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碱性电解质燃料电池

2018-4-22 08:43| 发布者: dymodel| 查看: 157| 评论: 0|原作者: baby

摘要: 电解液中的“碱性燃料电池”通常是氢氧化钾解决方案。 The electrolyte in an alkali fuel cell is usually KOH (potassium hydroxide) solution. The important feature of an alkali is that there is an exc ...
电解液中的“碱性燃料电池”通常是氢氧化钾解决方案。


The electrolyte in an "alkali fuel cell" is usually KOH (potassium hydroxide) solution. The important feature of an alkali is that there is an excess of OH- ions, and these play a key role in the reactions inside the cell.
In order to understand how an electric current is produced, it is necessary to consider the reactions that take place at each electrode.
At the anode, hydrogen gas reacts with the OH- ions, producing water, and releasing electrons. The reaction is:-
EQU3.GIF
The electrons go round the electrical circuit attached to the fuel cell, and reach the cathode. Here they react with the oxygen, and water, producing more OH- ions to replenish those used at the anode.
碱性电解质燃料电池离子反应方程式2

The OH- ions move through the electrolyte, and the electrons move round the circuit. The complementary movement of ions and electrons is shown in the diagram below.
碱性电解质燃料电池离子反应方程式1
Note two important points:-
1) Water is produced at the anode twice as fast as it is used up at the cathode. (In the solid polymer cell water is made at the cathode.)
2) The cathode is the electricaly positive terminal, the one that the electrons flow towards. Some people find this confusing, since they are quite wrongly taught that the cathode is the negative terminal for everything. It is not! The cathode is also the correct name for the positive terminal of any primary cell. (See the Oxford English Dictionary!)

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