Investigation on nitridation processes of Sr2Nb2O7 and SrNbO3 to SrNbO2N for photoelectrochemical water splitting. Issue 1 (December 2018) - Kodera, Masanori
Abstract The processes involved in the nitridation of Sr2 Nb2 O7 and SrNbO3 to SrNbO2 N were assessed by varying the nitridation time, and the related effects on the physical and photoelectrochemical properties of the nitrided products were investigated. In the case of the layered perovskite-type oxide Sr2 Nb2 O7, the introduction of nitrogen and the extraction of oxygen took place concurrently, leading to lattice shrinkage and a porous structure. In contrast, during nitridation of the perovskite-type oxide SrNbO3, nitrogen was initially introduced without any loss of oxygen, which caused phase separation as a result of a lattice expansion and a charge compensation. The photoelectrochemical properties of obtained SrNbO2 N under simulated sunlight were found to vary with the oxide precursor used and with the nitridation process.