Fluorine-doped tin oxide support and Pt catalyst for fuel cell comprising the same

Patent metadata

Field	Value
Publication number	US-11936052-B2
Application number	US-202016850750-A
Country	US
Kind code	B2
Filing date	Apr 16, 2020
Priority date	Apr 19, 2019
Publication date	Mar 19, 2024
Grant date	Mar 19, 2024

Abstract

Provided is a fluorine-doped tin oxide support, a platinum catalyst for a fuel cell having the same, and a method for producing the same. Also described is 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, what is designed is 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 method for producing a platinum catalyst for a fuel cell, the method comprising:
(a) producing of a solution comprising a tin precursor and a fluorine precursor by comprising:
adding 5% to 17% by weight of the tin precursor based on the total weight of a spinning solvent and 10% to 23% by weight of a nanotube template material based on the total weight of the spinning solvent; and
adding 5% to 40 mol % of a fluorine precursor based on a total number of moles of the spinning solvent;
(b) producing a fluorine-doped tin oxide nanofibers support by electrospinning the solution comprising the tin precursor and the fluorine precursor while injecting the solution at 0.3 ml/h to 0.7 ml/h and applying a voltage of 17 kV to 20 kV;
(c) heat-treating the fluorine-doped tin oxide nanofibers support at 500° C. to 700° C. for 1 to 3 hours in an oxygen or air atmosphere to produce a nanotube, wherein the fluorine is doped at 5 to 8.5 at. % based on the total number of atoms of the fluorine-doped tin oxide nanofibers support; and
(d) supporting platinum nanoparticles on the fluorine-doped tin oxide nanofibers support, and
wherein the nanotube template material comprises one or more selected from the group consisting of polyvinylidene fluoride (PVdF), polyamides (Nylon), polyurethane (PU), polysulfone (PSU), 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).

2. The method of claim 1 , wherein the heat treatment of the fluorine-doped tin oxide nanofibers support removes the nanotube template material.

3. The method of claim 1 , wherein the tin precursor comprises one or more selected from the group consisting of tin (II) chloride (SnCl 2 ), tin (II) chloride dihydrate (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 ] 3 SnCl), and tributyltin chloride ([CH 3 (CH 2 ) 3 ] 3 SnCl).

4. The method of claim 1 , wherein the fluorine precursor comprises ammonium fluoride (NH 4 F).

5. The method of claim 1 , wherein the nanotube template material comprises one or more selected from the group consisting of PVdF, Nylon, PU, PSU, PBI, PA, PI, PS, PVC, cellulose acetate, chitosan, collagen, PGA, PLA, and PCL.

6. The method of claim 1 , wherein in step (c), wherein the fluorine is doped at 5.5 to 8.5 at. % based on the total number of atoms of the fluorine-doped tin oxide nanofibers support.

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

• H01M4/925 Primary

  supported on carriers, e.g. powder carriers · CPC title

• C01G19/02

  Oxides · CPC title

• D01F9/08

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

• H01M4/8673

  Electrically conductive fillers · CPC title

• C01P2002/54

  one element only · CPC title