A system and method for avoiding downtime corrosion of a metal-air fuel cell

Abstract

The invention discloses a system and a method for avoiding corrosion of a metal-air fuel cell during shutdown. The system comprises a battery chamber, wherein an air positive electrode and a metal negative electrode arranged in a spacing are arranged in the battery chamber. The battery chamber is provided with a first electrolyte inlet, a first protective solution inlet, a first electrolyte outletand a first protective solution outlet. An electrolyte storage device having a second electrolyte inlet and a second electrolyte outlet, the second electrolyte inlet being connected to the first electrolyte outlet and the second electrolyte outlet being connected to the first electrolyte inlet; A protective liquid storage device having a second protective liquid inlet and a second protective liquid outlet, the second protective liquid inlet being connected to the first protective liquid outlet and the second protective liquid outlet being connected to the first protective liquid inlet. The system avoids the self-corrosion of the metal negative electrode of the metal-air fuel cell in the down state, and can switch the operation and stopping states of the cell freely at the same time. The service life of metal-air fuel cell is significantly prolonged.

Description

technical field [0001] The invention belongs to the physical and chemical technical field of metal-air fuel cell parking management, in particular, the invention relates to a system and method for avoiding metal-air fuel cell shutdown corrosion. Background technique [0002] A metal-air fuel cell is an energy conversion device that converts the chemical energy of a metal (or alloy) and an oxidant itself into electrical energy through an electrochemical reaction, and the reaction is carried out in an electrolyte. When working, the metal at the negative electrode loses electrons and enters the electrolyte. The electrons pass through the external circuit to the air positive electrode. The oxygen in the air gets electrons on the air electrode and enters the electrolyte. The reaction product is generally a metal oxide. Electrolytes mainly include aqueous electrolytes, organic electrolytes, gel electrolytes and ionic liquids. The most commonly used is the aqueous electrolyte, whi...

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Problems solved by technology

[0005] In order to solve the problem of metal negative electrode shutdown corrosion in metal-air fuel cells, there is an existing method of adding organic or inorganic additives, such as acetate, glycine, L-serine, etc., to the aqueous electrolyte, and the additives are efficiently adsorbed on the surface of the electrode. , which improves the surface characteristics of the electrode in the shutdown state and greatly reduces the corrosion rate. At the same time, this technology is simple and easy to implement. However, under actual working conditions, the corrosion inhibitor greatly affects the reaction of the electrode surface, which greatly increases the corrosion rate. charge transfer impedance of the electrode

[0006] Existing, existing technologies to circumvent shutdown corrosion of metal-air fuel cells need to be further improved

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