Metal-air battery based on Fe(II)/Fe(III) chemical oxidation and electrochemical reduction

Abstract

The invention discloses a metal-air battery based on Fe(II) / Fe(III) chemical oxidation and electrochemical reduction. The metal-air battery is composed of a negative electrolyte, a positive electrolyte, a negative electrode (anode) metal plate, an ion semipermeable membrane, a graphite electrode, a breather pipe and an air pump. The metal-air battery based on Fe(II) / Fe(III) chemical oxidation andelectrochemical reduction disclosed by the invention is relatively high in equilibrium potential of an electrochemical reduction reaction, the discharge voltage and the discharge current density are higher than those of a traditional catalyst type metal-air battery, and the problem that the speed of an oxygen electrochemical reduction reaction in the traditional air battery is low is solved. The electrolyte and the graphite electrode of the battery are extremely stable, the problems of poisoning, decomposition and catalytic efficiency reduction do not exist, and the preparation materials are cheap, easy to obtain, low in cost and environmentally friendly. The electrolyte and the electrode can be regenerated, the replacement is convenient and rapid, the use is safe, and good application prospect and use value are achieved.

Description

technical field [0001] The invention relates to the field of new energy, in particular to a metal-air battery based on Fe(II) / Fe(III) chemical oxidation and electrochemical reduction. Background technique [0002] Metal-air batteries use active metal as the negative electrode (anode) and oxygen as the chemical power source of the positive electrode (cathode). However, since the partial pressure of oxygen in the air only accounts for 21%, it must go through the steps of adsorption, diffusion, and liquid-phase electrochemical reduction. Only when it can be discharged, the diffusion path is long, and the oxygen electrochemical reduction reaction speed is slow, resulting in high overpotential of oxygen ionization and reduction reaction, which makes the traditional metal-air battery have low discharge voltage, small discharge current, and insufficient work ability. [0003] Therefore, the positive electrode of traditional metal-air batteries often uses noble metal catalysts such ...

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Problems solved by technology

However, the stability of noble metal catalysts is poor, the catalytic activity is difficult to maintain for a long time, and the cost is very high, making it difficult to apply on a large scale

In addition, metal oxide catalysts (such as oxides of variable metals such as Mn, Co, and Fe) can also be used as positive electrode materials, but the catalytic activity of metal oxide catalysts is not as good as that of noble metal catalysts, and it is easy to react with CO in the air. 2 Poisoning reaction leads to loss of activity, short lifespan and insufficient stability; at the same time, some metal oxide catalysts contain heavy metals, which pollute the environment, are complicated to prepare, and cost high

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