Disclosed are an electrode for a vanadium redox flow battery and a vanadium redox flow battery comprising same. The disclosed electrode for a vanadium redox flow battery comprises: a first carbon fiber having a diameter of 9-11 ㎛; and a second carbon fiber having a diameter of 6-8 ㎛.
Disclosed are a gas diffusion layer and a fuel cell comprising same. The gas diffusion layer has a horizontal gas permeability (InP) of 10 to 100×10-12m2and a vertical gas permeability (ThP) of 0.02 to 1×10}-12m2.
H01M 8/1004 - Éléments à combustible avec électrolytes solides caractérisés par les ensembles membrane-électrodes [MEA]
H01M 8/10 - Éléments à combustible avec électrolytes solides
3.
GAS DIFFUSION LAYER COMPRISING MICROPOROUS LAYER CONTAINING RADICAL SCAVENGER INCLUDING CERIUM OXIDE PARTICLES HAVING CONTROLLED SHAPE, AND FUEL CELL EMPLOYING SAME
Provided is a gas diffusion layer for a fuel cell. The gas diffusion layer comprises a carbon substrate and a microporous layer formed on the carbon substrate. The microporous layer contains carbon particles and a water-repellent resin that binds the carbon particles. The microporous layer contains a radical scavenger including nano-sized cerium oxide particles that have a controlled particle shape, which is rectangular parallelepiped, a cube, an octahedron, or a polyhedron having nine or more surfaces, and are doped with at least one non-metallic element selected from among nitrogen, phosphorus, sulfur, chlorine, and fluorine and/or at least one metal element selected from among La, Pr, Sm, Eu, Gd, Y, Zr, and Nb. The gas diffusion layer can effectively improve the durability of a fuel cell manufactured using same.
H01M 8/1004 - Éléments à combustible avec électrolytes solides caractérisés par les ensembles membrane-électrodes [MEA]
H01M 4/86 - Électrodes inertes ayant une activité catalytique, p. ex. pour piles à combustible
H01M 8/10 - Éléments à combustible avec électrolytes solides
4.
Gas diffusion layer comprising microporous layer including carbon having partially graphitized structure and radical scavenger additive, and fuel cell employing the same
Provided a gas diffusion layer for fuel cells, the gas diffusion layer including: a carbon substrate; and a microporous layer formed on the carbon substrate, wherein the microporous layer comprises first carbon particles having a partially graphitized structure and a water-repellent binder resin binding the first carbon particles, and the microporous layer further comprises a cerium compound, a nitrogen-doped cerium compound, nitrogen-doped second carbon particles having a partially graphitized or non-graphitized structure, or a mixture of two or more, as a radical scavenger capable of removing hydrogen peroxide generated at a fuel cell open circuit potential or a higher potential. In the membrane electrode assembly and the fuel cell each employing the gas diffusion layer having excellent durability according to one or more embodiments, chemical or electrochemical degradation may be effectively prevented over a long period of time, and thus excellent electrochemical performance may be obtained over a long period of time. This leads to an extended lifetime of the fuel cell.
H01M 8/0245 - Composites sous forme de produits en couches ou enrobés
H01M 8/1004 - Éléments à combustible avec électrolytes solides caractérisés par les ensembles membrane-électrodes [MEA]
5.
Gas diffusion layer including microporous layer having through passages and/or concentration gradient of water-repellent resin in thickness direction, and fuel cell including the same
Provided is a gas diffusion layer, in which a microporous layer has an inner wall of through passages and a region adjacent to the through passages containing a greater amount of a water-repellent binder resin than a region not adjacent to the through passages, and thus water formed by an electrochemical reaction is effectively discharged from the gas diffusion layer. When the gas diffusion layer of the present invention is used, an optimal water management may be possible for smooth operation under all humidity conditions including a high humidity condition and a low humidity condition, and thus a fuel cell having improved cell performance may be obtained.
A carbon substrate for a gas diffusion layer of a fuel cell, the carbon substrate being a porous carbon substrate having a first surface and a second surface opposite the first surface, the carbon substrate includes a plurality of carbon fibers arranged irregularly to form a non-woven type and a carbide of an organic polymer located between the carbon fibers to bind the carbon fibers to each other, the carbide has a graphite structure, and the carbon substrate has a Bragg diffraction angle 2θ of less than 26.435° and a interplanar distance d(002) of less than 3.372 Å, a gas diffusion layer employing the same, an electrode for a fuel cell, a membrane electrode assembly for a fuel cell, and a fuel cell. When the gas diffusion layer is manufactured using the carbon substrate according to the present disclosure, cell voltage characteristics of the fuel cell may be greatly improved.
Disclosed are a carbon substrate for a gas diffusion layer of a fuel cell, a gas diffusion layer employing the same, an electrode for a fuel cell, a membrane electrode assembly for a fuel cell, and a fuel cell, wherein the carbon substrate includes a plate-shaped substrate having an upper surface and a lower surface opposite the upper surface, and the plate-shaped substrate includes carbon fibers arranged to extend in one direction (extend unidirectionally) and a carbide of an organic polymer located between the carbon fibers to bind the carbon fibers to each other. Since the carbon substrate according to the present disclosure includes carbon fibers aligned in at least one direction selected from a machine direction (MD) and a cross-machine direction (CMD) by controlling the alignment of carbon fibers, the carbon substrate has excellent mechanical strength, particularly, bending strength, even if its thickness is thin, and thus it is possible to effectively prevent the intrusion phenomenon of the gas diffusion layer into the flow path of the metal separator, and has excellent gas flow characteristics.
Disclosed are a carbon substrate for a gas diffusion layer and a gas diffusion layer comprising same, a gas diffusion layer employing same, an electrode for a fuel cell, a membrane electrode assembly for a fuel cell, and a fuel cell, wherein as a carbon substrate for a gas diffusion layer of a fuel cell, the carbon substrate is a porous carbon substrate having a first surface and a second surface opposite to the first surface; the carbon substrate comprises a plurality of carbon fibers which are disorderedly disposed to form a non-woven fabric, and a carbide of an organic polymer disposed between the carbon fibers to connect same; the carbide has a graphite structure; and the carbon substrate has a Bragg diffraction angle (2θ) of 26.435 degrees or less and a interplanar spacing d (002) of (002) plane being 3.372Å or less. The gas diffusion layer manufactured by using the carbon substrate according to the present invention can largely improve cell voltage properties of a fuel cell.
Disclosed are a carbon substrate for a fuel cell gas diffusion layer, a gas diffusion layer comprising same, a gas diffusion layer employing same, a fuel cell electrode, a fuel cell membrane electrode assembly, and a fuel cell, the carbon substrate comprising a sheet-shaped substrate having an upper surface and a lower surface on the opposite side thereof, wherein the sheet-shaped substrate comprises carbon fibers which are unidirectionally extended and arranged and an organic polymer carbide between the carbon fibers, binding the carbon fibers to each other. The carbon substrate comprises carbon fibers, which are aligned in at least any one direction, having been selected from among a machine direction (MD) and a cross-machine direction (CMD), by controlling the alignment of carbon fibers, and thus the carbon substrate is thin but has excellent mechanical strength and, particularly, excellent flexural strength, thereby enabling effective prevention of the penetration of a gas diffusion layer into a metal separator channel, and has excellent gas flow characteristics.
H01M 8/0245 - Composites sous forme de produits en couches ou enrobés
H01M 4/86 - Électrodes inertes ayant une activité catalytique, p. ex. pour piles à combustible
D01F 9/12 - Filaments de carboneAppareils spécialement adaptés à leur fabrication
H01M 8/1004 - Éléments à combustible avec électrolytes solides caractérisés par les ensembles membrane-électrodes [MEA]
10.
Carbon substrate for gas diffusion layer, gas diffusion layer using the same, and electrode for fuel cell, membrane-electrode assembly and fuel cell comprising the gas diffusion layer
A carbon substrate for a gas diffusion layer that has a porosity gradient in a thickness direction thereof, a gas diffusion using the carbon substrate, an electrode and a membrane-electrode assembly for a fuel cell that include the gas diffusion layer, and a fuel cell including the membrane-electrode assembly having the gas diffusion layer are provided. The gas diffusion layer has improved water discharge ability and improved bending strength both in the machine direction and cross-machine direction.
D21H 13/12 - Fibres organiques non cellulosiques à partir de composés macromoléculaires obtenus par des réactions faisant intervenir uniquement des liaisons non saturées carbone-carbone
D21H 15/02 - Pâte ou papier comprenant des fibres ou des matériaux formant des nappes caractérisés autrement que par leur constitution chimique caractérisés par leur configuration
C04B 35/52 - Produits céramiques mis en forme, caractérisés par leur compositionCompositions céramiquesTraitement de poudres de composés inorganiques préalablement à la fabrication de produits céramiques à base de non oxydes à base de carbone, p. ex. graphite
C04B 35/56 - Produits céramiques mis en forme, caractérisés par leur compositionCompositions céramiquesTraitement de poudres de composés inorganiques préalablement à la fabrication de produits céramiques à base de non oxydes à base de carbures
C04B 35/80 - Fibres, filaments, "whiskers", paillettes ou analogues
C04B 35/83 - Fibres de carbone dans une matrice carbonée
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