Constructing ultralong hollow chain-ball-like carbon nitride implanted with oxygen for superior visible-light photocatalytic hydrogen production

摘要

Regulating morphology has recently become an effective approach to improve the photocatalytic activity of graphite carbon nitride, but its morphology types are still limited. Herein, ultralong hollow chain-ball-like carbon nitride implanted with oxygen (OCNT) was prepared through a facile supramolecular self-assembly route. The ultralong hollow chain-ball-like structure results in enhanced photoinduced charge carrier separation. In particular, the implantation of oxygen into the chemical backbone leads to the formation of a midgap state, which can more effectively capture visible light. The H-2 production rate (HPR) of OCNT is 5.47 mmol h(-1) g(-1), which is much higher than that of BCN by a factor of 14.0 under visible light irradiation. Moreover, BCN displays the very low HPR with values close to zero, while OCNT exhibits much superior efficiency (1.62 mmol h(-1) g(-1)) under long visible light illumination (lambda > 510 nm). The current research results may furnish fresh insights into the exploration of carbon nitride with different morphologies for high solar energy utilization.

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