Fig. 2: H2-evolution and Z-scheme OWS performance of SrTaO2N nanocrystal photocatalyst. | Nature Communications

Fig. 2: H2-evolution and Z-scheme OWS performance of SrTaO2N nanocrystal photocatalyst.

From: Sub-50 nm perovskite-type tantalum-based oxynitride single crystals with enhanced photoactivity for water splitting

Fig. 2

a Time courses of the photocatalytic H2-evolution reaction in aqueous methanol (13 vol%) solution over the Cr2O3/Pt (MWEG)/Ir (MWH2O)-modified SrTaO2N nanocrystals (solid circles) and over the Cr2O3/Pt (MWEG)/Ir (MWH2O)-modified large-sized SrTaO2N crystals (Supplementary Fig. 13) prepared from the Ta2O5/SrCO3/SrCl2 precursor (open squares). Error bars indicate the standard deviation of three measurements. b AQY as a function of the incident-light wavelength during visible-light-driven H2 production over Cr2O3/Pt (MWEG)/Ir (MWH2O)-modified SrTaO2N nanocrystals. The solid line indicates the UV–vis diffuse-reflectance spectrum of SrTaO2N. The above reactions were carried out under illumination from a Xe lamp (300 W, λ ≥ 420 nm) with or without various bandpass filters. c Time courses of gas evolution during photocatalytic Z-scheme OWS under simulated sunlight using Cr2O3/Pt (MWEG)/Ir (MWH2O)-modified SrTaO2N nanocrystals (solid circles) or large-sized SrTaO2N (precursor: Ta2O5/SrCO3/SrCl2, Supplementary Fig. 13) (open squares) as the HEP, Ir-CoFeOx/BiVO4 as the OEP, and [Fe(CN)6]3−/[Fe(CN)6]4− as a redox mediator. Conditions: HEP, 50 mg; Ir-CoFeOx/BiVO4, 100 mg; 150 mL of 25 mM phosphate buffer solution (pH = 6) containing K4[Fe(CN)6] (5 mM); light source, solar simulator (AM 1.5 G, 0.87 sun); irradiation area for solar simulator, 9.3 cm2; background pressure, 5 kPa.

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