Oxygen evolution reaction catalysis

Patent metadata

Field	Value
Publication number	US-12286713-B2
Application number	US-202117328422-A
Country	US
Kind code	B2
Filing date	May 24, 2021
Priority date	Apr 19, 2017
Publication date	Apr 29, 2025
Grant date	Apr 29, 2025

Abstract

An oxygen evolution reaction catalyst is a ternary metal oxide that includes Mn and is represented by Mn u Sb v O w in the rutile crystal phase and M x Mn y O z where M is selected from the group consisting of Ca, Ni, Sr, Zn, Mg, Ni, Ba, Co and where u/(u+v) is greater than 33%.

First claim

The invention claimed is:

1. An electro-oxidation system, comprising:
an oxidation catalyst that includes MnuSbvOw in a ternary rutile crystal phase where u/(u+v) is greater than 55% and w is greater than 0.0;
an electrode comprising a photoactive current collector, wherein the oxidation catalyst is coated on the current collector electrode; and
a bias source connected to the electrode.

2. The system of claim 1 , wherein u/(u+v) is greater than 55% and less than or equal to 70%.

3. The system of claim 1 , wherein the electrode is an anode.

4. The system of claim 3 , wherein the anode contacts an anolyte having a pH less than 3.

5. The system of claim 4 , wherein the oxidation catalyst catalyzes oxygen evolution.

6. An electro-oxidation system, comprising:
an anode that includes one or more components represented by M x Mn y O z where
x, y, and z are each greater than 0.0;
M is selected from the group consisting of Ca, Ni, Sr, Mg, and Co; and
when M is Ca then 0.36≤x/(x+y)≤0.44 and 1.44≤z/(x+y)≤1.76; and
when M is Ni then 0.45≤x/(x+y)≤0.55 and 1.35≤z/(x+y)≤1.65, or 0.77≤x/(x+y)≤0.99 and 1.03≤z/(x+y)≤1.26; and
when M is Sr then 0.45≤x/(x+y)≤0.55 and 1.35≤z/(x+y)≤1.65 and is in an orthorhombic phase; and
when M is Co then 0.45≤x/(x+y)≤0.55 and 1.35≤z/x+y)≤1.65; and
when M is Mg then 0.30≤x/(x+y)≤0.37 and 1.20≤z/(x+y)≤1.47; and

wherein the one or more components comprise a light absorber that absorb light and convert the absorbed light into excited electron-hole pairs during operation of the system so as to generate oxygen.

7. The system of claim 6 , wherein at least one of the one or more components is represented by M x Mn y O z ; and
M x Mn y O z is in a cubic phase when M represents Ni and 0.77≤x/(x+y) ≤0.99;
M x Mn y O z is in a trigonal phase when M represents Ni and 0.45≤x/(x+y) ≤0.55 or when M represent Co;
M x Mn y O z is in a tetragonal phase when M represents Mg; and
M x Mn y O z is in a monoclinic phase when M represents Ca and 1.35≤z/(x+y) ≤1.65.

8. The system of claim 6 , wherein the one or more components are selected from the group consisting of NiMnO 3 in the trigonal phase, SrMnO 3 in the orthorhombic phase, MgMn 2 O 4 in the tetragonal phase, Ni 6 MnO 8 in the cubic phase, CoMnO 3 in the trigonal phase, and Ca 2 Mn 3 O 8 in the monoclinic phase.

9. The system of claim 6 , wherein the anode excludes an Oxygen Evolution Reaction catalyst in addition to the one or more components.

10. The system of claim 6 , wherein the anode contacts an anolyte having a pH less than 3.

11. The system of claim 6 , further comprising:
a bias source that applies a bias at or below 1.23 V vs RHE to the anode.

12. The system of claim 6 , wherein the system generates oxygen.

13. An electro-oxidation system, comprising:
an oxidation catalyst that includes Mn u Sb v O w in a rutile crystal phase where u/(u+v) is greater than 55% and w is greater than 0.0 on an electrode in contact with one or more components to generate oxygen.

Assignees

• California Inst Of Techn

Inventors

• Gregoire John M
• Zhou Lan
• Suram Santosh K
• Shinde Aniketa A
• Haber Joel A
• Guevarra Dan W

Classifications

• C25B1/55

  Photoelectrolysis · CPC title

• C02F2001/46133

  characterised by the material · CPC title

• C02F1/4672

  by electrooxydation · CPC title

• C02F1/46109 Primary

  Electrodes · CPC title

• C02F2001/46142

  Catalytic coating · CPC title