研究目的
To investigate the performance of La5Ti2CuxAg1-xS5O7-based photocatalysts for Z-scheme overall water splitting in a powder suspension system, specifically identifying La5Ti2AgS5O7 as the most effective and understanding the differences in optimization strategies compared to particulate sheet systems.
研究成果
La5Ti2AgS5O7, when co-loaded with Pt and NiS cocatalysts, exhibits the highest Z-scheme water splitting performance in powder suspension systems, achieving an AQY of 0.12% at 420 nm. This contrasts with particulate sheet systems where p-type doping and solid solutions enhance activity, highlighting the need for system-specific optimization strategies.
研究不足
The apparent quantum yield is relatively low (0.12% at 420 nm), and deactivation occurs over time, possibly due to photocorrosion. The optimization strategies effective in particulate sheet systems are not applicable to powder suspension systems, limiting generalizability.
1：Experimental Design and Method Selection:
The study involved synthesizing La5Ti2CuxAg1-xS5O7 (x=0-1) photocatalysts via solid-state reaction, characterizing them using XRD, DRS, SEM, HR-TEM, XPS, XANES, and EXAFS, and evaluating their photocatalytic H2 evolution and Z-scheme water splitting activities under visible light irradiation.
2：Sample Selection and Data Sources:
Samples included LTA, LTC, LTCA, and Ga-LTCA, prepared and characterized as described. Data were acquired from photocatalytic reactions in aqueous solutions.
3：List of Experimental Equipment and Materials:
Equipment included a 300 W Xe lamp with a cut-off filter (λ > 420 nm), XRD, DRS, SEM, HR-TEM, XPS, XANES, and EXAFS instruments. Materials included Na2S, Na2SO3, NaI, Pt, NiS, and WO
4：Experimental Procedures and Operational Workflow:
Cocatalysts (Pt, NiS) were loaded via impregnation and in-situ precipitation methods. Photocatalytic H2 evolution was tested in solutions with sacrificial reagents, and Z-scheme water splitting was conducted with PtOx-WO3 as OEP and I3?/I? redox mediator.
5：Data Analysis Methods:
Activities were measured as H2 and O2 evolution rates, and AQY was calculated. Characterization data were analyzed to understand material properties and cocatalyst effects.
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