Early Electrochemistry

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Presentation transcript:

Early Electrochemistry Galvani, Davy, Volta, Faraday

Galvani (1737-1798) Luigi Galvani was the first person to generate an electric current effect in frog's legs using two different metals. “One day he noticed that some frogs' legs he'd hung from brass hooks in a row on his balustrade, pending his dinner, twitched whenever the breeze blew them against the ironwork.” Source: http://www.alchemical.org/em/handout10-luigigalvani.html He explained the electricity as being of animal origin.

Volta (1745-1827) Alessandro Volta did not agree with Galvani's explanation. Volta was stimulated to develop the first electric battery from two different metals separated by a conducting solution of salt. This first battery is known as the “Voltaic Pile”. The electrical unit, “volt” is named after Volta.

Davy(1778-1825) Sir Humphry Davy used electricity as a source of energy for some of his investigations involving chemicals. He decomposed water by electrolysis and was responsible for isolating many metals in a pure form, including the reactive metals sodium and potassium.

Faraday(1791-1867) Michael Faraday carried out quantitative research into electrochemistry. (Faraday's Constant - The charge on a mole of electrons: F = 96,454.56 C) (1C = 1 amp/s) He developed laws of electrolysis (and induction) He introduced terms such as anion and cation to explain what was happening in terms of particle theory. Faraday’s laws for electrolysis were: 1 . The quantity of a substance produced by electrolysis is proportional to the quantity of electricity used. 2. For a given quantity of electricity the quantity of substance produced is proportional to its weight. More about Faraday’s Laws

What is the impact? Scientist Outline of work Analysis (How each scientist used previous work to further understanding of e- reactions) Galvani Volta Davy Faraday Outline and analyse the impact of the work of Galvani, Volta, Davy and Faraday in understanding electron transfer reactions