1：Experimental Design and Method Selection:

The study involved the synthesis of AgTaO3 by a solid-state reaction and loading of various cocatalysts (Rh

2：5Cr5O3, Cr2O3, RuO2, NiO, Pt) to examine their effects on photocatalytic water splitting. Sample Selection and Data Sources:

AgTaO3 was synthesized using Ag2O and Ta2O5 as starting materials. The cocatalysts were loaded using different methods (photodeposition, impregnation).

3：List of Experimental Equipment and Materials:

Equipment included a 300 W Xe-arc lamp, a solar simulator, a gas chromatograph, and various spectrometers for characterization. Materials included Ag2O, Ta2O5, and cocatalyst precursors.

4：Experimental Procedures and Operational Workflow:

Photocatalytic water splitting was carried out in a gas-closed-circulation system. The activity was measured under UV and simulated sunlight irradiation.

5：Data Analysis Methods:

The amounts of evolved H2 and O2 were determined with a gas chromatograph. Apparent quantum yields and solar to hydrogen conversion efficiency were calculated using specific equations.