What is Leclanche Cell ?
This cell was constructed by Georges Leclanche in 1865. In this cell, anode is a carbon rod placed in a porous pot containing a mixture of powdered carbon and manganese dioxide. Manganese dioxide is an oxidizing agent and acts as depolarizer. The carbon powder is used to make the manganese dioxide conducting or to increase the surface area of the carbon electrode. An amalgamated zinc rod is used as negative electrode (cathode). The porous pot and the zinc rod are placed in a glass jar containing the solution of ammonium chloride (10 parts water and 1 part of ammonium chloride) which acts as an electrolyte. The mouth of the jar is painted black so that the ammonium chloride may not creep the walls of the glass jar.