A multilayer structure, of use as composite diffusion layer in a proton-exchange membrane fuel cell, including at least one mat of carbon nanotubes having a unit diameter of less than or equal to 20 nm, defining at least one face of the structure, the mat of carbon nanotubes being superposed on a support based on carbon fibres. It also relates to a process for preparing such a multilayer structure and to the use thereof for an electrode of a PEMFC.

It is described a method for realizing catalytically active electrochemical electrodes with maximized surface area. In the method, InGaN is deposited epitaxially in form of a thin layer on a Silicon substrate exposing a (111) crstal fac, thus forcing the InGaN electrode material to grow exposing a catalytically active surface. The substrate is then removed, the InGaN layer is made into fragments and these are transferred onto a conductive support with one-, two- or three-dimensional structure which can be a wire, a two-dimensional conductive foil which, possibly folded, or a three-dimensional conductive fabric, sponge or cage-like structure. It is thus possible to obtain an InGaN-based electrode with increased surface area and exposing surfaces with high catalytic activity.

An efficient, stable catalyst material having a thin film catalyst supported on a support of metal carbide, nitride, oxide, carbonitride, oxycarbonitride core. The thin film catalyst is covalently bonded to the support.

A positive electrode for metal-air battery, comprising: a plurality of carbon nanotube films comprising a first carbon nanotube layer comprising a plurality of first carbon nanotubes; and a second carbon nanotube layer adjacent to the first carbon nanotube layer and comprising a plurality of second carbon nanotubes, wherein an alignment direction of the plurality of first carbon nanotubes in the first carbon nanotube layer and an alignment direction of the plurality of second carbon nanotubes in the second carbon nanotube layer are different from each other, and wherein an average specific tensile strength of the plurality of carbon nanotube films is greater than or equal to about 0.1 gigapascal per gram per cubic centimeter and less than or equal to about 1 gigapascal per gram per cubic centimeter.

A method for forming a corrosion-resistant catalyst for fuel cell catalyst layers is provided. The method includes a step of depositing a conformal Pt or platinum alloy thin layer on NbO.sub.2 substrate particles to form Pt-coated NbO.sub.2. The Pt-coated NbO.sub.2 particles are then incorporated into a fuel cell catalyst layer.

A method of manufacturing a cathode device includes providing a porous substrate and forming a nitrogen-doped graphene layer in the substrate.

The disclosure relates to a method for coating a substrate with particles, wherein the following method steps are carried out in a vacuum: positioning a substrate surface of the substrate to be coated in a vacuum and in the direction of a region in which there are disposed solid particles with which the substrate surface is to be coated; and; and introducing electrons into the solid particles for electrostatic charging of the solid particles in such a way that a force brought about by the electrostatic charging separates the solid particles from one another and accelerates them in the direction of the substrate surface of the substrate for coating of the substrate surface with at least a portion of the separated solid particles. A device that can be used in accordance with the disclosure has a particle container, a substrate holder and an electron source.

A polymer electrolyte membrane (PEM) fuel cell assembly, and a method for making the assembly, are provided. An exemplary method includes forming a functionalized zeolite templated carbon (ZTC), including forming a CaX zeolite, depositing carbon in the CaX zeolite using a chemical vapor deposition (CVD) process to form a carbon/zeolite composite, treating the carbon/zeolite composite with a solution including hydrofluoric acid to form a ZTC, and treating the ZTC to add catalyst sites, forming the functionalized ZTC. The method further includes incorporating the functionalized ZTC into electrodes, forming a membrane electrode assembly (MEA), and forming the PEM fuel cell assembly.

A metal-doped graphene and a growth method of the same are provided. The metal-doped graphene includes graphene and metal elements, wherein the metal elements accounts for 1-30 at % based on the total content of the metal-doped graphene. The growth method includes performing a PECVD by using a carbon precursor, a metal precursor, and a group VI precursor in order to grow the metal-doped graphene.

A fuel cell electrode includes a substrate having a first surface and a second surface, a passage channel connecting the first surface and the second surface, and a nitrogen-doped graphene layer disposed within the passage channel. The passage channel is formed of a plurality of pores connected to each other.