Proton exchange membrane for medium-high temperature fuel cell and preparation method thereof

Abstract

The invention relates to a proton exchange membrane for a medium-high temperature fuel cell and a preparation method thereof. The proton exchange membrane for the medium-high temperature fuel cell is compounded by nitrogen heterocyclic compound grafted inorganic nanoparticles and perfluorosulfacid resin, and the preparation method comprises the following steps: synthesizing precursors of the nitrogen heterocyclic compound grafted inorganic nanoparticles; preparing mixed solution of the precursors of the nitrogen heterocyclic grafted inorganic nanoparticles and the perfluorosulfacid resin; performing in situ synthesis of the nitrogen heterocyclic grafted inorganic nanoparticles; and preparing a nitrogen heterocyclic grafted inorganic nanoparticles-perfluorosulfacid composite membrane, namely the proton exchange membrane for the medium-high temperature fuel cell. The proton exchange membrane can replace water to be used as a proton conduction medium at normal, medium or high temperature, the nitrogen heterocyclic functional group has the performance of partial flow in the membrane, and the proton exchange membrane can avoid the attenuation phenomenon of the cell performance due to the fact that the nitrogen heterocyclic compound runs off along with water generated by electrochemical reaction, and can avoid the generation of catalyst poisoning phenomenon caused when the nitrogen heterocyclic compound flows to the surface of an electro-catalyst.

Description

technical field [0001] The invention relates to a proton exchange membrane for a medium-high temperature fuel cell and a preparation method thereof. Background technique [0002] Proton Exchange Membrane Fuel Cells (PEMFCs) using hydrogen as fuel have great potential in the application of transportation power sources and stationary power stations due to their high energy conversion efficiency and no pollution. However, in order for PEMFCs to truly move towards industrialization, technical obstacles such as low heat dissipation efficiency, complex water and heat management, and poor environmental adaptability (C0 tolerance) must be overcome. [0003] Increasing the operating temperature of the fuel cell is one of the effective measures to solve the complex water heat management and catalyst poisoning; at the same time, it can also improve the kinetics of the oxygen reduction reaction at the anode and cathode of the battery, especially the cathode, thereby improving the workin...

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Problems solved by technology

However, because the nitrogen heterocyclic ring is tightly connected to the polymer skeleton, the local mobility (flexibility) of the nitrogen heterocyclic ring is greatly restricted, which in turn affects the proton conductivity of the formed film.

The proton conductivity of the proton exchange membrane formed by this type of compound reported in the literature is very low at 160 ° C and 33 RH%, only at 10 -6 On the order of S / cm, it is far from meeting the requirements of proton exchange membrane proton conductivity (>0.01S / cm) for the normal operation of fuel cells

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