Abstract:
A fuel cell membrane electrode assembly is provided comprising a polymer electrolyte membrane comprising a first polymer electrolyte and at least one manganese compound; and one or more electrode layers comprising a catalyst and at least one cerium compound. The membrane electrode assembly demonstrates an unexpected combination of durability and performance.
Abstract:
Described herein is a polymeric electrolyte membrane for a redox flow battery comprising (i) a polymer, (ii) a plurality of pendent groups comprising a sulfonic acid, and (iii) a plurality of pendent groups comprising a sulfonamide.
Abstract:
The copolymer includes divalent units represented by formula -[CF 2 -CF 2 ]-, divalent units represented by formula:, and one or more divalent units independently represented by formula: The copolymer has an -SO 2 X equivalent weight in a range from 300 to 2000. A polymer electrolyte membrane that includes the copolymer and a membrane electrode assembly that includes such a polymer electrolyte membrane are also provided.
Abstract:
A catalyst ink is provided comprising: a) solids, comprising: i) a catalyst material, and ii) a polymer electrolyte; b) an aqueous solvent; and c) a coalescing solvent. In some embodiments, the coalescing solvent is selected from the group consisting of alkanes, alkenes, amines, ethers, and aromatic compounds which may optionally be substituted. In some embodiments, the coalescing solvent is selected from the group consisting of partially fluorinated alkanes, partially fluorinated tertiary amines, fully fluorinated alkanes and fully fluorinated tertiary amines. In another aspect, the present disclosure provides a fuel cell membrane electrode assembly comprising a catalyst layer comprising a coalescing solvent. In another aspect, the present disclosure provides a method of making a fuel cell membrane electrode assembly comprising a step of applying a catalyst ink according to the present disclosure to one or more of: a) a polymer electrolyte membrane, and b) a porous, electrically conductive gas diffusion layer.
Abstract:
The fluoropolymer dispersion includes a copolymer having divalent units represented by formula -[CF 2 -CF 2 ]-, divalent units represented by formula: [Formula should be inserted here], and one or more divalent units independently represented by formula: [Formula should be inserted here] dispersed in at least one of water or organic solvent. Methods of making the fluoropolymer dispersion and methods of using the fluoropolymer to make a at least one of a catalyst ink or polymer electrolyte membrane are also provided.
Abstract:
The description includes materials that may be useful for fuel cell applications such as in the manufacture of fuel cell electrodes, proton exchange membranes (PEM), as catalyst additives or in tie layers designed to be thermally and chemically robust while operating within a fuel cell's harsh environment at higher temperatures and to conduct protons, with significantly higher levels of bound acidic groups, while in a low hydration state. Methods of making the materials are also described.
Abstract:
A method is provided for making a crosslinked polymer electrolyte, typically in the form of a membrane for use as a polymer electrolyte membrane in an electrolytic cell such as a fuel cell, by trimerization of nitrile groups contained on groups pendant from the polymer. The resulting polymer electrolyte membrane comprises a highly fluorinated polymer comprising: a perfluorinated backbone, first pendent groups which comprise sulfonic acid groups, and crosslinks comprising trivalent groups according to the formula I The first pendent groups are typically according to the formula: -R 1 -SO 3 H, where R 1 is a branched or unbranched perfluoroalkyl or perfluoroether group comprising 1-15 carbon atoms and 0-4 oxygen atoms, most typically -O-CF 2 -CF 2 -CF 2 -CF 2 -SO 3 H or O-CF 2 -CF(CF 3 )-O-CF 2 -CF 2 SO 3 H.
Abstract translation:提供了一种制备交联聚合物电解质的方法,通常是通过聚合物悬浮在基团上的腈基的三聚作用将聚合物电解质通常用作电解池如燃料电池中的聚合物电解质膜。 所得的聚合物电解质膜包括高度氟化的聚合物,其包含:全氟化骨架,包含磺酸基团的第一侧基和包含根据式I的三价基团的交联。第一侧基通常根据下式:-R 1 > -SO 3 H,其中R 1是包含1-15个碳原子和0-4个氧原子的支链或非支链全氟烷基或全氟醚基团,最典型的是-O-CF2-CF2-CF2-CF2-SO3H或O-CF2- CF(CF 3)-O-CF 2 -CF 2 SO 3 H.
Abstract:
Described herein is a process for the reduction of carbon dioxide comprising: providing an electrochemical device comprising an anode, a cathode, and a polymeric anion exchange membrane therebetween, wherein the polymeric anion exchange membrane comprises an anion exchange polymer, wherein the anion exchange polymer comprises at least one positively charged group selected from a guanidinium, a guanidinium derivative, an N-alkyl conjugated heterocyclic cation, or combinations thereof; introducing a composition comprising carbon dioxide to the cathode; and applying electrical energy to the electrochemical device to effect electrochemical reduction of the carbon dioxide.
Abstract:
A fuel cell electrode layer may include a catalyst, an electronic conductor, and an ionic conductor. Within the electrode layer are a plurality of electronic conductor rich networks and a plurality of ionic conductor rich networks that are interspersed with the electronic conductor rich networks. A volume ratio of the ionic conductor to the electronic conductor is greater in the ionic conductor rich networks than in the electronic conductor rich networks. During operation of a fuel cell that includes the electrode layer, conduction of electrons occurs predominantly within the electronic conductor rich networks and conduction of ions occurs predominantly within the ionic conductor rich networks.
Abstract:
An electrolyte membrane having a proton conducting polymer reinforced with a nanofiber mat made from a nanofiber comprising a fiber material selected from polymers and polymer blends; wherein the fiber material has a fiber material proton conductivity; wherein the proton conducting polymer has a proton conducting polymer conductivity; and wherein the fiber material proton conductivity is less than the proton conducting polymer conductivity, and methods of making. In some embodiments, the nanofiber further comprises a proton conducting polymer.