Alessandro Giuseppe
Antonio Anastasio Gerolamo Umberto Volta (18 February 1745 – 5 March 1827) was an Italian physicist known for the invention of the battery in the 1800s.
First battery
In announcing his
discovery of the pile, Volta paid tribute to the influences of William Nicholson, Tiberius Cavallo and Abraham Bennet.
Voltaic pile
The battery made by
Volta is credited as the first electrochemical cell. It consists of two
electrodes: one made of zinc,
the other of copper.
The electrolyte is sulfuric acid or
a brine mixture of carbon and water. The electrolyte exists in the form 2H+ and
SO42−. The zinc, which is higher than both copper and hydrogen in the electrochemical series,
reacts with the negatively charged sulfate (SO42−). The positively charged
hydrogen ions (protons)
capture electrons from
the copper, forming bubbles of hydrogen gas, H2. This makes the zinc rod the
negative electrode and the copper rod the positive electrode.
We now have two
terminals, and the current will flow if we connect them. The reactions in this
cell are as follows:
zinc
Zn → Zn2+ +
2e−
sulfuric acid
2H+ + 2e− → H2
The copper does not
react, functioning as an electrode for the chemical reaction.
However, this cell
also has some disadvantages. It is unsafe to handle, as sulfuric acid, even if
dilute, is dangerous. Also, the power of the cell diminishes over time because
the hydrogen gas is not released, accumulating instead on the surface of the
zinc electrode and forming a barrier between the metal and the electrolyte
solution.
Last years and
retirement
In honor of his work,
Volta was made a count by Napoleon in 1801.Furthermore, he was
depicted upon the Italian 10,000 Lire (no longer in circulation) along with a sketch of his famous
Voltaic Pile.
Volta retired in 1819
to his estate in Camnago, a frazione of Como now called
Camnago Volta after him, where he died on 5 March 1827.He is buried in
Camnago Volta.
Volta's legacy is
celebrated by a Temple located in the public
gardens by the lake. There is also a museum which has been built in his honor
and exhibits some of the original equipment he used to conduct experiments; not
far away stands the Villa Olmo, which houses the Voltian
Foundation, an organization promoting scientific activities. Volta carried out
his experimental studies and made his first inventions in Como.
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