Electrode for fuel cells

Patent metadata

Field	Value
Publication number	US-2016164129-A1
Application number	US-201514954455-A
Country	US
Kind code	A1
Filing date	Nov 30, 2015
Priority date	Dec 3, 2014
Publication date	Jun 9, 2016
Grant date	—

Abstract

The present invention is to provide a high-performance electrode for fuel cells. Disclosed is an electrode for polymer electrolyte fuel cells, comprising a polymer electrolyte material and a metal catalyst carried on carbon, wherein the polymer electrolyte material is an electrolyte material represented by the following general formula:

and wherein, in a graph showing a relationship between a scattering vector magnitude and a scattering intensity, both of which are obtained by measuring the electrode in an air atmosphere by a smaller-angle neutron scattering method, the electrode has such a hydrophilic domain dispersibility that the maximum value of ratios of scattering intensities to baseline intensities for all ion peaks is in a range of more than 1.00 to 1.42.

First claim

1 . An electrode for polymer electrolyte fuel cells, comprising a polymer electrolyte material and a metal catalyst carried on carbon,
wherein the polymer electrolyte material is an electrolyte material represented by the following general formula (1), and wherein, in a graph showing a relationship between a scattering vector magnitude and a scattering intensity, both of which are obtained by measuring the electrode in an air atmosphere by a smaller-angle neutron scattering method, and defining a scattering intensity and a baseline intensity, both of which appear when the q value is in a range of 1 to 3 nm −1 , as (I spectrum ) and (I baseline ), respectively, the electrode has such a hydrophilic domain dispersibility that a maximum value of ratios of scattering intensities to baseline intensities for all q values is in a range of more than 1.00 to 1.42:

wherein Rf 1 is a perfluoroalkyl group having 1 to 10 carbon atoms, and the perfluoroalkyl group may have an oxygen atom in a molecular chain thereof; Rf 2 is —(CF 2 CF(CF 3 )O) h —(CF 2 ) i — in which h is an integer of 0 to 3 and i is an integer of 1 to 10; x and y are each independently an integer of 1 or more, and x/y is 0.63 to 4.2; and an average molecular weight is 5,000 to 300,000.

Assignees

• Toyota Motor Co Ltd
• Univ Kyoto

Inventors

• Amemiya Kazuki
• Matsunaga Takuro
• Harada Masashi
• Shinohara Akihiro
• Hasegawa Naoki
• Sugiyama Masaaki
• Oba Yojiro
• Sato Nobuhiro

Classifications

• H01M8/1023

  having only carbon, e.g. polyarylenes, polystyrenes or polybutadiene-styrenes · CPC title

• H01M2300/0082

  Organic polymers · CPC title

• H01M8/1004 Primary

  characterised by membrane-electrode assemblies [MEA] (H01M8/12 takes precedence) · CPC title

• H01M2008/1095

  Fuel cells with polymeric electrolytes · CPC title

• H01M8/1039

  halogenated, e.g. sulfonated polyvinylidene fluorides · CPC title