The electrochemical interactions of these different U(VI) complexes could vary greatly, which was evidenced by CV scans (Figure ). The conductivity of the aqueous media, which is correlated to the electrolyte concentration, may affect photoelectrochemical water treatment processes . To examine this aspect, PEC U extraction experiments were conducted at different electrolyte concentrations. The results show that the extraction rate did not vary significantly while the electrolyte (NaCl) concentration increased dramatically from 10 mM to 100 mM (Figure ). In typical (photo)electrochemical water treatment systems, the overall charge carriers transfer resistance mainly consists of two components, i.e., the solution/ohmic resistance due to the resistance of the ions transfer in the reaction solution, and the charge transfer barriers at the solution/electrode interfaces . The