Practical carbon dioxide reduction film electrolyzer and preparation method thereof

Abstract

The invention discloses a practical carbon dioxide reduction film electrolyzer and a preparation method thereof, and belongs to the field of electrocatalytic carbon dioxide reduction. The film electrolyzer comprises a cathode flow field plate, a cathode gasket, a cathode diffusion layer, a membrane electrode, an anode diffusion layer, an anode gasket and an anode flow field plate which are assembled in sequence, wherein the membrane electrode comprises an SPE membrane, a cathode catalyst and an anode catalyst, the cathode catalyst and the anode catalyst are located on the two sides of the SPEmembrane respectively, the cathode flow field plate is smooth in a snake shape, and the anode flow field plate is a net-shaped flow field. The method is simple and safe to operate, the electrolyzer works efficiently and stably, the performance of the electrolyzer reaches a high level in the same field, for example, hundreds of milliamperes of current density can be achieved through a low cell voltage, the selectivity exceeds 90%, and the like, and the electrolyzer has novelty, practicability and wide prospects.

Description

technical field [0001] The invention belongs to the field of electrocatalytic carbon dioxide reduction, and relates to a practical tightly assembled carbon dioxide reduction membrane electrolysis device and a preparation method thereof. Background technique [0002] In recent years, the use of a large number of fossil fuels has led to an increase in the concentration of carbon dioxide in the atmosphere year by year, which has caused serious environmental problems such as the greenhouse effect. In addition, fossil fuels themselves are non-renewable energy and face the risk of resource depletion. Therefore, the field of low-carbon green energy and carbon dioxide conversion more and more people pay attention to. Among many conversion technologies, it is potentially feasible to use renewable energy such as solar / wind energy to generate clean electricity, and then use it to efficiently catalyze the reduction of carbon dioxide. However, most of the research is only carried out in ...

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Problems solved by technology

A thin-layer liquid flow electrolyzer designed with a neutral or alkaline medium combined with a gas diffusion electrode can achieve a current density of 100 milliamperes and reach a practical level, but there are other problems: neutral medium (Haas, T.et. al.Nat.Catal.2018,1,32-39.) works stably but has large internal resistance and low energy conversion rate; while alkaline medium (Verma,S.et al.ACS Energy Lett.2018,3,193-198. ) has high efficiency, but the reaction interface is easy to salt out and block the gas channels, and the consumed lye has to be replenished regularly, so it cannot work stably for a long time

[0004] In another type of tightly packed solid polymer electrolyte (SPE) membrane electrolyzer, the electrolyte layer is replaced by a thinner SPE membrane, but common acidic SPE membranes, such as DuPont's Nafion, are accompanied by severe hydrogen evolution side reactions that are difficult to However, the research on the corresponding alkaline SPE membrane has just started, and it cannot be applied alone without liquid electrolyte, and its performance cannot be compared with the similar results of thin-layer liquid flow electrolyzer.

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