US2016233517A1PendingUtilityA1

Electrode catalyst, composition for forming gas diffusion electrode, gas diffusion electrode, membrane-electrode assembly, and fuel cell stack

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Assignee: N E CHEMCAT CORPPriority: Mar 28, 2014Filed: Mar 27, 2015Published: Aug 11, 2016
Est. expiryMar 28, 2034(~7.7 yrs left)· nominal 20-yr term from priority
Inventors:Kiyotaka NagamoriTomoteru MizusakiYoko NakamuraTakuya TsubakiHiroshi IgarashiYasuhiro Seki
H01M 4/8605H01M 8/1004H01M 4/926H01M 4/8657H01M 4/9041H01M 2008/1095H01M 4/90Y02E60/50H01M 4/86H01M 4/92
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Claims

Abstract

Provided is an electrode catalyst that can exhibit sufficient performance, is suitable for mass production, and is suitable for reducing production costs, even when containing a relatively high concentration of chlorine. The electrode catalyst has a core-shell structure including a support; a core part that is formed on the support; and a shell part that is formed so as to cover at least one portion of the surface of the core part. A concentration of bromine (Br) species of the electrode catalyst as measured by X-ray fluorescence (XRF) spectroscopy is 500 ppm or less, and a concentration of chlorine (Cl) species of the electrode catalyst as measured by X-ray fluorescence (XRF) spectroscopy is 8,500 ppm or less.

Claims

exact text as granted — not AI-modified
1 . An electrode catalyst having a core-shell structure comprising:
 a support;   a core part formed on said support; and   a shell part formed to cover at least a part of a surface of said core part,   
       wherein a concentration of bromine (Br) species is not higher than 500 ppm when measured by X-ray fluorescence (XRF) spectroscopy, and a concentration of chlorine (Cl) species is in a range from 900 ppm to 8,500 ppm when measured by X-ray fluorescence (XRF) spectroscopy. 
     
     
         2 . (canceled) 
     
     
         3 . The electrode catalyst according to  claim 1 , wherein said shell part contains at least one metal selected from platinum (Pt) and a platinum (Pt) alloy, and said core part contains at least one metal selected from the group consisting of palladium (Pd), a palladium (Pd) alloy, a platinum (Pt) alloy, gold (Au), nickel (Ni) and a nickel (Ni) alloy. 
     
     
         4 . The electrode catalyst according to  claim 3 , wherein said support contains an electrically conductive carbon, said shell part contains platinum (Pt) and said core part contains palladium (Pd). 
     
     
         5 . The electrode catalyst according to  claim 1 , wherein said shell part has:
 a first shell part formed to cover at least a part of the surface of said core part; and   a second shell part formed to cover at least a part of a surface of said first shell part.   
     
     
         6 . The electrode catalyst according to  claim 5 , wherein said first shell part contains palladium (Pd), and said second shell part contains platinum (Pt). 
     
     
         7 . A composition for forming a gas diffusion electrode, containing the electrode catalyst as set forth in  claim 1 . 
     
     
         8 . A gas diffusion electrode containing the electrode catalyst as set forth in  claim 1 . 
     
     
         9 . A membrane-electrode assembly (MEA) including the gas diffusion electrode as set forth in  claim 8 . 
     
     
         10 . A fuel cell stack including the membrane-electrode assembly (MEA) as set forth in  claim 9 . 
     
     
         11 . A composition for forming a gas diffusion electrode, containing the electrode catalyst as set forth in  claim 3 . 
     
     
         12 . A composition for forming a gas diffusion electrode, containing the electrode catalyst as set forth-in  claim 4 . 
     
     
         13 . A composition for forming a gas diffusion electrode, containing the electrode catalyst as set forth in  claim 5 . 
     
     
         14 . A composition for forming a gas diffusion electrode, containing the electrode catalyst as set forth in  claim 6 . 
     
     
         15 . A gas diffusion electrode containing the electrode catalyst as set forth in  claim 3 . 
     
     
         16 . A gas diffusion electrode containing the electrode catalyst as set forth in  claim 4 . 
     
     
         17 . A gas diffusion electrode containing the electrode catalyst as set forth in  claim 5 . 
     
     
         18 . A gas diffusion electrode containing the electrode catalyst as set forth in  claim 6 . 
     
     
         19 . A membrane-electrode assembly (MEA) including the gas diffusion electrode as set forth in  claim 15 . 
     
     
         20 . A membrane-electrode assembly (MEA) including the gas diffusion electrode as set forth in  claim 16 . 
     
     
         21 . A membrane-electrode assembly (MEA) including the gas diffusion electrode as set forth in  claim 17 . 
     
     
         22 . A membrane-electrode assembly (MEA) including the gas diffusion electrode as set forth in  claim 18 . 
     
     
         23 . A fuel cell stack including the membrane-electrode assembly (MEA) as set forth in  claim 19 . 
     
     
         24 . A fuel cell stack including the membrane-electrode assembly (MEA) as set forth in  claim 20 . 
     
     
         25 . A fuel cell stack including the membrane-electrode assembly (MEA) as set forth in  claim 21 . 
     
     
         26 . A fuel cell stack including the membrane-electrode assembly (MEA) as set forth in  claim 22 .

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