Bonding agent and membrane electrode assembly including same

Abstract

The present invention provides a bonding agent used by a membrane electrode group. The bonding agent comprises a solvent system, a hyperbranched polymer and an organic polymer capable of conducting ions, wherein the branching degree of the hyperbranched polymer is bigger than 0.5, and the hyperbranched polymer and the organic polymer capable of conducting ions are dispersed in the solvent system.

Description

technical field [0001] The invention relates to a binding agent and a membrane electrode group comprising it, in particular to a binding agent capable of operating at high temperature and a membrane electrode group comprising it. Background technique [0002] A fuel cell (Fuel Cell, FC) is a power generation device that uses chemical energy to be directly converted into electrical energy. Compared with traditional power generation methods, fuel cells have low pollution, low noise, high energy density, and high energy conversion efficiency. The advantage is that it is a very future-looking clean energy, which can be applied in various fields such as portable electronic products, household power generation systems, transportation tools, military equipment, space industry, and large-scale power generation systems. The operating principle of the fuel cell varies slightly depending on its type. Taking the Proton Exchange Membrane fuel Cell (PEMFC) as an example, hydrogen undergoe...

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Problems solved by technology

[0005] The binder with Nafion as the main component is easy to swell and deform when encountering water-based solvents, which makes it difficult to control the coating accuracy; and in a higher temperature (>80°C) environment, Nafion will soften and even cause phase changes. Affects the performance of the overall transport mechanism

However, when operating at low temperature (<80°C), CO poisoning cannot be avoided, resulting in poor catalyst efficiency and shortened service life; in addition, there are still considerable difficulties in the design of the water management mechanism of the binder with Nafion as the main component. , when the current density is high, it is easy to cause the cathode to be flooded, and the oxygen cannot be normally conducted to the surface of the catalyst, resulting in the limit of proton conduction

In addition, when Nafion is operated at high temperature (above 100°C), due to its poor water retention coefficient, its proton conductivity is greatly reduced, and the problem of structural deterioration extends, making Nafion as the main component The application of the binder is limited to operations below 80°C

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