What did William Nicholson discovered?

William Nicholson, an English chemist and inventor, is best known for his discovery of the electrolysis of water in 1800. He demonstrated that passing an electric current through water separates it into hydrogen and oxygen gases. This work laid the foundation for future studies in electrochemistry and contributed to the understanding of chemical reactions involving electricity. Additionally, he invented the first practical form of the battery, enhancing the use of electrical energy in various applications.