Figure 2

Figure 2: The graph plots the steady-state current density at each applied potential. The ITO/Si/ITO electrode shows minimal activity compared to the Co-Pi loaded electrodes. Under illumination the ITO/Si/Co/Co-Pi electrode has significantly higher current densities than ITO/Si/ITO/Co-Pi, emphasizing that the judicious choice of materials and their sequencing on the photoanodic substrate are of critical importance.