ChemSusChem: RESOLV PI, Prof. K. Tschulik, showed how aqueous electrolytes, aldehydes exist in three forms: The non-hydrated aldehyde, the diol, and the diolate. This studi highlights that all three species exhibit electroactivity. Hence, it is possible to formulate approaches for addressing the OH−-induced decomposition of aldehydes during the electrochemical oxidation of aldehydes.