Studies On Ordered Membrane Electrode Of Proton Exchange Membrane Fuel Cell

In order to improve the performance of proton exchange membrane fuel cells and prolong the service life of batteriies, some problems confronted are urgently figured out. The commercialization and industrialization of fuel cells also rise higher challenges on the solution of technology, seeking imperative methods both in economy and technology science processing. The structure and composition of a proton exchange membrane electrode are the kye parts for fuel cells, which has direct important influences over the performance of a battery. Generally catalyst particles are small and specific surface are huge, which is easily affected by the working conditions. Because of the flow of water and running hours, the carbon carriers are electrochemically oxidized and platinum nanoparticles aggregate and grow bigger, which results in the inactivation of the catalyst and greatly shortens the durability of the catalyst. make the structure of catalyst, the lack of adequate durability. Hindered the industrialization of fuel cell technology. So in order to solve the above problems, this paper was designed to set up an oredered structure for membrane electrodes and limit the arreagation of Pt particles on purpose and finally reach a longer durability and better performance.Ordered-structure Nafion mambrane with Pt loadings and Carbon-paper with ordered Pt nano wires were synthesised in the study. Firstlyt, vacuum sputtering method was applied. Sintered porous nickel was used as the template for ordered structures. A self-made glass device was designed and set up, which resulted in pressure difference exists between the two sides of a Nafion membrane and consequently ordered structure was constructed. By chemical deposition method, Pt was loaded on the ordered Nafion membrane with a U glass reaction reactor (A patent of the lab, application number is201210411453.4). Finally, nano Pt wires were prepared directly on carbon paper with the help of the dispersant of polyvinyl pyrrolidone(PVP) and self-reduction.Membrane electrode morphology and the membrane electrode surface composition were characterized by SEM (Scanning electron microscope) incoperated with EDS energy disperson spectra) and Inductively Coupled Plasma emission spectrometer (1CP). The crystal structure was analyzed by XRD (X-ray diffraction). Electrochemical work-station and three-electrodes tests were also carried out to measure the electrochemical performances of the membrane electrode. The characterizations above demonstrate that both ordered membrane electrodes with Pt loadings and Carbon paper electrodes with ordered Pt nano wires show better conductivity and good catalytic activity. It is worthwhile to do further research on setting up of the order on the membrane electrodes and its promotion mechanisms.