Microbial fuel cell air cathode easy to perform scale preparation and preparation method thereof

Abstract

The invention belongs to the electrode preparation of fuel cells and aims to provide a microbial fuel cell air cathode easy to perform scale preparation, and a preparation method thereof. The collector body material of the air cathode is a three-dimensional porous material foam nickel sheet; the two sides of the foam nickel are respectively coated with a diffusion layer and a catalyst layer, wherein the diffusion layer consists of an inner mixed carbon basic layer and an outer polytetrafluoroethylene layer; and the mixed carbon basic layer comprises nano-scale activated carbon, conductive carbon and polytetrafluoroethylene serving as an adhesive; and the catalyst layer comprises micron-scale activated carbon, conductive carbon, isopropanol and polytetrafluoroethylene serving as the adhesive. The three-dimensional collector body material adopted by the invention is the foam nickel which has lower price than that of a carbon cloth and a stainless steel mesh, so that the manufacture costof a cell is further reduced; a catalyst is uniformly distributed in a three-dimensional network of a collector body, so that the conductivity of the electrode catalyst layer and the performance of the electrode are improved; the electrode and the cell have high stability; and the cathode has a simple manufacturing process and is easy to enlarge.

Description

technical field [0001] The invention relates to the electrode preparation of a fuel cell, in particular to a metal-free catalyst-free air cathode for microbial fuel cells that is easy to be prepared in large scale and a preparation method thereof. Background technique [0002] A microbial fuel cell is a device that uses microorganisms to catalyze the oxidation of organic matter to generate electricity. It can be applied to the treatment of wastewater to realize the dual effects of recovering energy and simultaneously purifying the energy and environment of sewage. It is a new type of innovative technology with great application prospects. [0003] Although microbial fuel cells can be designed as dual-chamber and single-chamber reactor structures, the single-chamber air-cathode battery structure is more promising. Because the single-chamber air cathode battery removes the expensive proton exchange membrane, the battery manufacturing process is simplified and the manufacturi...

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Problems solved by technology

On the other hand, carbon cloth and stainless steel are roughly two-dimensional structures, which brings inconvenience to electrode manufacturing. On the one hand, the amount of catalyst coating is small, which may lead to poor performance stability.

On the other hand, the conductivity of the catalyst layer is low, which affects the electrode performance

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