Harvesting Solar Light with Crystalline Carbon Nitrides for Efficient Photocatalytic Hydrogen Evolution |
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Authors: | Dr. Manas K. Bhunia Dr. Kazuo Yamauchi Prof. Kazuhiro Takanabe |
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Affiliation: | 1. Division of Physical Sciences and Engineering, KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology (KAUST), 4700 KAUST, Thuwal, 23955‐6900 (Saudi Arabia);2. Imaging and Characterization Core Lab, King Abdullah University of Science and Technology (KAUST), 4700 KAUST, Thuwal, 23955‐6900 (Saudi Arabia) |
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Abstract: | Described herein is the photocatalytic hydrogen evolution using crystalline carbon nitrides (CNs) obtained by supramolecular aggregation followed by ionic melt polycondensation (IMP) using melamine and 2,4,6‐triaminopyrimidine as a dopant. The solid state NMR spectrum of 15N‐enriched CN confirms the triazine as a building unit. Controlling the amount and arrangements of dopants in the CN structure can dramatically enhance the photocatalytic performance for H2 evolution. The polytriazine imide (PTI) exhibits the apparent quantum efficiency (AQE) of 15 % at 400 nm. This method successfully enables a substantial amount of visible light to be harvested for H2 evolution, and provides a promising route for the rational design of a variety of highly active crystalline CN photocatalysts. |
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Keywords: | carbon nitride hydrogen evolution photocatalysis semiconductors solar‐energy conversion |
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