A polymer electrolyte fuel cell (PEFC), comprises a first electrode and a second electrode, wherein the first electrode includes a coaxial nanowire electrode. In some embodiments, the coaxial nanowire electrode comprises a plurality of ionomer nanowires, and a catalyst coating that coats at least part of the ionomer nanowires. Moreover, in some embodiments, a nanowire of the plurality of ionomer nanowires and a section of the catalyst coating that coats the nanowire form two coaxial cylinders.

Disclosed is a process for the manufacture of a catalyst-coated membrane-seal assembly, including: (i) providing a carrier material; (ii-i) forming a first layer, the first layer being formed by: (a) depositing a first catalyst component onto the carrier material such that the first catalyst component is deposited in discrete regions; (b) drying the first layer; (ii-ii) forming a second layer, the second layer being formed by: (a) depositing a first seal component, such that the first seal component provides a picture frame pattern having a continuous region and void regions, the continuous region including second seal component and the void regions being free from second seal component; (b) depositing a first ionomer component onto the first layer, such that the first ionomer component is deposited in discrete regions; and (c) drying the second layer.

The present invention provides a substrate film that has a catalyst coating liquid having good coating properties when producing a membrane electrode assembly, has a catalyst layer and support film having good release properties after the catalyst layer is transferred to an electrolyte membrane using a catalyst transfer sheet, and does not contaminate the catalyst layer. Provided is a substrate film for a catalyst transfer sheet, said substrate film being formed by introducing fluorine atoms to at least one surface of a base film formed from one or more types of polymers selected from the group consisting of polyethylene, polypropylene, polyethylene terephthalate, polybutylene terephthalate, polyethylene napthalate, polyphenylene sulfide, polysulf ones, polyether ketone, polyether ether ketone, polyimides, polyetherimide, polyamides, polyamide-imides, polybenzimidazoles, polycarbonates, polyarylates, and polyvinyl chloride, wherein the ratio, measured by X-ray photoelectron spectroscopy, of the number of fluorine atoms/the number of carbon atoms in the surface to which the fluorine atoms are introduced, i.e. the modified surface, is 0.02-1.9, inclusive.

A membrane electrode assembly is provided that includes a polymer electrolyte membrane and a catalyst layer provided on a surface of the polymer electrolyte membrane. The catalyst layer comprises catalyst particles and an ionomer film surrounding each of the catalyst particles. The ionomer film has an oxygen permeability of approximately 6.010.sup.12 mol/cm/s to 15.010.sup.12 mol/cm/s at 80 C. and a relative humidity of approximately 30% to 100%.

Disclosed is a nanotubular intermetallic compound catalyst for a positive electrode of a lithium air battery and a method of preparing the same. In particular, a porous nanotubular intermetallic compound is simply prepared using electrospinning in which a dual nozzle is used, and, by using the same as a catalyst, a lithium air battery having enhanced discharge capacity, charge/discharge efficiency and lifespan is provided.

Disclosed is a method for manufacturing a membrane electrode assembly wherein a fuel cell electrode layer is formed on a material and is transferred to a fuel cell electrolyte membrane. The method includes the steps of: forming a fuel cell electrode layer on a first substrate layer; cutting from the fuel cell electrode layer side using cutting means so as to reach a second substrate layer, and forming a cut of a predetermined shape in the fuel cell electrode layer and the first substrate layer; and a removal step for peeling off an outer side portion of the predetermined shape from the second substrate layer.

Disclosed is a method for manufacturing a membrane electrode assembly wherein a fuel cell electrode layer is formed on a material and is transferred to a fuel cell electrolyte membrane. The method includes the steps of: forming a fuel cell electrode layer on a first substrate layer; cutting from the fuel cell electrode layer side using cutting means so as to reach a second substrate layer, and forming a cut of a predetermined shape in the fuel cell electrode layer and the first substrate layer; and a removal step for peeling off an outer side portion of the predetermined shape from the second substrate layer.

A membrane electrode assembly includes an electrolyte membrane stacked between different electrodes, wherein an ionomer layer of the electrolyte membrane comprises an adjacent electrode, a first layer having at least a same cross-sectional area as that of the adjacent electrode, a reinforcing layer and a second layer stacked at a side of the first layer, the second layer having at least the same cross-sectional area as that of the reinforcing layer.

The following disclosure relates to electrochemical or electrolytic cells. fuel cells. and components thereof. More specifically. the following disclosure relates to applying an intermediate layer, coating layer, or sacrificial layer on a porous transport layer (PTL). A catalyst layer may be applied to the applied intermediate layer. The catalyst layer serves as both a protective passivation layer for the PTL and an oxygen evolution reaction electrocatalyst and the intermediate layer can have a portion removed.

A method for improving freezing resistance of a membrane electrode assembly is provided. In particular, the method improves freezing resistance of a membrane electrode assembly including conducting drying and heat treatment under certain conditions to produce an electrode that reduces formation of macro-cracks and micro-cracks in the electrode. Accordingly, water does not permeate the electrode excessively and the electrode does not break even when frozen.