Synthesis and visible-light-induced sacrificial photocatalytic water oxidation of quinary oxynitride BaNb_0.5Ta_0.5O_2N crystals

摘要

cqvip:Quinary oxynitride BaNb_(0.5)Ta_(0.5)O_2N crystals were fabricated through the partial nitridation and acidification of the KCl flux grown Ba_5Nb_2Ta_2O_(15)crystals.The parameters of both the solute concentrations and cooling rates are optimized for the KCl flux growth of the larger Ba_5Nb_2Ta_2O_(15)crystals with clearer crystal habits.Here,the optimal Ba_5Nb_2Ta_2O_(15)crystals mainly have a hexagonal plate-like shape.After the partial nitridation and acidification,the porous Ba Nb_(0.5)Ta_(0.5)O_2N crystals maintained the crystal shape of the oxide precursor and had a single-crystalline nature.For the Ba_5Nb_2Ta_2O_(15)crystals,the wavelength of the absorption edge was about 707 nm.Especially,the CoO_x-loaded Ba Nb_(0.5)Ta_(0.5)O_2N photocatalyst demonstrated the comparatively high amount of O_2gas(150.7μmol)during the 5 h visible-light-induced sacrificial water oxidation half-reaction,which might be achieved due to the high crystallinity and visible-light absorption property.