A compound proton exchange film for self-humidity increase fuel battery and its making method

Abstract

The invention relates to a proton exchange membrane for a fuel cell, in particular to a combined self-humidifying proton exchange membrane for a self-humidifying fuel cell and a preparation method. The method comprises the steps of distributing loaded catalysts to organic solution of solid macromolecule electrolyte to form casting solution, then casting, coating, or tape casting are adopted to prepare the self-humidifying proton exchange membrane, or the casting solution is adopted with methods of casting, coating, or tape casting to be filled in a porous strengthening membrane to prepare theself-humidifying proton exchange membrane. The self-humidifying proton exchange membrane of the invention generates from non-electric short circuit in the whole membrane, and has the characteristics of good density, high proton conductivity, strong water retaining capacity, as well as low cost.

Description

technical field [0001] The invention relates to a proton exchange membrane for a fuel cell, in particular to a composite proton exchange membrane for a self-humidifying fuel cell and a synthesis method thereof. Background technique [0002] The use of fossil fuels has caused a large amount of pollutants to be discharged, leading to environmental pollution problems. The development of new clean energy has attracted great attention from governments and business circles around the world. Proton exchange membrane fuel cell (PEMFC) is a power generation device that directly converts chemical energy in fuel and oxidant into electrical energy through electrochemical reactions, and has the advantages of high energy conversion efficiency and environmental friendliness. Currently, fuel cell technology has entered the demonstration stage. However, there are many obstacles in the process of fuel cell commercialization: such as infrastructure architecture, hydrogen production and storag...

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Problems solved by technology

However, the Pt electroless plating method is complicated, the film forming cycle is long, and the addition of non-proton-conducting oxides in the composite film increases the internal resistance of the film, and the battery performance is poor. In addition, the addition of Pt is easy to produce electronic short circuits in the entire film.

[0011] In the literature (L.Wang, D.M.Xing, Y.H.Liun, J.Power Source, in press.), the silica-supported platinum catalyst was added to the Nafion / PTFE membrane as an additive to prepare a self-humidifying composite membrane. Silicon oxide is a non-electronic conductor, which avoids the phenomenon of electronic short circuit in the composite film, but at the same time, silicon dioxide is a non-proton conductor, and its addition increases the internal resistance of the film.

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