FLUORINE-DOPED TIN OXIDE SUPPORT AND Pt CATALYST FOR FUEL CELL COMPRISING THE SAME

Patent metadata

Field	Value
Publication number	US-2020335800-A1
Application number	US-202016850750-A
Country	US
Kind code	A1
Filing date	Apr 16, 2020
Priority date	Apr 19, 2019
Publication date	Oct 22, 2020
Grant date	—

Abstract

The present disclosure relates to a fluorine-doped tin oxide support, a platinum catalyst for a fuel cell comprising the same, and a method for producing the same. The present disclosure has a high electrical conductivity and electrochemical durability by doping fluorine to the tin oxide-based support through an electrospinning process. Thus, while resolving a degradation issue of the carbon support in the conventional commercially available platinum/carbon (Pt/C) catalyst, the present disclosure is designed to minimize an electrochemical elution of dopant or tin, which is a limitation of the tin oxide support itself and has excellent performance as a catalyst for a fuel cell.

First claim

What is claimed is:

1 . A fluorine-doped tin oxide support.

2 . The tin oxide support of claim 1 , wherein the tin oxide support is in the form of nanotubes, nanofibers, nanoparticles, or microparticles.

3 . The tin oxide support of claim 1 , wherein the fluorine is doped at 5 to 10 at % based on the total number of atoms of the support.

4 . A platinum catalyst for a fuel cell, comprising:
a platinum nanoparticle; and a fluorine-doped tin oxide support of claim 1 .

5 . The platinum catalyst for a fuel cell of claim 4 , wherein the tin oxide support is a tin oxide nanotube support.

6 . The platinum catalyst for a fuel cell of claim 4 , wherein the platinum nanoparticles are comprised in an amount of 30% to 50% by weight based on the total weight of the catalyst.

7 . The platinum catalyst for a fuel cell of claim 4 , wherein an average particle diameter of the platinum nanoparticles is 2 nm to 5 nm.

8 . The platinum catalyst for a fuel cell of claim 4 , wherein the fluorine-doped tin oxide support is comprised in an amount of 50% to 70% by weight based on the total weight of the catalyst.

9 . An oxidation reduction electrode for a fuel cell comprising the platinum catalyst of claim 4 .

10 . The oxidation reduction electrode for a fuel cell of claim 9 , further comprising one or more selected from graphitic carbon, carbon nanotubes, and graphene as an additive.

11 . The oxidation reduction electrode for a fuel cell of claim 10 , wherein the additive is comprised in an amount of 5% to 15% by weight based on the total weight of the catalyst.

12 . A fuel cell comprising the platinum catalyst of claim 4 .

13 . A method for producing a fluorine-doped tin oxide support of claim 1 , the method comprising:
electrospinning a solution comprising a tin precursor and a fluorine precursor to produce a tin oxide nanofiber doped with fluorine; and heat-treating the nanofiber to produce a nanotube.

14 . The method of claim 13 , wherein the producing of the nanofibers comprises:
adding 5% to 17% by weight of a tin precursor based on the total weight of the solvent and 10% to 23% by weight of a nanotube template material based on the total weight of the solvent to a spinning solvent; and adding and mixing 5% to 40 mol % of a fluorine precursor.

15 . The method of claim 13 , wherein the producing of the nanofibers comprises injecting a solution comprising the tin precursor and the fluorine precursor at 0.3 ml/h to 0.7 ml/h while applying a voltage of 17 kV to 20 kV to spin the solution.

16 . The method of claim 13 , wherein the heat treatment of the nanofibers comprises heat treatment at 500° C. to 700° C. for 1 to 3 hours in an oxygen or air atmosphere.

17 . The method of claim 13 , wherein the heat treatment of the nanofibers removes a nanotube template material.

18 . The method of claim 13 , wherein the tin precursor comprises one or more selected from the group consisting of tin (II) chloride (SnCl 2 ), tin (II) chloride dehydrate (SnCl 2 2H 2 O), tin (IV) chloride pentahydrate (SnCl 2 5H 2 O), hexamethylditin ((CH 3 ) 3 SnSn(CH 3 ) 3 ), trimethyltin chloride ((CH 3 ) 3 SnCl), tributylchlorotin ([CH 3 (CH 2 ) 3 ]3SnCl), and tributyltin chloride ([CH 3 (CH 2 ) 3 ]3SnCl).

19 . The method of claim 13 , wherein the fluorine precursor comprises ammonium fluoride (NH 4 F).

20 . The method of claim 13 , wherein the nanotube template material comprises one or more selected from the group consisting of polyvinylpyrrolidone (PVP), polyvinylidene fluoride (PVdF), polyamides (Nylon), and polyurethane (PU), polyvinyl alcohol (PVA), polysulfone (PSU), polyethylene oxide (PEO), polyacrylonitrile (PAN), polybenzimidazole (PBI), polyaniline (PA), polyimide (PI), polystyrene (PS), polyvinyl chloride (PVC), cellulose acetate, chitosan, silk, collagen, poly-gamma-glutamic acid (PGA), poly lactic acid (PLA), and polycaprolactone (PCL).

Assignees

• Korea Inst Sci & Tech

Inventors

• Kim Jin Young
• Kim Jong Min
• Park Hee-Young
• Lee So Young
• Park Hyun Seo
• Yoo Sung Jong
• Jang Jong Hyun
• Kim Hyoung-Juhn
• Yoon Chang Won
• Han Jonghee

Classifications

• D01F9/08

  of inorganic material (working or processing of metal wire B21F; from softened glass, minerals or slags C03B37/00) · CPC title

• D01D5/0007

  Electro-spinning (non-woven fabrics produced by electro-spinning D04H1/728) · CPC title

• C01G19/02

  Oxides · CPC title

• C01P2004/13

  Nanotubes · CPC title

• C01P2002/54

  one element only · CPC title