Abstract
g-C3N4, a metal-free polymer material is widely used as a photocatalyst because of its visible light bandgap, easy preparation from abundant precursors, and excellent chemical and thermal stability. Herein, NiO/g-C3N4 photocatalysts were prepared using calcination and wet impregnation approaches. X-ray diffraction studies revealed the formation of NiO/g-C3N4 photocatalysts. The p-n junction formation at the interface resulted in redshift in the bandgap of the photocatalysts and further enhancement in visible light absorption as evident from UV–vis diffuse reflectance spectroscopy. The NiO/g-C3N4 produced an average hydrogen evolution rate of 766 μmol/h/g in an aqueous-methanol solution. Compared to bare NiO (6 μmol/h/g) and g-C3N4 (7 μmol/h/g), the NiO/g-C3N4 photocatalysts produced 127 and 109 times higher hydrogen, respectively.
Published Version
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