Porphyrin-based catalysts for water splitting

Patent metadata

Field	Value
Publication number	US-2020261897-A1
Application number	US-201916279979-A
Country	US
Kind code	A1
Filing date	Feb 19, 2019
Priority date	Feb 19, 2019
Publication date	Aug 20, 2020
Grant date	—

Abstract

The porphyrin-based catalysts for water splitting are composites of porphyrin or metalloporphyrin active ingredients, conductive carbon (e.g., graphene sheets, vapor grown carbon fiber, carbon black, etc.), and a polymer or binder that may be coated on a glassy carbon electrode. The polymer or binder may be Nafion oil or polyvinylidine difluoride. The porphyrin may be a porphyrin having a transition metal or hydrogen at its center, and may be halogenated and/or have a thiophene substituent.

First claim

We claim:

1 . Porphyrin-based catalysts for water splitting, comprising a composite having a mixture of:
a porphyrin compound; conductive carbon; and a polymer binder.

2 . The porphyrin-based catalysts for water splitting of claim 1 , wherein the porphyrin compound has the formula:

wherein M is H 2 , CO, Ni, Cu, or Zn, and X is F, Cl, or Br.

3 . The porphyrin-based catalysts for water splitting of claim 2 , wherein M is cobalt.

4 . The porphyrin-based catalyst for water splitting of claim 1 , wherein the conductive carbon comprises vapor grown carbon fiber.

5 . The porphyrin-based catalysts for water splitting of claim 1 , wherein the conductive carbon comprises a graphene sheet.

6 . The porphyrin-based catalysts for water splitting of claim 1 , wherein the conductive carbon comprises carbon black.

7 . The porphyrin-based catalysts for water splitting of claim 1 , wherein the polymer binder comprises Nafion oil.

8 . The porphyrin-based catalysts for water splitting of claim 1 , wherein the polymer binder comprises polyvinylidine difluoride (PVDF).

9 . The porphyrin-based catalysts according to claim 1 , wherein said porphyrin compound comprises a central transition metal.

10 . The porphyrin-based catalysts according to claim 1 , wherein said porphyrin compound comprises a thiophene substituent.

11 . The porphyrin-based catalysts according to claim 1 , wherein said porphyrin compound comprises a halogen substituent selected from the group consisting of Cl, Br, and F.

12 . A composite electrode, comprising:
a glassy carbon electrode; and a porphyrin-based catalyst coated on the glassy carbon electrode.

13 . The composite electrode according to claim 12 , wherein the electrode is stable under acidic, neutral, and basic pH conditions.

14 . A method of making a composite electrode with a porphyrin-based catalyst for water splitting, comprising the steps of:
dispersing conductive carbon in an organic solvent to form a first reaction mixture; adding a porphyrin compound to the first reaction mixture to produce a second reaction mixture and mixing the second reaction mixture, the porphyrin compound being a porphyrin-based catalyst for water splitting; adding a polymer solution to the second reaction mixture to produce a third reaction mixture and mixing the third reaction mixture; coating the third reaction mixture onto the surface of a conducting substrate; and drying the conducting substrate.

15 . The method of making a composite electrode of claim 14 , wherein the dispersing and mixing steps comprise ultrasonic mixing using an ultrasonic probe for one hour.

16 . The method of making a composite electrode of claim 14 , wherein the porphyrin compound comprises a central transition metal:

17 . The method of making a composite electrode according to claim 14 , wherein said porphyrin compound has the formula:

wherein M is H 2 , Co, Ni, Cu, or Zn, and X is F, Cl, or Br.

18 . The method of making a composite electrode of claim 17 , wherein M comprises cobalt.

19 . The method of making a composite electrode of claim 14 , wherein the porphyrin compound is a metalloporphyrin having a thiophene substituent.

20 . The method of making a composite electrode according to claim 19 , wherein the thiophene substituent has a halogen substituent selected from the group consisting of Cl, Br, and F.

Assignees

• Univ King Faisal

Inventors

• Abdelsalam Mamdouh E
• Elghamry Ibrahim A

Classifications

• Y02P20/133

  Renewable energy sources, e.g. sunlight · CPC title

• Y02E60/36

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

• C25B11/051

  Electrodes formed of electrocatalysts on a substrate or carrier · CPC title

• B01J31/183 Primary

  with more than one complexing nitrogen atom, e.g. phenanthroline · CPC title

• B01J2531/845

  Cobalt · CPC title