Abstract: Disclosed are an electrolyte membrane with improved ion conductivity and enhanced water transport and a method for manufacturing the same. The electrolyte membrane includes an ion transport layer including an ionomer having proton conductivity and a catalyst dispersed in the ion transport layer, and the catalyst includes a support including a shell configured to have a designated shape and size and to be hollow and at least one hole configured to allow an inner space to communicate with an outside therethrough, and a metal supported on the support.

Abstract: Disclosed is an electrolyte membrane for fuel cells including a catalytic composite including a catalytic particle coated with an oxygen-permeable material and a method of producing the same. The electrolyte membrane for fuel cells includes an ion transport layer including an ionomer having proton conductivity and a catalytic composite dispersed in the ion transport layer, and the catalytic composite includes a catalytic particle including a catalytic metal component having activity of decomposing hydrogen peroxide and a coating layer formed on at least a part of a surface of the catalytic particle and including an oxygen-permeable material.

Abstract: Disclosed is an electrolyte membrane for fuel cells including a catalytic composite including a catalytic particle coated with an oxygen-permeable material and a method of producing the same. The electrolyte membrane for fuel cells includes an ion transport layer including an ionomer having proton conductivity and a catalytic composite dispersed in the ion transport layer, and the catalytic composite includes a catalytic particle including a catalytic metal component having activity of decomposing hydrogen peroxide and a coating layer formed on at least a part of a surface of the catalytic particle and including an oxygen-permeable material.

Abstract: The present disclosure relates to an electrolyte membrane for fuel cells including a hydrogen peroxide generating catalyst and a hydrogen peroxide decomposing catalyst, the electrolyte membrane exhibiting highly improved durability, and a method of manufacturing the same. Specifically, the electrolyte membrane includes a support and a catalyst particle including a catalyst metal supported by the support, the catalyst metal including one selected from the group consisting of a first metal having catalyst activity to generate hydrogen peroxide, a second metal having catalyst activity to decompose hydrogen peroxide, and a combination thereof.

Abstract: Disclosed is a catalyst complex for a fuel cell. The catalyst complex includes a support including carbon (C), platinum (Pt) supported on the support, and an iridium (Ir) compound supported on the support, and the iridium compound includes at least one of iridium oxide represented by Chemical Formula 1, IrOx, and iridium-transition-metal oxide represented by Chemical Formula 2, IrMOx, wherein M is a transition metal selected from the group consisting of Fe, Co, Cu, Ni and combinations thereof, and x is from 1 to 2.

Abstract: A water electrolysis system includes a water electrolytic stack, a water reservoir connected to the water electrolytic stack to supply water to the water electrolytic stack, a water circulation pump supplying the water in the water reservoir to the electrolytic stack; and a control unit configured to, during an operation stoppage of the electrolysis system, control the driving of the water circulation pump to convert the water in the electrolytic stack from an acidic condition to a neutral condition and to regulate a unit cell voltage of the electrolytic stack to a voltage such that an electrolysis reaction does not occur and a chemical state of an anode catalyst is stably maintained.

Abstract: Disclosed is a method of manufacturing an electrolyte membrane for fuel cells. The method includes preparing an electrolyte layer including one or more ion conductive polymers that form a proton movement channel, and permeating a gas from a first surface of the electrolyte layer to a second surface of the electrolyte layer.

Abstract: Disclosed are an antioxidant which increases chemical durability of a polymer electrolyte membrane fuel cell (PEMFC) and a method for manufacturing the same. The antioxidant may prevent chemical degradation of the fuel cell and have improved antioxidation capability through a reduction reaction annealing process.

Abstract: Disclosed are a polymer electrolyte membrane for fuel cells which has improved handling properties and mechanical strength by employing symmetric-type laminated composite films and a method for manufacturing the same.

Abstract: Disclosed are an antioxidant for a fuel cell having a high degree of dispersion and/or distribution and excellent antioxidant capability and a membrane-electrode assembly including the same. The antioxidant includes a metal oxide and a sulfur-containing organic compound, for example, an organic compound including a sulfinic acid anion group (R—SO2?), adsorbed on the metal oxide.

Abstract: Disclosed are a polymer electrolyte membrane for a fuel cell, a membrane-electrode assembly including the same, a fuel cell and a method of manufacturing the polymer electrolyte membrane for a fuel cell. Particularly, the polymer electrolyte membrane for a fuel cell may include ionomer layers including a voltage reversal tolerance-increasing additive including a water electrolysis catalyst and an electrical conductor and provided on a porous reinforced film.

Abstract: A fuel cell system capable of improving the chemical durability of a membrane electrode assembly by compensating for the amount of an antioxidant lost within the electrolyte membrane or electrode of the fuel cell stack in such a manner that the antioxidant is provided from an antioxidant supply device, provided in a fuel processing system and/or an air processing system, to a fuel cell stack, in preparation for a case where the antioxidant within the electrolyte membrane or electrode is lost due to the dissolution or migration characteristic of the antioxidant.

Abstract: Disclosed are a polymer electrolyte membrane for fuel cells which has improved handling properties and mechanical strength by employing symmetric-type laminated composite films and a method for manufacturing the same.

Abstract: The present disclosure relates to a membrane-electrode assembly for fuel cells and a method of manufacturing the same, and more particularly to a membrane-electrode assembly to which an electrolyte membrane including a cerium oxide and phosphoric acid functionalized graphene oxide is applied, whereby chemical durability and proton conductivity of the membrane-electrode assembly are improved.

Abstract: Disclosed are a membrane-electrode assembly and a method for manufacturing the same. The membrane-electrode assembly has durability and proton conductivity which are improved by employing an ion conductive polymer having improved chemical durability and ion conductivity.

Abstract: Disclosed are an antioxidant for fuel cells, a membrane electrode assembly including the same and a method for preparing the antioxidant. The antioxidant for fuel cells includes a core including at least one selected from the group consisting of a metal oxide (MxOk) and a complex metal oxide (MxNyOj, N and M being different metals), and an outer portion (e.g., a shell) located on or over a surface of the core and formed by performing reduction treatment of the surface of the core using a thiourea-based compound. The outer portion includes metal cations (M(x-n)+, n being a natural number of 1 or more) having a smaller oxidation number than a valency of the metal (M) of the core.

Abstract: A catalyst complex for fuel cells and a method for manufacturing an electrode including the same are disclosed. The catalyst complex for fuel cells, which is included in an electrode for fuel cells, includes a first catalyst configured to cause hydrogen oxidation reaction (HOR) and a second catalyst configured to cause water electrolysis reaction, i.e., oxygen evolution reaction (OER). The outer surface of the first catalyst is coated with a first ionomer binder, the outer surface of the second catalyst is coated with a second ionomer binder, and an equivalent weight (EW) of the second ionomer binder differs from an equivalent weight (EW) of the first ionomer binder.

Abstract: Disclosed are an antioxidant for fuel cells, a membrane electrode assembly including the same and a method for preparing the antioxidant. The antioxidant for fuel cells includes a core including at least one selected from the group consisting of a metal oxide (MxOk) and a complex metal oxide (MxNyOj, N and M being different metals), and an outer portion (e.g., a shell) located on or over a surface of the core and formed by performing reduction treatment of the surface of the core using a thiourea-based compound. The outer portion includes metal cations (M(x?n)+, n being a natural number of 1 or more) having a smaller oxidation number than a valency of the metal (M) of the core.

Abstract: Disclosed are an electrolyte membrane with improved ion conductivity and enhanced water transport and a method for manufacturing the same. The electrolyte membrane includes an ion transport layer including an ionomer having proton conductivity and a catalyst dispersed in the ion transport layer, and the catalyst includes a support including a shell configured to have a designated shape and size and to be hollow and at least one hole configured to allow an inner space to communicate with an outside therethrough, and a metal supported on the support.

Abstract: Disclosed are an electrolyte membrane for fuel cells that can prevent poisoning of catalysts and a method of producing the same. The electrolyte membrane for fuel cells includes an ion transport layer including an ionomer having proton conductivity, and a catalytic composite dispersed in the ion transport layer, wherein the catalytic composite includes a catalytic particle including a catalytic metal component having an activity of decomposing hydrogen peroxide, and a protective layer formed on at least a part of a surface of the catalytic particle to prevent the ionomer from contacting the catalytic metal component.