Whose suggestions largely supplied Faraday's electrolysis terms such as anode and ion?

William Whewell largely supplied Faraday’s electrolysis terms, including anode and ion. In 1834, Faraday needed clearer names for the electrodes and the substances moving through an electrolyte, so he consulted Whewell, a mathematician, philosopher, and historian of science.

Whewell proposed anode and cathode for the electrodes, drawing on Greek roots associated with going upward and downward. He also suggested anion and cation for the two kinds of migrating particles, with ion as the general term. Faraday adopted these suggestions in his published work on electrochemical decomposition.

The terminology helped distinguish the physical setup from the older language of battery “poles.” In modern electrochemistry, anions move toward the anode and cations toward the cathode, although electrode polarity depends on whether the cell is operating as a galvanic cell or an electrolytic cell.

A common mix-up is to credit Faraday alone with inventing every term. Faraday developed the experiments and introduced the vocabulary into electrochemical science, but Whewell’s linguistic suggestions were central to the final wording.