Introduction

Electrochemical cells are devices used to convert chemical energy into electrical energy. Mainly, there are two types of electrochemical cells: Daniell cell and galvanic cell. Both cells are similar in terms of operation and structure, but there are small differences that must be known to better understand their operation and applications.

Daniell cell

The Daniell cell was invented by the British chemist and meteorologist John Frederic Daniell in 1836. This cell is made up of two electrodes, the cathode and the anode, immersed in an electrolyte solution. The cathode is copper and the anode is zinc. The electrolyte solution used is copper sulfate and zinc sulfate, and a salt bridge is used to connect the two electrodes. The chemical reaction that occurs in a Daniell cell can be represented as:

Zn(s) + CuSO₄ (ac) → ZnSO₄ (ac) + Cu (s)

The Daniell cell is a non-spontaneous electrochemical cell, which means that An external source of energy is required for the reaction to take place.

Daniell Cell Applications

• Daniell cells are used in dry cells, rechargeable batteries and constant current sources.
• They have been used as power sources in electronic devices, including cameras, watches, and other devices electronics that require low currents.
• In electroplating, the Daniell cell is used to coat objects with a metallic layer.

Galvanic cell

The galvanic cell is based on the same principle as the Daniell cell, but has some differences in its structure. The galvanic cell is made up of two electrodes, the cathode and the anode, immersed in an electrolyte solution. The cathode is the positive electrode, while the anode is the negative electrode. The electrolyte solution used is generally a salt or acid, and a salt bridge is used to connect the two electrodes.

Galvanic cell applications

• Galvanic cells are used in commercial batteries, alkaline batteries and automobiles.
• They are used as portable power sources for electronics and devices that require high current power, such as flashlights and radios.
• In electroplating, the galvanic cell is used to coat objects with a metallic layer.

Conclusions

In conclusion, there are some differences in the Daniell cell and the galvanic cell. The main difference is the way the electrodes are connected, and the type of electrolyte solution that is used. Although both cells have similar applications, it is important to understand their differences to apply them correctly in different situations.

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