on a carrier
- C25B 11/057: consisting of a single element or compound
- C25B 11/075: consisting of a single catalytic element or catalytic compound
- C25B 11/077: the compound being a non-noble metal oxide
- B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- C25B: ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR (anodic or cathodic protection C23F13/00; single-crystal growth C30B)
- B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES

## Abstract

Disclosed is a non-precious metal based water electrolysis catalyst represented by CoX/C (X is at least one selected from the group consisting of P, O, B, S and N) for evolution of hydrogen and oxygen at a cathode and anode, respectively, at the same time, the catalyst including a cobalt-containing compound fixed to a carbon carrier.

## Claims

### Claim 1

A non-precious metal based water electrolysis catalyst represented by the following Chemical Formula 1 for evolution of hydrogen and oxygen at a cathode and anode, respectively, the catalyst comprising a cobalt-containing compound fixed to a carbon carrier:
CoX/C [Chemical Formula 1]
wherein X is at least one selected from the group consisting of P, O, B, S and N,
wherein the cobalt-containing compound is nanoparticles surrounded with an amorphous layer having a thickness of 0.1-7 nm, and the amorphous layer comprises Co, X and O.

### Claim 2 (depends on 1)

The non-precious metal based water electrolysis catalyst according to claim 1, wherein X in the above formula is at least one selected from the group consisting of P, B, S and N.

### Claim 3 (depends on 1)

The non-precious metal based water electrolysis catalyst according to claim 1, wherein X in the above formula is P.

### Claim 4 (depends on 1)

The non-precious metal based water electrolysis catalyst according to claim 1, wherein the cobalt-containing compound is nanoparticles having a particle size of 5-100 nm.

### Claim 5 (depends on 1)

The non-precious metal based water electrolysis catalyst according to claim 1, wherein the cobalt-containing compound is nanoparticles having a particle size of 5-30 nm.

### Claim 6 (depends on 1)

The non-precious metal based water electrolysis catalyst according to claim 1, wherein the cobalt-containing compound further has oxide of X on the surface thereof.

### Claim 7 (depends on 1)

The non-precious metal based water electrolysis catalyst according to claim 1, wherein the cobalt-containing compound has phosphate on the surface thereof.

### Claim 8 (depends on 1)

The non-precious metal based water electrolysis catalyst according to claim 1, which is used in an alkaline solvent.

### Claim 9 (depends on 1)

The non-precious metal based water electrolysis catalyst according to claim 1, which has cobalt having an oxidation number of 3 or more through activation at the oxidation potential.

### Claim 10 (depends on 1)

The non-precious metal based water electrolysis catalyst according to claim 1, which is porous and has a nanoweb structure.