International Journal of Hydrogen Energy, Vol.43, No.4, 2207-2211, 2018
Fabrication of CdS/beta-SiC/TiO2 tri-composites that exploit hole- and electron-transfer processes for photocatalytic hydrogen production under visible light
In this work, CdS/SiC/TiO2 tri-composite photocatalysts that exploit electron- and hole-transfer processes were fabricated using an easy two-step method in the liquid phase. The photocatalyst with a 1:1:1 M ratio of CdS/SiC/TiO2 exhibited a rate of hydrogen evolution from an aqueous solution of sodium sulfite and sodium sulfide under visible light of 137 mu mol h(-1) g(-1) which is 9.5 times that of pure CdS. beta-SiC can act as a sink for the photogenerated holes because the valence band level of beta-SiC is higher than the corresponding bands in CdS and TiO2. In addition, the level of the conduction band of TiO2 is lower than those of CdS and beta-SiC, so TiO2 can act as the acceptor of the photogenerated electrons. Our results demonstrate that hole transfer and absorption in the visible light region lead to an effective hydrogen-production scheme. (C) 2017 The Authors. Published by Elsevier Ltd on behalf of Hydrogen Energy Publications LLC.
Keywords:Photocatalysis;Visible-light;Hydrogen evolution;Tri-composite;Hetero-junction;Hole-transfer