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Electrochemical cells, pioneered by Swedish chemist Jöns Jacob Berzelius, revolutionized the field of chemistry, enabling the decomposition of various chemical compounds. These cells use electrical energy to drive chemical reactions, breaking down substances into their constituent elements or rearranging their molecular structures. Through electrolysis, Berzelius unlocked the secrets of molecular composition and paved the way for numerous advancements in the understanding and manipulation of chemical compounds.