US2015221953A1PendingUtilityA1

Non-carbon mixed-metal oxide support for electrocatalysts

55
Individually held — no corporate assignee on recordPriority: Jan 31, 2014Filed: Jan 31, 2014Published: Aug 6, 2015
Est. expiryJan 31, 2034(~7.5 yrs left)· nominal 20-yr term from priority
Inventors:Vijay K. RamaniEllazar NiangarNilesh DaleTaehee Han
H01M 2008/1095H01M 4/925H01M 4/9075H01M 4/8817Y02E60/50
55
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Claims

Abstract

A non-carbon support particle is provided for use in electrocatalyst. The non-carbon support particle consists essentially of titanium dioxide and ruthenium dioxide. The titanium and ruthenium can have a mole ratio ranging from 1:1 to 9:1 in the non-carbon support particle. Also disclosed are methods of preparing the non-carbon support and electrocatalyst taught herein.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A non-carbon support particle for use in electrocatalyst, consisting essentially of titanium dioxide and ruthenium dioxide. 
     
     
         2 . The non-carbon support particle of  claim 1 , wherein titanium and ruthenium have a 1:1 mole ratio in the non-carbon support particle. 
     
     
         3 . The non-carbon support particle of  claim 1 , wherein titanium and ruthenium have a mole ratio between 9:1 and 1:1 in the non-carbon support particle. 
     
     
         4 . The non-carbon support particle of  claim 1 , wherein the titanium dioxide has a first particle size and the ruthenium dioxide has a second particle size, the first particle size and the second particle size being substantially equal. 
     
     
         5 . The non-carbon support particle of  claim 1 , wherein a surface of the non-carbon support particle is a modified surface comprising one or more of defects and functional groups configured to promote adhesion of an active catalyst particle. 
     
     
         6 . An electrocatalyst, comprising non-carbon support particles of  claim 1  and further comprising precious metal active catalyst particles deposited onto the non-carbon support particles. 
     
     
         7 . The electrocatalyst of  claim 6 , wherein the precious metal active catalyst particles are platinum. 
     
     
         8 . An electrode for a fuel cell, comprising the electrocatalyst of  claim 6 . 
     
     
         9 . A method of preparing a non-carbon support particle for use in electrocatalyst comprising:
 dispersing titanium dioxide nanopowder in liquid and mixing for a first period of time;   precipitating ruthenium hydroxide on the titanium dioxide nanopowder to form non-carbon support particles consisting essentially of titanium dioxide and ruthenium dioxide;   filtering the non-carbon support particles from the liquid; and   drying the non-carbon support particles.   
     
     
         10 . The method of  claim 9 , further comprising calcining the non-carbon support particles in air. 
     
     
         11 . The method of  claim 10 , wherein the calcining is performed at 450° C. 
     
     
         12 . The method of  claim 9 , wherein precipitating ruthenium hydroxide comprises:
 adding ruthenium chloride hydrate to the liquid and further mixing for a second period of time; and   adjusting a pH of the solution to seven.   
     
     
         13 . The method of  claim 9 , wherein the non-carbon support particles consist essentially of a 1:1 mole ratio of titanium dioxide and ruthenium dioxide. 
     
     
         14 . The method of  claim 9 , wherein titanium and ruthenium have a mole ratio between 9:1 and 1:1 in the non-carbon support particle. 
     
     
         15 . The method of  claim 9 , wherein the titanium dioxide has a first particle size and the ruthenium dioxide has a second particle size, the first particle size and the second particle size being substantially equal. 
     
     
         16 . The method of  claim 9 , further comprising:
 modifying a surface of the dried non-carbon support particles with a chemical process configured to promote adhesion of active catalyst particles.   
     
     
         17 . The method of  claim 9 , further comprising:
 increasing a surface area of the dried non-carbon support particles with mechanical milling.   
     
     
         18 . The method of  claim 16 , further comprising:
 increasing a surface area of the dried non-carbon support particles with mechanical milling prior to modifying the surface.   
     
     
         19 . A method of preparing a non-carbon electrocatalyst comprising the method of  claim 9 , and further comprising depositing precious metal active particles on the non-carbon support particles by reducing an active catalyst precursor with acid. 
     
     
         20 . The method of  claim 19 , wherein the precious metal active particles are platinum particles.

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