Oxygen evolution reaction catalysis

Patent metadata

Field	Value
Publication number	US-2018305831-A1
Application number	US-201815957769-A
Country	US
Kind code	A1
Filing date	Apr 19, 2018
Priority date	Apr 19, 2017
Publication date	Oct 25, 2018
Grant date	—

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

1 . A composition of matter, comprising: Mn, Sb, and oxygen arranged in a rutile crystal phase that includes more Mn than Sb.

2 . The composition of matter of claim 1 , wherein the rutile crystal phase consists of the Mn, the Sb, and the oxygen.

3 . The composition of matter of claim 1 , wherein the composition is represented by Mn u Sb v O w where v is greater than w and w is greater than 0.0.

4 . The composition of matter of claim 3 , wherein u/(u+v) is greater than 50% and less than or equal to 70%.

5 . An electro-oxidation system, comprising:
an oxidation catalyst that includes Mn u Sb v O w in the rutile crystal phase where u/(u+v) is greater than 33% and w is greater than 0.0.

6 . The system of claim 5 , wherein u/(u+v) is greater than 55%.

7 . The system of claim 6 , wherein u/(u+v) is greater than 55% and less than or equal to 70%.

8 . The system of claim 5 , wherein the catalyst is included in an anode.

9 . The system of claim 8 , wherein the anode includes a catalytic layer on a current collector and the catalytic layer includes the catalyst.

10 . The system of claim 9 , wherein the current collector is photoactive.

11 . The system of claim 9 , wherein the anode contacts an anolyte having a pH less than 3.

12 . The system of claim 11 , wherein the Mn u Sb v O w catalyzes oxygen evolution.

13 . 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, Zn, Mg, Ni, Ba, Co; and when M is Ca then 0.45≤x/(x+y)≤0.55 and 1.35≤z/(x+y)≤1.65, or 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, Ba, or Co then 0.45≤x/(x+y)≤0.55 and 1.35≤z/(x+y)≤1.65; and when M is Zn, or Mg then 0.30≤x/(x+y)≤0.37 and 1.20≤z/(x+y)≤1.47.

14 . The system of claim 13 , 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 an orthorhombic phase when M represents Ca and 0.45≤x/(x+y)≤0.55 or when M represents Sr; 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 Zn or Mg; M x Mn y O z is in a hexagonal phase when M represents Ba; and M x Mn y O z is in a monoclinic phase when M represents Ca and 1.35≤z/(x+y)≤1.65.

15 . The system of claim 13 , wherein the one or more components are selected from the group consisting of CaMnO 3 in the orthorhombic phase, NiMnO 3 in the trigonal phase, SrMnO 3 in the orthorhombic phase, ZnMn 2 O 4 in the tetragonal phase, MgMn 2 O 4 in the tetragonal phase, Ni 6 MnO 8 in the cubic phase, BaMnO 3 in the hexagonal phase, CoMnO 3 in the trigonal phase, and Ca 2 Mn 3 O 8 in the monoclinic phase.

16 . The system of claim 13 , wherein the anode excludes an Oxygen Evolution Reaction catalyst in addition to the one or more components.

17 . The system of claim 13 , wherein the anode contacts an anolyte having a pH less than 3.

18 . The system of claim 13 , further comprising:
a bias source that applies a bias at or below 1.23 V vs RHE to the anode during operation of the system so as to generate oxygen.

19 . The system of claim 13 , wherein the one or more components absorb light and convert the absorbed light into excited electron-hole pairs during operation of the system so as to generate oxygen.

20 . The system of claim 13 , wherein the one or more components catalyze the oxygen evolution reaction during operation of the system so as 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

• C02F2001/46142

  Catalytic coating · CPC title

• C25B1/003

  Chemistry & Metallurgy · mapped topic

• C02F1/46109 Primary

  Electrodes · CPC title

• C25B11/0452 Primary

  Chemistry & Metallurgy · mapped topic

• C02F2001/46133

  characterised by the material · CPC title