How did Sir Humphry Davy use voltaic cells in his chemical research?

Sir Humphry Davy utilized voltaic cells—early forms of electric batteries—as a powerful tool for electrolysis, the process of using electric currents to decompose chemical compounds into their constituent elements.123

Davy theorized that the production of electricity in these cells resulted from chemical action and that chemical combinations occurred between substances with opposite electrical charges. Based on this, he reasoned that electrolysis was the most effective method for isolating elements. By employing stronger batteries than those used by his predecessors, he successfully isolated several highly active metals from their liquid compounds, including sodium, potassium, calcium, strontium, barium, and magnesium.21

His pioneering work in this field, detailed in his 1806 lecture "On Some Chemical Agencies of Electricity," fundamentally advanced the science of electrochemistry and earned him the Copley Medal in 1805.23