We all have seen these batteries atleast once in our lifetimes. so we'll discuss some science behind these batteries ( these batteries are known as alkaline batteries ). Alkaline batteries are the most manufactured batteries.
Anything with a Ph level over 7 is called alkaline. So these batteries get their name from the Potassium Hydroxide electrolyte present inside. This is how Potassium Hydroxide looks like. Electrolyte of Potassium Hydroxide is present in Alkaline battery.
Basic chemistry inside the battery :
Electrodes are something through which electricity enters or leaves.
there are two electrodes : Positive electrode - manganese (IV) oxide
Negative electrode - Zinc
Zinc :
Manganese Dioxide :
Detailed image showing which is where :
You may wonder about the voltage. voltage in a battery is genereted by chemical reactions inside the battery.
We'll discuss more concepts relating to batteries and energy storage in future posts......
Basic chemistry inside the battery :
Electrodes are something through which electricity enters or leaves.
there are two electrodes : Positive electrode - manganese (IV) oxide
Negative electrode - Zinc
Zinc :
Manganese Dioxide :
Detailed image showing which is where :
The half-reactions are:
- Zn(s) + 2OH−(aq) → ZnO(s) + H2O(l) + 2e− [e° = -1.28 V]
- 2MnO2(s) + H2O(l) + 2e− → Mn2O3(s) + 2OH−(aq) [e° = +0.15 V]
Overall reaction:
- Zn(s) + 2MnO2(s) ⇌ ZnO(s) + Mn2O3(s) [e° = +1.43 V]
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