1：Experimental Design and Method Selection:

The study involves synthesizing Pt-TiO2/CdS photocatalysts via calcination and photodeposition methods to create a strong coupling interface between TiO2 and CdS, followed by oriented loading of Pt on TiO2 surface using visible-light induced deposition. The design rationale is to utilize TiO2 as an electron-transport and hole-block layer to improve charge separation and transfer.

2：Sample Selection and Data Sources:

Samples include bare CdS, Pt/CdS, TiO2/CdS with varying TiO2 amounts (3, 5, 8, 10 wt%), and Pt-TiO2/CdS composites. CdS is synthesized by precipitation from Cd(NO3)2 and Na2S solutions, with TiO2 added via impregnation and calcination. Data sources are experimental measurements from characterization and photocatalytic tests.

3：List of Experimental Equipment and Materials:

Equipment: JSM-7500 FESEM (JEOL), JEM-2100F TEM (JEOL), Rotation Anode High Power X-ray Diffractometer (Japan), Thermo Fisher EscaLab 250Xi XPS system, UV-2450 UV-vis diffusion reflectance spectra (Shimadzu), 350-W xenon arc lamp with UV cutoff filter (λ ≥ 420 nm), GC-2014C gas chromatograph (Japan), CHI660E electrochemical workstation, 420-nm LED (3-W). Materials: Cd(NO3)2, Na2S, TiO2 nanoparticles, H2PtCl6, Na2S/Na2SO3 solution, Nafion-ethanol solution (D-520, 1 wt%), FTO glass, Pt wire, Ag/AgCl electrode, BaSO4 reference.

4：Experimental Procedures and Operational Workflow:

Synthesis of TiO2/CdS: Mix TiO2 with Cd(NO3)2 solution, add Na2S solution, stir, age, wash, dry, and calcine at 823K in N

5：Synthesis of Pt-TiO2/CdS:

Deposit Pt on TiO2/CdS via visible-light induced photoreduction of PtCl6^2- ions. Photocatalytic H2-generation: Add photocatalyst to Na2S/Na2SO3 solution with H2PtCl6, purge with N2, irradiate with visible light, measure H2 using gas chromatography. Photoelectrochemical tests: Prepare working electrode by coating photocatalyst on FTO glass, use Pt wire counter electrode and Ag/AgCl reference electrode in Na2SO4 electrolyte, measure I-T curves and EIS under N2 atmosphere with 420-nm LED illumination.

6：Data Analysis Methods:

Morphology and structure analyzed via FESEM, TEM, XRD. Chemical states determined by XPS. Light absorption measured by UV-vis DRS. Photocatalytic activity assessed by H2 production rate. Charge transfer efficiency evaluated through photocurrent density (I-T curves) and electrochemical impedance spectroscopy (EIS).