Proton exchange membrane fuel cells
Proton exchange membrane fuel cell (PEMFC) with high specific power, high energy conversion efficiency, low start, environmentally benign, it can be used as power source for a variety of vehicles, is also a fixed station, portable electronic products the ideal power supply, therefore, PEMFC has become a hot research around the world [1]. PEMFC by the membrane electrode assembly (MEA), flow field plate, conductive plate, and other accessories, including one membrane electrode assembly by a proton exchange membrane (PEM) and gas diffusion electrode (GDE) composition. PEMFC is a solid polymer electrolyte membrane (SP) also known as proton exchange membrane, now widely used perfluorinated sulfonic acid membrane (PFSAM), such as the Nafion series; PEMFC electrode is a porous gas diffusion electrode, in accordance with the reaction gas electrode in different transport mechanisms can be used in the electrode current PEMFC electrode hydrophobic and hydrophilic electrode is divided into two types. Hydrophobic electrode reaction gas is formed in the hydrophobic water-repellent agent network transmission, while the hydrophilic electrode reaction gas is first dissolved in water or Nafion, the further proliferation of delivery [2]. Usually, MEA from the proton exchange membrane and gas diffusion electrodes made hot pressing, which is the core part of PEMFC, directly determines the battery's working performance, its structural design and preparation process is the core technology of PEMFC research.
Different from the traditional electrode is hydrophobic, hydrophilic electrode catalyst layer does not contain hydrophobic agent, its preparation method is the direct catalyst and the formation of Nafion resin uniformly mixed slurry coating on the gas diffusion layer or membrane. At present, MEA is also based on preparation of most of the hydrophobic electrode, the catalyst efficiency is low [3]. Preparation of the MEA based on hydrophilic electrode is in the research phase [4 ¯ 10], but the catalyst can further improve efficiency, production cost can be further reduced, its performance can be better than the hydrophobic electrode, is expected to be widely used in PEMFC. We are prepared using hydrophilic electrode MEA, with constant current polarization and electrochemical impedance spectroscopy (EIS) electrochemical method of electrode structure and composition on the performance and to determine the optimum parameters of MEA performance.
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