10 results about "Polymer electrolyte fuel cells" patented technology

The present invention provides: a novel additive containing an ionic liquid that can be used for a composition for forming a cathode catalyst layer of a polymer electrolyte fuel cell; a novel composition for forming a cathode catalyst; and a novel cathode catalyst layer formed using the same.　The present invention relates to a composition for forming a cathode catalyst layer of a polymer electrolyte fuel cell, the composition containing an ionic liquid represented by formula (1). In the formula, X represents an atomic group containing a nitrogen atom or a phosphorus atom; Y represents a hydrogen atom, a carboxy group, or a sulfonic acid group; Z-represents a hydrogen sulfate anion, a trifluoromethanesulfonate anion, a bis(trifluoromethylsulfonyl)imide anion, a halogen anion, a tetrafluoroborate anion, a hexafluorophosphate anion, a bis(fluorosulfonyl)imide anion, or a nonafluorobutanesulfonate anion; and n represents an integer of 2-4.

The C / SiC composite particle contains a porous carbon particle and SiC particles distributed on the inner wall surface of the pores of the porous carbon particle. Such a C / SiC composite particle can be obtained by: producing a silica / carbon composite A by causing carbon to be deposited within the pores of a porous silica particle; producing a silica / carbon composite B by removing a portion of the silica from the silica / carbon composite A; heat-treating the silica / carbon composite B to graphitize the carbon; and simultaneously generating SiC. The electrode catalyst contains C / SiC composite particles and catalyst particles supported on the surface of the C / SiC composite particles. Furthermore, a polymer electrolyte fuel cell contains such an electrode catalyst as a cathode catalyst or an anode catalyst.

The present invention provides: a carbon material for a catalyst support of a polymer electrolyte fuel cell, said carbon material being composed of porous activated carbon black and satisfying the following requirements (A) to (D); a catalyst layer using the same; and a fuel cell.　(A) The adsorption amount at a relative pressure of 0.1 is 100 mL / g to 250 mL / g.　(B) The nitrogen adsorption amount for pores having a pore diameter of 2 nm to 6 nm as obtained by subtracting the nitrogen adsorption amount at a relative pressure of 0.218 from the nitrogen adsorption amount at a relative pressure of 0.671 is 50 mL / g to 300 mL / g.　(C) The difference obtained by subtracting the adsorption amount at a relative pressure of 0.8 according to an adsorption isotherm from the adsorption amount at a relative pressure of 0.8 according to a desorption isotherm is 50 mL / g or less.　(D) The line width of a peak appearing near 1580 cm-1 in a Raman spectrum is 70 cm-1 to 84 cm-1.

Provided are: a carbon material which is for a catalyst carrier of a polymer electrolyte fuel cell, and which is composed of a porous activated carbon black and satisfies the following requirements (A)-(C); a catalyst layer for a polymer electrolyte fuel cell using the carbon material; and a fuel cell.　(A) A BET specific surface area SBET is 410 m2 / (g) to 1.000 m2 / (g).　(B) A peak intensity ratio ID / IG of a D-band peak intensity ID to a G-band peak intensity IG is 1.2 to 2.2.　(C) A full width at half maximum ΔG of a G band peak is 72 cm-1 to 83 cm-1.

To provide a method for selecting a combination of platinum or platinum alloy-supported carbon (Pt / C) particles and a solvent that can calculate the amount or rate of adsorption of an ionomer that allows the Pt / C particles to be well dispersed in a solvent, even when the types of the Pt / C particles are different, and that can obtain a catalyst ink that is less likely to generate bubbles, has excellent storage stability, and has good viscosity.SOLUTION: A method for selecting platinum or platinum alloy-supported carbon particles and a solvent for use in a catalyst ink for polymer electrolyte fuel cells includes selecting the Pt / C particles and the solvent such that the amount of ionomer adsorbed on the Pt / C particles is 0.22 to 0.50 in terms of the mass ratio (I / C) of the adsorbed ionomer to carbon, which is expressed by a predetermined formula, and the hydrogen bond term of the Hansen solubility parameter of the solvent is 40.0 MPa0.5 or less.SELECTED DRAWING: None

The present invention provides an electrolyte material which can form crack-resistant catalyst layers when used in membrane electrode assemblies and enables provision of fuel cells having good power generation characteristics, a membrane electrode assembly and a polymer electrolyte fuel cell. The electrolyte material of the present invention is made of a polymer having ion exchange groups comprising units based on tetrafluoroethylene, units having an ion exchange group and no cyclic ether structure, units having a cyclic ether structure and units based on a monomer having at least two polymerizable unsaturated bonds.

This catalyst carrier carbon material for a solid polymer electrolyte fuel cell comprises porous activated carbon black satisfying the following requirements (A) to (C).　(A) The pore volume VA20 of pores having a pore diameter of 20 nm or less is 0.45-0.80 mL / g.　(B) The pore volume VA1.5 of pores having a pore diameter of 1.5 nm or less is 0.005-0.045 mL / g.　(C) The pore volume VD5-6 of pores having a diameter of 5-6 nm is 0.004-0.035 mL / g.