Edison Lalande element

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Sectional view of an Edison Lalande element

The Edison Lalande element is a historic design of an electrically non-rechargeable primary cell . It was developed by Thomas Alva Edison towards the end of the 19th century after preliminary work by Felix Lalande and Georges Chaperon . The original cell of Lalande and Chaperon consisted of an electrode made of zinc and powdered copper oxide and a liquid electrolyte made of potassium hydroxide dissolved in water . Edison improved the design by replacing the powdered copper oxide with pressed pieces made of copper oxide.

The cell voltage of the Edison-Lalande element is 0.75  V , which is a disadvantage compared to other contemporary galvanic elements such as the Gravity-Daniell element with higher cell voltages, but the internal resistance of the cell is lower and allows higher discharge currents.

Reaction equations

The oxidation occurring on the zinc anode during discharge is:

The following reduction takes place on the cathode made of copper oxide :

Individual evidence

  1. ^ Location Text and List of Documents - The Edison Papers . Edison.rutgers.edu. Retrieved June 12, 2013.
  2. ^ William Edward Ayrton , Thomas Mather : Practical Electricity . Cassell and Company, London 1911, p. 196-203 ( online ).

Web links