Abstract
AbstractUnreacted amino groups (−NHx) existed in the bulk g‐C3N4 always act as charge trap sites which resulting in low photocatalytic activity. In this paper, the hydrogenated deficient g‐C3N4 (HDCN) was prepared by calcining bulk g‐C3N4 with NaBH4 under an inert atmosphere. It was found that −NHx groups were absolutely reduced into both nitrogen vacancies and the cyano groups (−C≡N groups) in the frameworks of g‐C3N4 after this surface hydrotreating. Therefore, the photo‐induced carrier recombination is suppressed dues to the disappeared −NHx groups. As a result, the HDCN sample displayed a higher photocatalytic H2 evolution activity than the bulk g‐C3N4.
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