摘要:
The present invention discloses nanowires for use in a fuel cell comprising a metal catalyst deposited on a surface of the nanowires. A membrane electrode assembly for a fuel cell is disclosed which generally comprises a proton exchange membrane, an anode electrode, and a cathode electrode, wherein at least one or more of the anode electrode and cathode electrode comprise an interconnected network of the catalyst supported nanowires. Methods are also disclosed for preparing a membrane electrode assembly and fuel cell based upon an interconnected network of nanowires.
摘要:
The invention is a method of reducing catalyst dissolution in the cathode of a membrane electrode assembly fuel cell, the method comprising the steps of: (a) preparing a membrane electrode assembly comprising an anode, a cathode and a polymer electrolyte membrane interposed between the anode and the cathode; (b) assembling a fuel cell using the membrane electrode assembly; (c) applying a fluid comprising an oxidant to the cathode of the_membrane electrode assembly; (d) applying a fluid comprising a fuel to the anode of the membrane electrode assembly; and (e) supplying a sufficient quantity of reducing agent to the cathode to maintain the average open-circuit voltage of the cathode at less than about 0.98 V.
摘要:
Disclosed is a method for removing a solvent (41) in an electrolyte membrane (24) as a constituent of a membrane-electrode assembly (12) used in a fuel cell. The membrane-electrode assembly is arranged in a water vapor, and the water vapor is introduced into the electrolyte membrane by being transmitted through diffusion layers (21, 27) respectively on positive/negative electrode sides. The solvent in the electrolyte membrane is removed by the thus-introduced water vapor. This removal of the solvent is performed at temperatures which are not higher than the decomposition temperature of the hydrocarbon solid polymer.
摘要:
A fuel cell according to the invention comprises a multilayer proton exchange membrane having high proton conductivity in the temperature range of 300-500° C. This is achieved by the use of very thin (
摘要翻译:根据本发明的燃料电池包括在300-500℃的温度范围内具有高质子传导性的多层质子交换膜。这通过在金属基底上使用非常薄(<1μm)的金属氧化物聚合物膜来实现 通过电解阳极氧化金属合金。 根据本发明的示例性质子交换膜包括在铌箔上制造的Ta 2-x H z O x O 5 O 5膜。 本发明允许功率密度显着增加,并因此显着降低每单位功率的燃料电池成本。
摘要:
A method for preparing a membrane to be assembled in a membrane, electrode assembly includes the step of swelling an ion-conducting membrane in a liquid containing at least one solvent or to an atmosphere containing the vapor phase of at least one solvent by controlling the content of the solvent in the ion-conducting membrane. A method for manufacturing a membrane electrode assembly using an ion conducting membrane includes the steps of: providing an ion-conducting membrane in a pre-swollen state; coating the ion-conducting membrane on both sides with an electrode layer to form a sandwich; and hot-pressing the sandwich to form an ion-conducting bonding of the layers of the sandwich. Furthermore, a membrane electrode assembly is disclosed including a hot pressed sandwich having an electrode layer, a ion-conducting membrane and again an electrode layer, thereby using the ion-conducting membrane in its pre-swollen status prior to the hot-pressing.
摘要:
The present invention provides microfibrous direct methanol fuel cells that comprise microfibrous hollow membrane separators with fiber-reinforces ion exchange polymeric membrane walls. Specifically, the fiber-reinforces ion exchange polymeric membrane wall of each microfibrous direct methanol fuel cell comprises one or more continuous fibers, which extend along directions that are substantially parallel to a longitudinal axis of the microfibrous fuel cell. The present invention also provides microfibrous direct methanol fuel cells that each comprise a first and second microfibrous hollow membranes, wherein the first microfibrous hollow membrane comprises an ion-exchange polymer and defines a bore side and a shell side for separating an anode from a cathode, and the second microfibrous hollow membrane is disposed at either the bore side or the shell side of the first microfibrous hollow membrane for providing controlled delivery of a methanol-containing fuel fluid.
摘要:
A method and Apparatus for measuring water of hydration in a polyelectrolyte membrane (PEM) employs a source of input radiation directed at an input location on the PEM, and a detector responsively positioned at an output location relative to the input location for determining a sensible change in the input radiation indicative of a level of water hydration in the PEM. The method measures hydration of the (PEM) by forming an input location in the PEM; launching a source of radiation into the input location for reaction with the PEM material; detecting the reaction of the input radiation with the PEM material; and determining a sensible change in the input radiation as a result of the reaction indicative of a level of water hydration in the PEM.
摘要:
The composition described comprises 30 to 99.5% by weight of a sulfonated aromatic polyether ketone which has an ion-exchange capacity of from 1.3 to 4.0 meq (nullSO3H)/g of polymer, and from 0.5 to 70% by weight of a polybenzimidazole. This composition can, as can a sulfonated polyether ketone of PEK type, be processed to give membranes, preferably used in fuel cells.
摘要:
The present invention relates to a sulfonated polymer membrane and to a process for the preparation thereof. According to the process, a polymer film is irradiated, and the irradiated polymer film is sulfonated in order to link sulfonic acid groups thereto. According to the invention, the sulfonation is continued until the total concentration of sulfonic acid groups in the membrane is 0.4-3.0 meq/g and they are homogeneously distributed in the membrane material in such a manner that their concentration in the middle of the membrane is at minimum 0.2 meq/g. With the help of the invention, it is possible by a rapid and simple process to prepare membranes the chemical and mechanical properties of which can be regulated by means of the selection of the initial film, by irradiation and by the sulfonation process.
摘要:
A method and apparatus for handling thin films, for example, for handling and assembling membranes in fuel cell electrodes. The apparatus includes a translatable vacuum table for mounting the thin film, a perforated drum having a source of vacuum for removing the thin film from the vacuum table, and a transfer assembly having a perforated surface and a source of vacuum for transferring the thin film from the perforated drum to a target location. When the thin films are provided in containers, the apparatus may also include means for opening the containers to access the thin film within. Removal of the thin film from the transfer assembly may be aided by a thin film release device, for example, a plurality of moveable wires. The apparatus may be automated, for example, the apparatus may included automated controllers and robotic arms to facilitate the handling of thin film materials.