Fig. 5: PEC/EC switchable electrode.
From: Pt nanoclusters on GaN nanowires for solar-asssisted seawater hydrogen evolution
a Schematic of switchable dual contact electrode. The front contact is placed on the front side of GaN nanowires (NWs) and the back contact is placed on the back side of n+-p Si wafer. GaIn eutectic was sandwiched between the Cu contacts and the substrate for Ohmic connection. Illustrations of working principles of b front contact for electrochemical HER under dark and c back contact for photoelectrochemical HER under light. d LSV curves of electrode measured with 2-electrode configuration in 0.5 M NaCl solution. e Onset potential and current density at −2 and −3 V for front and back contacts. Onset potential was defined as the potential at −10 mA/cm2. f Amount of H2 produced and faradaic efficiency measured at −2 and 3 V under dark (front contact) and light (back contact) conditions.
