The EQY measurements were carried out using a simulated solar light (LOT LSN 254) equipped with a monochromator (LOT MSH 300). The samples were irradiated with a wavelength of λ = 360 nm (for TiO2|Pt) and λ = 400 nm (for CNx|Ni2P). The light intensities were determined before and after each measurement and the irradiation area was kept fixed at 1 cm 2 . The EQY for the samples were determined using the following equation (1):