Fig. 2: Photoelectrochemical seawater hydrogen evolution.
From: Pt nanoclusters on GaN nanowires for solar-asssisted seawater hydrogen evolution
a LSV curves of Si, Pt/Si, GaN/Si, and Pt/GaN/Si measured with 3-electrode configuration in 0.5 M NaCl solution under AM 1.5 G 1 sun illumination or in dark. b LSV curves of Pt/GaN/Si in six different aqueous solutions. Acidic solutions (pH = 0): 0.5 M H2SO4 and 0.5 M NaCl + 0.5 M H2SO4; Neutral solutions (pH = 7.4): 1 M PBS and 0.5 M NaCl + 1 M PBS; Weak alkaline solution: 0.5 M NaCl (pH = 9.1) and seawater (pH = 8.2). c ABPE of Pt/GaN/Si in seawater, 0.5 M NaCl, and 0.5 M NaCl + 1 M PBS. d LSV curves of Si, Pt/Si, GaN/Si, and Pt/GaN/Si measured with 2-electrode configuration in 0.5 M NaCl. Inset shows the onset potential of each electrode. e Amount of H2 produced and faradaic efficiency of Pt/GaN/Si in 0.5 M NaCl at −3 V vs IrOx. The faradaic efficiency is nearly 100%. f Stability of Pt/GaN/Si in 0.5 M NaCl and seawater at −3 V. The photocurrent density retains >85% of initial value after 15 h reaction. Inset shows the LSV curves before and after the stability test.
