Visible Photocatalytic Hydrogen Evolution by g-C 3 N 4 /SrZrO 3 Heterostructure Material.

A heterostructure material g-CN/SrZrO was simply prepared by grinding and heating the mixture of SrZrO and g-CN. The morphology and structure of the synthesized photocatalysts were determined by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), energy-dispersive X-ray spectroscopy (EDS), high-resolution transmission electron microscopy (HRTEM) and infrared spectra. It showed visible light absorption ability and much higher photocatalytic activity than that of pristine g-CN or SrZrO. Under the optimal reaction conditions, the hydrogen production efficiency is 1222 μmol·g·h and 34 μmol·g·h under ultraviolet light irradiation and visible light irradiation, respectively. It is attributed to the higher separation efficiency of photogenerated electrons and holes between the cooperation of g-CN and SrZrO, which is demonstrated by photocurrent measurements.