US2018001305A1PendingUtilityA1

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

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Assignee: N E CHEMCAT CORPPriority: Sep 18, 2015Filed: Sep 7, 2016Published: Jan 4, 2018
Est. expirySep 18, 2035(~9.1 yrs left)· nominal 20-yr term from priority
Inventors:Kiyotaka NagamoriTomoteru MizusakiYoko NakamuraHiroshi IgarashiYasuhiro Seki
B01J 23/44H01M 4/92H01M 8/1004H01M 4/86H01M 8/10C01G 55/005H01M 8/141B01J 23/89G01N 23/223Y02E60/50H01M 4/9058H01M 4/926H01M 4/925H01M 4/9075H01M 4/9041H01M 2008/1095H01M 4/8657
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Claims

Abstract

Provided is an electrode catalyst in which the contents of chlorine (Cl) species and bromine (Br) species are reduced to a predetermined level or lower, capable of exhibiting sufficient catalyst performance. The electrode catalyst has a core-shell structure including a support, a core part formed on the support and a shell part formed to cover at least a part 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 400 ppm or less, and a concentration of chlorine (Cl) species of the electrode catalyst as measured by X-ray fluorescence (XRF) spectroscopy is 900 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 the support; and   a shell part formed to cover at least a part of a surface of the core part,   wherein the shell part includes a single-layered structure formed to cover at least a part of the surface of the core part, or a two-layered structure including a first shell part formed to cover at least a part of the surface of the core part, and a second shell part formed to cover at least a part of the surface of the first shell part,   wherein in a case of the single-layered shell part, the shell part comprises platinum (Pt), and the core part comprises palladium (Pd), whilst in a case of the two-layered shell part, the first shell part comprises palladium (Pd), and the second shell part comprises platinum (Pt),   wherein a concentration of bromine (Br) species measured by X-ray fluorescence (XRF) spectroscopy, is not greater than 400 ppm, and   wherein a concentration of chlorine (Cl) species measured by X-ray fluorescence (XRF) spectroscopy, is not greater than 900 ppm.   
     
     
         2 . The electrode catalyst according to  claim 1 , wherein the concentration of bromine (Br) species is not greater than 300 ppm. 
     
     
         3 . The electrode catalyst according to  claim 2 , wherein the concentration of bromine (Br) species is not greater than 200 ppm. 
     
     
         4 . The electrode catalyst according to  claim 1 , wherein the concentration of chlorine (Cl) species is less than 900 ppm. 
     
     
         5 . The electrode catalyst according to  claim 1 , wherein the concentration of chlorine (Cl) species is equal to or greater than 0 ppm. 
     
     
         6 . The electrode catalyst according to  claim 1 , wherein the concentration of chlorine (Cl) species is not less than 100 ppm. 
     
     
         7 - 14 . (canceled) 
     
     
         15 . The electrode catalyst according to  claim 1 , wherein, in a case of the two-layered shell part, the core part contains one or more metal elements other than noble metals as a main component(s). 
     
     
         16 . (canceled) 
     
     
         17 . A composition for forming a gas diffusion electrode, comprising the electrode catalyst according to  claim 1 . 
     
     
         18 . A gas diffusion electrode comprising the electrode catalyst according to  claim 1 . 
     
     
         19 . A membrane-electrode assembly (MEA) comprising the gas diffusion electrode according to  claim 18 . 
     
     
         20 . A fuel cell stack comprising the membrane-electrode assembly (MEA) according to  claim 19 . 
     
     
         21 . The electrode catalyst according to  claim 2 , wherein the concentration of chlorine (Cl) species is less than 900 ppm. 
     
     
         22 . The electrode catalyst according to  claim 3 , wherein the concentration of chlorine (Cl) species is less than 900 ppm. 
     
     
         23 . The electrode catalyst according to  claim 2 , wherein the concentration of chlorine (Cl) species is equal to or greater than 0 ppm. 
     
     
         24 . The electrode catalyst according to  claim 3 , wherein the concentration of chlorine (Cl) species is equal to or greater than 0 ppm. 
     
     
         25 . The electrode catalyst according to  claim 4 , wherein the concentration of chlorine (Cl) species is equal to or greater than 0 ppm. 
     
     
         26 . The electrode catalyst according to  claim 21 , wherein the concentration of chlorine (Cl) species is equal to or greater than 0 ppm. 
     
     
         27 . The electrode catalyst according to  claim 22 , wherein the concentration of chlorine (Cl) species is equal to or greater than 0 ppm. 
     
     
         28 . The electrode catalyst according to  claim 2 , wherein the concentration of chlorine (Cl) species not less than 100 ppm. 
     
     
         29 . The electrode catalyst according to  claim 3 , wherein the concentration of chlorine (Cl) species not less than 100 ppm. 
     
     
         30 . The electrode catalyst according to  claim 4 , wherein the concentration of chlorine (Cl) species not less than 100 ppm. 
     
     
         31 . The electrode catalyst according to  claim 21 , wherein the concentration of chlorine (Cl) species not less than 100 ppm. 
     
     
         32 . The electrode catalyst according to  claim 22 , wherein the concentration of chlorine (Cl) species not less than 100 ppm.

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