Photoelectrochemcial measurements (potential vs current density plots), stability study, incident-to-current efficiency (IPCE) and electrochemically active surface area (ECSA) measurements. Handling: PEC measurements-plot applied potential (x-axis) against current density (y-axis) PEC stability-plot time (x-axis) against current density (y-axis) IPCE-plot wavelength (x-axis) against IPCE (y-axis) ECSA-plot potential (x-axis) against current density (y-axis)