Gas diffusion electrode employing nano MnO2 catalyst

Abstract

The invention discloses a gas diffusion electrode employing a nano MnO2 catalyst. The gas diffusion electrode comprises a current collector, and a water proof layer and a catalysis layer that are coated on two sides of the current collector. A catalyst employed by the catalysis layer is a carbon supported nano MnO2 catalyst, which is preferably to be a nano carbon tube supported nano MnO2 catalyst and / or an active carbon supported nano MnO2 catalyst. Compared with a prior art, the invention enables the catalyst of nano MnO2 to be fixed on active carbon and nano carbon tube with good conductivity, so as to overcome defects of the nano MnO2, such as weak conductivity and easily agglomerated and shed particles and enhance stability and catalysis performances of the carbon supported nano MnO2 catalyst. Meanwhile, addition of the carbon tube into the active carbon reduces contact resistors among the active carbon particles and between the active carbon particle and a binder, so as to enhance performances of the gas diffusion electrode of the invention.

Description

technical field [0001] The invention relates to the technical field of chemical power sources, in particular to a method using nanometer MnO 2 Catalyst gas diffusion electrode. Background technique [0002] Due to its high specific energy, high reliability, no pollution to the environment, and safe use, metal-air batteries have attracted increasing attention in recent years. However, as the positive electrode of the battery, the reaction process of the air electrode is complicated, the exchange current density is low, and oxygen reduction is difficult. The main obstacle of the whole battery reaction; therefore, improving the performance of the air electrode has been the top priority of related research. [0003] At present, the research on oxygen electrode catalysts mainly focuses on noble metal and alloy catalysts, transition metal composite oxides, and some transition metal macrocyclic compounds, and there are few studies on the structure and properties of oxygen electrod...

AI Technical Summary

Problems solved by technology

For the same type of catalyst, the smaller the particle size and the better the dispersion, the higher its catalytic activity and utilization rate. Therefore, with the development of nanotechnology, people began to use nano-MnO 2 As a catalyst, it has high catalytic activity. However, due to its poor electrical conductivity, it is easy to agglomerate due to the existence of nano-effects, and its own particles are small and easy to fall off from the catalytic layer, thus affecting the performance of the electrode.

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