Hydrogen Production and Characterization of MLaSrNb2NiO9 (M = Na, Cs, H) Based Photocatalysts
Abbreviated Journal Title
VISIBLE-LIGHT IRRADIATION; PEROVSKITE STRUCTURE; TANTALATE; PHOTOCATALYSTS; WATER; O-2; H-2; DECOMPOSITION; NICKEL; OXIDES; RAMAN; Chemistry, Physical; Materials Science, Multidisciplinary
Novel photocatalysts MLaSrNb2NiO9 (M = Na, Cs, H) were prepared for H-2 evolution from an aqueous methanol solution under both UV and visible light (> 420 nm) irradiation. CsLaSrNb2NiO9 (CNO) with a 2D layered structure (similar to that of CsCa2Nb3O10) shows a much higher activity than the NaLaSrNb2NiO9 (NNO) photocatalyst that consists of a 3D cubic perovskite crystal structure (ABO(3)). Experimental results show that Cs ions in CNO can be replaced by protons using a 1.0 M HNO3 solution, forming a new photocatalyst, HLaSrNb2NiO9 (HNO), whereas Na+ in NNO cannot be exchanged by H+ under the same conditions. Results show that partially exchanging Cs ions with protons significantly improves the photocatalytic activity of CNO-based photocatalyst. It is found that the higher activities of CNO and HNO compared with that of NNO are attributed to larger surface areas and the 2D layered structure.
Chemistry of Materials
"Hydrogen Production and Characterization of MLaSrNb2NiO9 (M = Na, Cs, H) Based Photocatalysts" (2010). Faculty Bibliography 2010s. 984.