Oxygen reduction catalyst and electrochemical cell

Patent metadata

Field	Value
Publication number	US-9364820-B2
Application number	US-201313771729-A
Country	US
Kind code	B2
Filing date	Feb 20, 2013
Priority date	Mar 30, 2012
Publication date	Jun 14, 2016
Grant date	Jun 14, 2016

Abstract

An oxygen reduction catalyst of an embodiment includes: a stack of single-layer graphenes; and a phosphorus compound, wherein some of carbon atoms of the graphenes are replaced by nitrogen atoms, and the phosphorus compound has a peak of phosphorus 2 p orbital of 133.0 to 134.5 eV in X-ray photoelectron spectrum.

First claim

What is claimed is:

1. An electrochemical cell comprising:
a positive electrode;
a negative electrode;
a proton conductive film held between the positive electrode and the negative electrode; and
a power supply applying voltage to the positive electrode and the negative electrode, wherein
the positive electrode or negative electrode includes an oxygen reduction catalyst including a stack of single-layer graphenes and a phosphorus compound,
some of carbon atoms of the graphenes in which are replaced by nitrogen atoms, and
the phosphorus compound has a peak of phosphorus 2p orbital of 133.2 to 134.5 eV in X-ray photoelectron spectrum.

2. The cell according to claim 1 , wherein the electrochemical cell is for a fuel cell.

3. The cell according to claim 1 , wherein the electrochemical cell is for an oxygen-reducing cell or a dehumidifying cell.

4. The cell according to claim 1 , wherein the phosphorus compound is oligophosphate or polyphosphate.

5. The cell according to claim 1 , further comprising iron or cobalt.

6. The cell according to claim 1 , further comprising platinum.

7. An electrochemical cell comprising:
a positive electrode;
a negative electrode;
a proton conductive film held between the positive electrode and the negative electrode; and
a power supply applying voltage to the positive electrode and the negative electrode, wherein
the positive electrode or negative electrode includes an oxygen reduction catalyst including a stack of single-layer graphenes and a phosphorus compound,
some of carbon atoms of the graphenes in which are replaced by nitrogen atoms, and
a peak of phosphorus 2p orbital of the phosphorus compound is shifted by 1.2 to 2.5 eV toward a high-energy side from a peak of phosphorus 2p orbital of tetra-n-butylphosphonium bromide in X-ray photoelectron spectrum.

8. The cell according to claim 7 , wherein the electrochemical cell is for a fuel cell.

9. The cell according to claim 7 , wherein the electrochemical cell is for an oxygen-reducing cell or a dehumidifying cell.

10. The cell according to claim 7 , wherein the phosphorus compound is oligophosphate or polyphosphate.

11. The cell according to claim 7 , further comprising iron or cobalt.

12. The cell according to claim 7 , further comprising platinum.

13. An electrochemical cell comprising:
a positive electrode;
a negative electrode;
a proton conductive film held between the positive electrode and the negative electrode; and
a power supply applying voltage to the positive electrode and the negative electrode, wherein
the positive electrode or negative electrode includes an oxygen reduction catalyst including a stack of single-layer graphenes and a phosphorus compound,
some of carbon atoms of the graphenes in which are replaced by nitrogen atoms, and
the phosphorus compound is oligophosphate or polyphosphate.

14. The cell according to claim 13 , wherein the electrochemical cell is for a fuel cell.

15. The cell according to claim 13 , wherein the electrochemical cell is for an oxygen-reducing cell or a dehumidifying cell.

16. The cell according to claim 13 , further comprising iron or cobalt.

17. The cell according to claim 13 , further comprising platinum.

Assignees

• Toshiba Kk

Inventors

• Naito Katsuyuki
• Nakano Yoshihiko
• Yoshinaga Norihiro
• Matake Shigeru
• Akasaka Yoshihiro

Classifications

• C25B11/04

  characterised by the material · CPC title

• B01J31/0257

  Phosphorus acids or phosphorus acid esters · CPC title

• B01J31/0255 Primary

  Phosphorus containing compounds · CPC title

• B01J31/0265

  Phosphazenes, oligomers thereof or the corresponding phosphazenium salts (polyphosphazenes per se C07F9/067) · CPC title

• B01J31/28

  of the platinum group metals, iron group metals or copper · CPC title