Abstract: A locomotive has DC or AC traction motors, powered by a hydrogen fuel cell, and optionally other sources such as regenerative braking. The traction motors of the locomotive may be connected to a set of independent DC choppers or AC inverters, linked via a common DC bus, configured to regulate power from the one or more power sources. A manager module, among other functions, may receive inputs and signals to coordinate delivery of electricity from the sources to the motor. A method for retrofitting a legacy locomotive may include removing a generator and a control apparatus configured for diesel fuel, and installing a kit of apparatus configured to be powered by a hydrogen fuel cell. A railway system for use by locomotives powered by hydrogen has one or more hydrogen-generation stations deployed near a track of the railway system.

Abstract: A locomotive has DC or AC traction motors, powered by a hydrogen fuel cell, and optionally other sources such as regenerative braking. The traction motors of the locomotive may be connected to a set of independent DC choppers or AC inverters, linked via a common DC bus, configured to regulate power from the one or more power sources. A manager module, among other functions, may receive inputs and signals to coordinate delivery of electricity from the sources to the motor. A method for retrofitting a legacy locomotive may include removing a generator and a control apparatus configured for diesel fuel, and installing a kit of apparatus configured to be powered by a hydrogen fuel cell. A railway system for use by locomotives powered by hydrogen has one or more hydrogen-generation stations deployed near a track of the railway system.

Abstract: A locomotive has DC or AC traction motors, powered by a hydrogen fuel cell, and optionally other sources such as regenerative braking. The traction motors of the locomotive may be connected to a set of independent DC choppers or AC inverters, linked via a common DC bus, configured to regulate power from the one or more power sources. A manager module, among other functions, may receive inputs and signals to coordinate delivery of electricity from the sources to the motor. A method for retrofitting a legacy locomotive may include removing a generator and a control apparatus configured for diesel fuel, and installing a kit of apparatus configured to be powered by a hydrogen fuel cell. A railway system for use by locomotives powered by hydrogen has one or more hydrogen-generation stations deployed near a track of the railway system.

Abstract: Provided is a power source device for sensor nodes of a ubiquitous sensor network (USN), including a solar cell having a self-powering function, a secondary battery storing electricity generated by the solar cell and supplying the electricity to the sensor nodes of the USN, and an interface circuit interfacing the solar cell with the secondary battery. The solar cell, the secondary battery, and the interface circuit are mounted on the sensor nodes.

Abstract: Provided are a composition for a semiconductor electrode that can be sintered at a low temperature, a manufacturing method thereof, and a dye-sensitized solar cell using the composition. The composition for the semiconductor electrode comprises a colloid solution containing a nanocrystalline oxide material and an aqueous base solution. Even though the composition does not include binders, the composition can be sintered at a low temperature. By coating the composition on a conductive substrate and treating the substrate with a solution of TiCl4, the sintering between the nanoparticles can be reinforced. The dye-sensitized solar cell manufactured using the composition for the semiconductor electrode can have excellent photoelectric conversion efficiency.

Abstract: Provided are an all-solid state primary film battery, and a method of manufacturing the same. The all-solid state primary film battery includes: a first polymer current collector film including a first polymer film and a first conductive layer; a first electrode layer formed on the first conductive layer; a second polymer current collector film that includes a second polymer film and a second conductive layer; a second electrode layer formed on the second conductive layer; and a polymer electrolyte layer including aqua-based electrolytic solution, and is formed between the first electrode layer and the second electrode layer.

Abstract: A method for forming a nanoparticle oxide electrode of a dye-sensitized solar cell is provided. In the method, a basic aqueous solution or an acidic aqueous solution is respectively added to a nanoparticle oxide colloidal solution having a good acidic or basic dispersion, to form a basic nanoparticle oxide paste by an acid-base reaction. Next, after the nanoparticle oxide paste is coated on a substrate, the coated nanoparticle oxide paste is dried at a low temperature of 150° C. or lower. Accordingly, the low-temperature coating nanoparticle oxide paste with high viscosity can be manufactured on the basis of the acid-base reaction, even without the addition of polymer, and accordingly, the nanoparticle oxide electrode can be formed even at a low temperature.

Abstract: Provided is a method of producing a nanoparticle-filled phase inversion polymer electrolyte. The method includes mixing a nanoparticle inorganic filler and a polymer with a solvent to obtain a slurry; casting the obtained slurry to form a membrane; obtaining an inorganic nanoparticle-filled porous polymer membrane by developing internal pores in the cast membrane using a phase inversion method; and impregnating the inorganic nanoparticle-filled porous polymer membrane with an electrolytic solution. The polymer electrolyte produced using the method can be used in a small lithium secondary battery having a high capacity, thereby providing an excellent battery property.

Abstract: A flexible dye-sensitized solar cell is provided. The solar cell is formed by assembling a semiconductor electrode prepared by forming a nanoparticle oxide layer on a first flexible conducting substrate composed of a metal, such as a stainless steel, and allowing a dye to be adsorbed thereon and a counter electrode including a Pt layer formed on a second flexible conducting substrate composed of a transparent polymer. When a semiconductor electrode including an insulating thin film and a conducting thin film formed on the first conducting substrate is used, an energy conversion efficiency of the solar cell can be significantly improved when compared to a conventional flexible solar cell.

Abstract: Provided are a composite polymer electrolyte for a lithium secondary battery in which a composite polymer matrix multi-layer structure composed of a plurality of polymer matrices with different pore sizes is impregnated with an electrolyte solution, and a method of manufacturing the same. Among the polymer matrices, a microporous polymer matrix with a smaller pore size contains a lithium cationic single-ion conducting inorganic filler, thereby enhancing ionic conductivity, the distribution uniformity of the impregnated electrolyte solution, and maintenance characteristics. The microporous polymer matrix containing the lithium cationic single-ion conducting inorganic filler is coated on a surface of a porous polymer matrix to form the composite polymer matrix multi-layer structure, which is then impregnated with the electrolyte solution, to manufacture the composite polymer electrolyte. The composite polymer electrolyte is used in a unit battery.

Abstract: Provided is a cathode composition for lithium secondary battery that includes a lithium-chromium-titanium-manganese oxide that has the formula Li[Li(1-x)/3CrxTi2/3yMn2(1-x-y)/3]O2, where 0?x?0.3, 0?y?0.3 and 0.1?x+y?0.3, and layered ?-LiFeO2 structure. A method of synthesizing the lithium-chromium-titanium manganese oxide includes preparing a first mixed solution by dispersing titanium dioxide (TiO2) in a mixed solution of chrome acetate (Cr3(OH)2(CH3CO2)7) and manganese acetate ((CH3CO2)2Mn.4H2O), adding a lithium hydroxide (LiOH) solution to the first mixed solution to obtain homogeneous precipitates, forming precursor powder that has the formula Li[Li(1-x)/3CrxTi2/3yMn2(1-x-y)/3]O2 where 0?x?0.3, 0?y?0.3 and 0.1?x+y?0.3 by heating the homogeneous precipitates, and heating the precursor powder to form oxide powder having a layered structure.