Investigation on nitridation processes of Sr2Nb2O7 and SrNbO3 to SrNbO2N for photoelectrochemical water splitting. Issue 1 (December 2018)

• Record Type: Journal Article
• Authors: Kodera, Masanori; Moriya, Yosuke; Katayama, Masao; Hisatomi, Takashi; Minegishi, Tsutomu; Domen, Kazunari
• Is Part Of: Scientific reports. Volume 8:Issue 1(2018)
• Page Start: 1
• Page End: 10
• Publication Date: 2018-12
• Subjects: Natural history -- Research -- Periodicals; Biology -- Research -- Periodicals; Physical sciences -- Research -- Periodicals; Earth sciences -- Research -- Periodicals; Environmental sciences -- Research -- Periodicals; 502.85
• DOI: 10.1038/s41598-018-34184-2
• Languages: English
• ISSNs: 2045-2322

Abstract

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.