Graphitic Carbon Nitride/CdSe Quantum Dot/Iron Carbonyl Cluster Composite for Enhanced Photocatalytic Hydrogen Evolution

A g-C3N4/CdSe quantum dot/[Fe2S2(CO)6] composite has been successfully constructed. The structure and chemical composition of the were investigated via, inter alia, transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron (XPS). ability assembly to act as a photocatalyst for proton reduction form hydrogen gas was studied. With visible light irradiation 4 h, total H2 production catalyzed by found be 9 times high corresponding CdSe/[Fe2S2(CO)6] significantly higher than either CdSe dots or g-C3N4 alone. support/matrix enhance stability efficiency dot/iron carbonyl cluster in photocatalytic evolution process. Results from recycling tests showed that is sustainable robust photocatalyst, maintaining same activity after three cycles. photoinduced charge carrier transfer dynamics system transient absorption (TA) time-resolved photoluminescence (TRPL) spectroscopies. spectroscopic results indicate efficient hole valence band excited molecular iron clusters defect state composite, which inhibits recombination photogenerated carriers boosts evolution. Energy with time constant 0.7 ns also contributed