Chromium and nickel co-doped ruthenium oxide catalyst for oxygen evolution reaction in acidic media

Patent metadata

Field	Value
Publication number	US-2026085437-A1
Application number	US-202418897369-A
Country	US
Kind code	A1
Filing date	Sep 26, 2024
Priority date	Sep 26, 2024
Publication date	Mar 26, 2026
Grant date	—

Abstract

An oxygen evolution reaction (OER) catalyst for reaction in acidic media comprising: a chromium (Cr) and nickel (Ni) co-doped ruthenium oxide (RuO2) catalyst, and wherein the chromium (Cr) and nickel (Ni) co-doped ruthenium oxide (RuO2) catalyst comprises a Cr and a Ni co-doped in a ruthenium oxide (RuO2). Methods of preparing the OER catalyst are disclosed.

First claim

What is claimed is:

1 . An oxygen evolution reaction (OER) catalyst comprising:
a chromium (Cr) and a nickel (Ni) co-doped ruthenium oxide (RuO 2 ) catalyst, and wherein the chromium (Cr) and the nickel (Ni) co-doped ruthenium oxide (RuO 2 ) catalyst comprises a Ni and a Cr co-doped in a ruthenium oxide (RuO 2 ).

2 . The OER catalyst of claim 1 , wherein Ru (ruthenium) ranges from about 75.0 at % to about 33.3 at %, chromium ranges from about 12.5 at % to about 33.3 at %, and nickel ranges from about 12.5% to about 33.3 at %.

3 . The OER catalyst of claim 1 , wherein the OER catalyst is Ru 0.75 Cr 0.125 Ni 0.125 O 2 .

4 . The OER catalyst of claim 1 , wherein the chromium for doping the ruthenium oxide (RuO 2 ) is from chromium (II) chloride (CrCl 2 ) precursor.

5 . The OER catalyst of claim 1 , wherein the nickel for doping the ruthenium oxide (RuO 2 ) is from nickel(II) chloride hexahydrate (NiCl 2 ·6H 2 O) precursor.

6 . The OER catalyst of claim 1 , wherein the chromium (Cr) and the nickel (Ni) co-doped ruthenium oxide (RuO 2 ) catalyst is a solid solution metal oxide.

7 . The OER catalyst of claim 1 , wherein the chromium (Cr) and the nickel (Ni) co-doped ruthenium oxide (RuO 2 ) catalyst comprises nanoparticles of the chromium (Cr) and the nickel (Ni) co-doped ruthenium oxide (RuO 2 ) catalyst.

8 . The OER catalyst of claim 1 , wherein the OER catalyst has a particle size of less than about 10 nm.

9 . The OER catalyst of claim 1 , wherein the OER catalyst comprises a tetragonal rutile-type structure.

10 . The OER catalyst of claim 1 , wherein the chromium (Cr) and the nickel (Ni) co-doped ruthenium oxide (RuO 2 ) catalyst is at an anode of a proton exchange membrane (PEM) water electrolyzer.

11 . The OER catalyst of claim 1 , wherein the OER catalyst is applicable for an acidic OER.

12 . The OER catalyst of claim 1 , wherein OER activity is performed in an acidic media, wherein the acidic media is perchloric acid.

13 . The OER catalyst of claim 1 , wherein the chromium (Cr) and the nickel (Ni) co-doped ruthenium oxide (RuO 2 ) catalyst increased OER activity as indicated by a decrease in overpotential by about 89 mV at 10 mA/cm 2 as compared to OER activity of a RuO 2 catalyst not co-doped with the chromium and nickel.

14 . The OER catalyst of claim 1 , wherein the chromium (Cr) and the nickel (Ni) co-doped ruthenium oxide (RuO 2 ) catalyst is durable for about 2.5 to about 100 hours.

15 . A proton exchange membrane (PEM) water electrolyzer comprising the OER catalyst of claim 1 .

16 . A method of performing OER catalysis in acidic media, the method comprising an OER catalysis reaction in acidic media, the acidic media comprising an OER catalyst, the OER catalyst comprising:
a nickel (Ni) and chromium (Cr) co-doped ruthenium oxide (RuO 2 ) catalyst, and
wherein the nickel (Ni) chromium (Cr) co-doped ruthenium oxide (RuO 2 ) catalyst comprises a Ni and a Cr co-doped in a ruthenium oxide (RuO 2 ).

Assignees

• Toyota Eng & Mfg North America
• Toyota Motor Co Ltd

Inventors

• Zhou Li Qin
• Wang Siwen
• Roberts Charles A
• Ling Chen

Classifications

• Y02E60/36

  Hydrogen production from non-carbon containing sources, e.g. by water electrolysis · CPC title

• C25B9/23

  comprising ion-exchange membranes in or on which electrode material is embedded · CPC title

• C25B11/0775

  of the rutile type · CPC title

• C25B11/037

  Electrodes made of particles · CPC title

• C25B1/04

  by electrolysis of water · CPC title