Cadmium Sulfide Photocatalyzed Hydrogen Production from Aqueous Solutions of Sulfite

Cobaloxime coenzyme catalyzing artificial photosynthesis for hydrogen generation over CdS nanocrystals

“…[1][2][3][4][5][6][7] As light absorbers desirable for AP, semiconductors are more competitive and promising for their excellent photostability, broad spectral response, and long lifetime of excited states in photocatalysis for H2 generation, when compared with the organic or organometallic molecules. [8][9][10][11][12][13] Among these semiconductors developed for photocatalytic H2 production, CdS has captured intensive attentions, owing to the suitable bandgap and excellent solar light response property; [14,15] and thus extremely high photocatalytic activity for solar H2 generation has been achieved over CdS. [15,16] However, in these CdS photocatalytic systems, particulate noble metals (e.g., Pt, Pd, Au) as cocatalysts are indispensable to maintain the high activity and stability of CdS for H2 generation.…”

Photocatalytic Production of H2 on Nanocomposite Catalysts

“…In order to enhance the photocatalytic activity of CdS, efforts have been made to combine CdS with other semiconductors having different band energies (e.g., TiO 2 /CdS, ZnO/CdS, ZnS/CdS, , K 4 Nb 6 O 17 /CdS, or K 2 Ti 4 O 9 /CdS composites , ). An alternative approach to enhance the photoactivity of CdS is to couple CdS with mesoporous or macroreticular materials to form hybrid or composite photocatalysts. − In these cases, the photogenerated electrons in CdS are able to move freely into an attached semiconductor or a framework of porous molecules, while the photogenerated holes are trapped in CdS. Charge separation reduces the frequency of charge recombination and, thus, improves the net photocatalytic activity of CdS.…”