Porous graphitic carbon nitride (P-g-CN) thin sheets were fabricated by a one-step calcination of a mixture of urea, melamine, and ammonia chloride at 550 °C. P-g-CN showed 48% higher photocatalytic H production from methanol aqueous solution than conventional urea-derived graphitic carbon nitride (g-CN) because the existence of numerous pores reduces the recombination rate of charge carriers. In order to further enhance the photocatalytic activity, TiO was uniformly deposited on P-g-CN by 60-300 cycles of atomic layer deposition (ALD) to form the TiO@P-g-CN composite. They exhibited much higher photocatalytic hydrogen production rates than both TiO and P-g-CN. Among all composites, the sample deposited with 180 ALD cycles of TiO showed the highest H production because of optimal diffusion length for electrons and holes. It also performed better than the sample of g-CN deposited with 180 cycles of TiO.
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| http://dx.doi.org/10.1039/c8ra05126g | DOI Listing |
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