A Hydrophilic/Hydrophobic Membrane Electrode Involving Ionic Liquids

Abstract

The invention belongs to the technical field of membrane electrode preparation, and specifically relates to a hydrophilic / hydrophobic membrane electrode of an ionic liquid, a hydrophilic / hydrophobic membrane electrode related to an ionic liquid, and the anode catalytic layer is composed of a hydrophilic proton-type ionic liquid and a catalyst The cathode catalytic layer is made of hydrophobic and oxophilic proton-type ionic liquids and catalysts. The self-humidifying membrane electrode made of ionic liquids with special physical and chemical properties as raw materials for catalytic layer preparation in the present invention effectively solves the problem of The problem of increasing charge transfer resistance caused by inorganic oxides as additives for preparing self-humidifying membrane electrodes is solved. Because the ionic liquid selected in the present invention has negligible volatility, this greatly improves the ion transport capacity and stability of the membrane electrodes. At the same time, the present invention allows the hydrophobic ionic liquid to be adsorbed into the pores of the catalyst under high vacuum conditions through the continuous vacuuming process, so that the ionic liquid can be evenly dispersed on each surface of the catalyst.

Description

technical field [0001] The invention belongs to the technical field of membrane electrode preparation, and in particular relates to a hydrophilic / hydrophobic membrane electrode related to ionic liquid. Background technique [0002] Membrane electrode, as a key component in the hydrogen-oxygen fuel cell stack, plays a decisive role in the performance of the fuel cell stack. The membrane electrode is composed of the cathode and anode catalytic layers and the proton exchange membrane. The catalytic layer and the proton exchange membrane are the key components of the membrane electrode. , the catalytic layer plays the role of accelerating the oxygen reduction reaction, and the proton exchange membrane plays the role of isolating electrons and transporting protons. As a proton-conducting perfluorosulfonic acid polymer, the proton exchange membrane is heavily dependent on its Therefore, it is necessary to humidify the reaction gas to maintain a good hydration state of the proton e...

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Problems solved by technology

[0003] At present, most self-humidifying membrane electrode preparation technologies use hydrophilic inorganic oxides mixed with catalysts as the anode catalytic layer of the proton exchange membrane, and the cathode side uses hydrophobic inorganic oxides or PTFE mixed with catalysts as the cathode catalytic layer of the proton exchange membrane. For example, patents with publication numbers CN104716351A, CN103078122A and CN1750301A use TiO 2 , SnO 2 or W 2 o 3 Inorganic oxides are used as hydrophilic materials, but the addition of these inorganic oxides brings another serious problem. Since inorganic oxides are non-conductive electrons and protons, the addition of inorganic oxides seriously affects the membrane electrode. The proton transport performance increases the charge transfer resistance and ohmic resistance, which affects the performance of the battery. At the same time, the addition of hydrophilic inorganic oxides to the proton exchange membrane also seriously affects the mechanical properties of the proton exchange membrane.

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