Alcohol-rejection proton conducting composite film and preparation method thereof

Abstract

The invention discloses an alcohol-rejection proton conducting composite film and a preparation method thereof. The alcohol-rejection proton conductive composite film is characterized in that a grapheme layer is composited in parallel with polymer proton conducting films and is adhered to one sides of the polymer proton conducting films or clamped between the two polymer proton conducting films. The preparation method comprises the following steps of: attaching the grapheme layer to one sides of the polymer proton conducting films by developing copper-base chemical vapor deposition grapheme or rotatably spraying grapheme aqueous dispersion / oxidized grapheme water solution, and further clamping the grapheme layer between the two polymer proton conducting films by utilizing a hot-pressing process. According to the alcohol-rejection proton conducting composite film, the alcohol-rejection performance of the film can be remarkably improved on the premise that the electric conductivity of protons of a polymer proton conducting film body is not influenced; the alcohol-rejection proton conducting composite film can be obtained by utilizing diversified methods; the preparation process is simple, and most areas of the grapheme layer are single-layered, so that the resistance caused to the proton conduction in the film body is relatively low.

Description

Technical field [0001] The invention relates to the technical field of ion-conducting polymer membranes, in particular to a composite proton-conducting membrane in which a graphene layer (Graphene, G) is combined with a polymer electrolyte and a preparation method thereof. Background technique [0002] A fuel cell is a power generation device that directly converts the chemical energy of a substance into electrical energy. Compared with internal combustion engines, fuel cells are not restricted by the Carnot cycle, so the efficiency of material chemical energy utilization can reach a very high level. Compared with the battery, the fuel cell is a device for energy conversion rather than energy storage. As long as the fuel is continuously replenished, it can continue to generate electricity, which has the advantage of not requiring charging. In addition, fuel cells also have the characteristics of high energy density and high power density, and they produce less pollution than int...

AI Technical Summary

Problems solved by technology

Among the currently known polymer proton conducting membranes with thin film interlayers, the polymer proton conducting membranes using palladium foil as interlayers have the best effect on preventing fuel penetration, but in this case the resistance of protons passing through the palladium foil is very high , which is not conducive to the proton conduction of the membrane, and because palladium is a noble metal, and because the preparation process uses vacuum ion sputtering, the method is more complicated and the cost is higher, making it difficult to popularize and apply