The present disclosure relates to a polymer electrolyte membrane for medium and high temperature, a preparation method thereof and a high-temperature polymer electrolyte membrane fuel cell including the same, more particularly to a technology of preparing a composite membrane including an inorganic phosphate nanofiber incorporated into a phosphoric acid-doped polybenzimidazole (PBI) polymer membrane by adding an inorganic precursor capable of forming a nanofiber in a phosphoric acid solution when preparing phosphoric acid-doped polybenzimidazole and using the same as a high-temperature polymer electrolyte membrane which is thermally stable even at high temperatures of 200-300° C. without degradation of phosphoric acid and has high ion conductivity.

A fuel cell system having a direct liquid fuel cell that uses a liquid containing a formic acid or an alcohol as a fuel includes: a fuel tank that stores the fuel to be supplied to the fuel cell; a fuel supply device that supplies the fuel in the fuel tank to the fuel cell; and a bubbling device that blows an inert gas into the fuel stored in the fuel tank.

A system is disclosed for providing inerting gas to a protected space, and also providing electrical power. The system includes an electrochemical cell comprising a cathode and an anode separated by a separator comprising a proton transfer medium. Inerting gas is produced at the cathode. A fuel source comprising methanol or formaldehyde or ethanol and a water source are each in controllable operative fluid communication with the anode. A controller is configured to alternatively operate the system in a first mode of operation where water is directed to the anode fluid flow path inlet and electric power is directed from a power source to the electrochemical cell, and in a second mode of operation in which the fuel is directed from the fuel source to the anode fluid flow path inlet and electric power is directed from the electrochemical cell to the power sink.

A bifunctional catalyst and a preparation method therefor are provided. The bifunctional catalyst is prepared by providing carbon matrix, adding 0.01-10 mol/L platinum containing solution, 0.01-10 mol/L palladium containing solution, 0.01-10 mol/L silver containing solution, and 0.01-15 mol/L sodium citrate trihydrate solution to the carbon matrix for reacting at 20° C. to 80° C. for 0.5 h to 24 h to obtain a mixed solution, and adding reducing agent to the mixed solution for reacting for 0.5 h to 30 h, and centrifuging and drying so as to obtain the bifunctional catalyst.

The present invention is directed to a rechargeable electrochemical device including a first electrode assembly and a second electrode assembly spaced-apart from the first electrode assembly, a membrane arranged between the first electrode assembly and the second electrode assembly, a first transport plate arranged on the first electrode assembly and a second transport plate arranged on the second electrode assembly, an electrolyte disposed in the first electrode assembly and the second electrode assembly, and a vapor-phase hydrogen carrier in the first transport plate arranged on the first electrode assembly or in the second transport plate arranged on the second electrode assembly; a method for using a rechargeable electrochemical device; and a method for making a rechargeable electrochemical device.

A direct isopropanol fuel cell adapted for use in ambient conditions and utilizing as fuel isopropanol and water preferably with isopropanol at relatively high concentrations representing 30% to 90% isopropanol.

The present invention relates to a direct alcohol fuel cell (DAFC) comprising an anode terminal electrically connected to an anode catalyst in fluid communication with a fuel supply; a cathode catalyst in fluid communication with a gaseous oxidant; an electrically conducting cathode plate having a collecting element with evaporation holes, a bendable segment and a terminal site, which collecting element is electrically connected to the cathode catalyst; and a housing containing the collecting element, and a proton exchange membrane (PEM) between the anode catalyst and the cathode catalyst

A direct isopropanol fuel cell adapted for use in ambient conditions and utilizing as fuel isopropanol and water preferably with isopropanol at relatively high concentrations representing 30% to 90% isopropanol.

Disclosed herein is a multi-layered composite thin film material formed from graphene quantum dots (GQDs) and metal nanocrystals in a layer-by-layer design, wherein the metal nanocrystals can be selected from the group consisting of Ru, Rh, Os, Ir, Pd, Au, Ag and Pt. In a preferred embodiment, the multi-layered composite thin film material is prepared via a facile, green, and easily accessible layer-by-layer (LbL) self-assembly strategy. In this strategy, positively charged GOQDs and negatively charged metal nanocrystals are alternately and uniformly integrated with each other in a “face-to-face” stacked fashion under substantial electrostatic attractive interaction, and then the obtained GOQDs/metal composite thin film is calcined into GQDs/metal composite thin film. The composite thin film material disclosed herein may be used to catalyse a wide range or reactions, including selective reduction of aromatic nitro compounds in water and electrocatalytic oxidation of methanol at ambient conditions.

Provided are a fuel cell and a fuel cell system capable of suppressing deterioration of the electrolyte membrane by iron-based foreign substances with a simple structure. The fuel cell includes: a MEGA and a nitrate compound, wherein the MEGA has an electrolyte membrane, an anode catalyst layer disposed on one surface of the electrolyte membrane, a cathode catalyst layer disposed on the other surface of the electrolyte membrane, an anode gas diffusion layer disposed on a surface of the anode catalyst layer which is opposite to a surface of the anode catalyst layer on the electrolyte membrane side, and a cathode gas diffusion layer disposed on a surface of the cathode catalyst layer which is opposite to a surface of the cathode catalyst layer on the electrolyte membrane side, and wherein the nitrate compound is disposed in the MEGA.