Fig. 25. (A) Schematic representation of the used SECM setup for the study of DMRc regeneration with two Pt microelectrodes placed near immiscible electrolyte solutions (ITIES), where the blue double arrow represents the connection to the syringe pump that controls the position of the liquid/liquid interface. Anaerobic conditions are supplied by Ar, (B) schematic representation of the reaction and (C) current of the tip measured at 0.20 V vs. RHE, above the bottom Pt electrode and polarized at −0.18 V (a) exposed to UV light, (b) in darkness and (c) in darkness without substrate polarization. The organic phase contained 5 mmol dm⁻³ DMRc and 5 mmol dm⁻³ bis(triphenylphosphoranylidene)ammonium tetrakis(pentafluorophenyl)borate (BATB). The solution in which the Pt tip was immersed contained 0.1 M HClO₄ and 5 mM lithium tetrakis(pentafluorophenyl)borate (LiTB). The distance between the microelectrodes was 50 μm and the tip lateral velocity was 50 μm s⁻¹ Reproduced from ref. 216 with permission from Elsevier © 2018.