The invention of the Daniell cell.

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The Daniell cell is a primary cell with a constant electromotive force of 1.1 volts. It usually consists of a copper electrode in a copper sulphate solution and a zinc electrode in dilute sulphuric acid or zinc sulphate; the solutions are separated by a porous partition or by gravity[1].


The English chemist and physicist John Frederic Daniell invented[2] the Daniell cell in 1836 after looking for a way to solve the problem of hydrogen bubbles forming on voltaic piles. He called it the “constant battery”. Here is an illustration of his original cell:

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Here is an oil painting[3] of John Frederic Daniell:

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