Abstract
AbstractBa5Nb4O15 nanofibers with tailored nanofiber diameters are prepared via electrospinning, and treated in ammonia gas to synthesize niobate oxynitride nanofibers. Most importantly, the nanofibers retain their fiber morphology during ammonolysis, and the nanofiber diameter of the converted fibers can be adjusted. Only a thorough characterization, including detailed Rietveld refinements, can reveal that the ammonolysis of Ba5Nb4O15 results not only in BaNbO2N, but also generates Ba2NbO3N as additional oxynitride phase. Such BaNbO2N–Ba2NbO3N composite nanofibers with adjusted nanofiber diameters are applied in photocatalytic water oxidation and hydrogen generation. After decoration with CoNbO4 or Pt cocatalyst, the materials show a diameter‐dependent photocatalytic activity, respectively, with an optimum nanofiber diameter. The presented synthesis demonstrates a novel sol–gel‐derived possibility for nanostructuring of oxynitrides, which can pave the way for new synthesis strategies of nanostructured complex oxynitrides.
Highlights
Ba5Nb4O15 nanofibers with tailored nanofiber diameters are prepared via electrospinning, and treated in ammonia gas to synthesize niobate oxynitride nanofibers
Other oxynitrides such as SrNbO2N with an absorption edge at 700 nm,[1] BaTaO2N at 660 nm,[4] LaTiO2N at 600 nm,[2] and CaTaO2N at 510 nm[3] show less pronounced visiblelight absorption. This makes BaNbO2N a very interesting semiconductor material in BaNbO2N, and generates Ba2NbO3N as additional oxynitride phase. Such BaNbO2N–Ba2NbO3N composite nanofibers with adjusted nanofiber diameters are applied in photocatalytic water oxidation and hydrogen generation
The thickest oxynitride nanofibers show the highest activity, likely due to structural or morphological differences as we reported before for diameter-adjusted Ba5Ta4O15 nanofibers.[21]
Summary
Ba5Nb4O15 nanofibers with tailored nanofiber diameters are prepared via electrospinning, and treated in ammonia gas to synthesize niobate oxynitride nanofibers. Other oxynitrides such as SrNbO2N with an absorption edge at 700 nm,[1] BaTaO2N at 660 nm,[4] LaTiO2N at 600 nm,[2] and CaTaO2N at 510 nm[3] show less pronounced visiblelight absorption. This makes BaNbO2N a very interesting semiconductor material in BaNbO2N, and generates Ba2NbO3N as additional oxynitride phase. Such BaNbO2N–Ba2NbO3N composite nanofibers with adjusted nanofiber diameters are applied in photocatalytic water oxidation and hydrogen generation. Introduction an oxide precursor, such as BaNbO3 or the layered perovskite Ba5Nb4O15 or an amorphous oxide precursor, which is subsequently nitrided.[7,9,10,11,12,13,14,18,19] Hojamberdiev
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