摘要:
A new composite electrolyte membrane that has excellent hydrogen ion conductivity, and excellent methanol exclusion, a manufacturing method for such a composite electrolyte membrane, and a fuel cell using such a composite electrolyte membrane are provided. The composite electrolyte membrane comprises a hydrogen ion conductive polymer membrane and an exfoliate layer comprising layered hydrogen ion conductive inorganic materials that are disposed on a surface of the polymer membrane.
摘要:
A supported catalyst, an electrode including the catalyst, and a fuel cell using the electrode are provided. The supported catalyst comprises a carbon-based catalyst support, catalytic metal particles that are adsorbed onto a surface of the carbon-based catalyst support, and an ionomer that is chemically or physically adsorbed to the surface of the carbon-based catalyst support and has a functional group on an end that is capable of providing proton conductivity. In the supported catalyst, the catalyst support performs the function of transporting protons in an electrode. When using an electrode prepared using the supported catalyst, a fuel cell having improved energy density and fuel efficiency may be prepared.
摘要:
An electrode catalyst for a fuel cell having comparable electrochemical activity as a platinum electrode catalyst but is much cheaper than the platinum electrode catalyst has a structure in which palladium and at least one metal catalyst selected from the group consisting of nickel, gold, iron, and silver, and combinations thereof, are supported on a tungsten carbide and carbon mesoporous composite support. A membrane electrode assembly and a fuel cell including the electrode catalyst also has comparable electrochemical activity as a platinum electrode catalyst but is also much cheaper than the platinum electrode catalyst.
摘要:
An electrode catalyst for a fuel cell, a membrane electrode assembly including the electrode catalyst, and a fuel cell including the electrode catalyst. The electrode catalyst has excellent electrochemical activity compared to the currently commercially available Pt/C catalyst and is much cheaper than a catalyst using platinum. The electrode catalyst includes tungsten carbide having a specific surface area of about 10 to about 30 m2/g, and a metal catalyst comprising palladium (Pd) or palladium alloy.
摘要:
An electrode catalyst for a fuel cell, a membrane electrode assembly including the electrode catalyst, and a fuel cell including the electrode catalyst. The electrode catalyst has excellent electrochemical activity compared to the currently commercially available Pt/C catalyst and is much cheaper than a catalyst using platinum. The electrode catalyst includes tungsten carbide having a specific surface area of about 10 to about 30 m2/g, and a metal catalyst comprising palladium (Pd) or palladium alloy.
摘要:
A carbon nanosphere has at least one opening. The carbon nanosphere is obtained by preparing a carbon nanosphere and treating it with an acid to form the opening. The carbon nanosphere with at least one opening has higher utilization of a surface area and electrical conductivity and lower mass transfer resistance than a conventional carbon nanotube, thus allowing for higher current density and cell voltage with a smaller amount of metal catalyst per unit area of a fuel cell electrode.
摘要:
A microporous thin film, a method of forming the same and a fuel cell including the microporous thin film, are provided. The microporous thin film includes uniform nanoparticles and has a porosity of at least about 20%. Therefore, the microporous thin film can be efficiently used in various applications such as fuel cells, primary and secondary batteries, adsorbents, and hydrogen storage alloys. The microporous thin film is formed on a substrate, includes metal nanoparticles, and has a microporous structure with porosity of 20% or more.
摘要:
A mesoporous carbon is prepared by mixing a carbon precursor, an acid, and a solvent to obtain a carbon precursor mixture; impregnating an ordered mesoporous silica (OMS) with the carbon precursor mixture; carbonizing the impregnated OMS at 800 to 1300° C. by irradiating microwave energy with a power of 100 to 2000 W thereon to form an OMS-carbon composite; and removing the mesoporous silica from the OMS-carbon composite. The method of preparing a mesoporous carbon can significantly reduce a carbonization time by carbonizing a carbon precursor using microwave energy in a silica template compared to a conventional method using a heat treatment. A supported catalyst and a fuel cell include the mesoporous carbon.
摘要:
The present invention is related to a short carbon nanotube for a catalyst support. In particular, the short carbon nanotube may be opened at both ends, a length of less than about 300 nm, and an aspect ratio in the range of about 1 to about 15. The short carbon nanotube has a broad surface area and better electric conductivity and is opened at both ends, thereby impregnating a metallic catalyst into the inner side of the carbon nanotube. Also, a catalyst impregnated carbon nanotube has a broad effective specific surface area, and thus, has an improved efficiency of catalyst utilization, can reduce an amount of the catalyst used and can efficiently diffuse a fuel. Accordingly, when catalyst impregnated carbon nanotube is used in a fuel cell, etc., improvements can be made in the pricing, power density of an electrode, and energy density of a fuel cell.
摘要:
A method of preparing a supported catalyst, the method comprising mixing a first catalytic metal precursor and a first solvent to obtain a first catalytic metal precursor mixture; mixing a carbon support for catalyst and the first catalytic metal precursor mixture, and drying the mixture to obtain a primary supported catalyst precursor; subjecting the primary supported catalyst precursor to a hydrogen reduction heat treatment, to obtain a primary supported catalyst; mixing the primary supported catalyst and a polyhydric alcohol to obtain a primary supported catalyst mixture; mixing a second catalytic metal precursor and a second solvent to obtain a second catalytic metal precursor mixture; mixing the primary supported catalyst mixture and the second catalytic metal precursor mixture to obtain a secondary supported catalyst precursor mixture; and adjusting the pH of the secondary supported catalyst precursor mixture, and then heating the secondary supported catalyst precursor mixture to obtain a supported catalyst, a supported catalyst prepared by the method, an electrode comprising the supported catalyst, and a fuel cell including the electrode are provided. A supported catalyst having a desired amount of loaded catalytic metal particles can be obtained by preparing a primary supported catalyst containing catalytic metal particles that are obtained by a primary gas phase reduction reaction of a portion of the final loading amount of catalytic metal, and reducing the remaining portion of the catalytic metal by a secondary liquid phase reduction reaction. The supported catalyst contains catalytic metal particles having a very small average particle size, which are uniformly distributed on a carbon support at a high concentration, and thus exhibits maximal catalyst activity. A fuel cell produced using the supported catalyst has improved efficiency.