1：Experimental Design and Method Selection:

The study employed a facile solvothermal synthesis for TiO2 nanocubes (TNCB) followed by in-situ photodeposition of Pt nanoparticles under ultraviolet light irradiation to create Pt-TNCB composites. This design aimed to utilize the SPR effect of Pt for improved visible-light absorption and charge separation.

2：Sample Selection and Data Sources:

Samples included TNCB and Pt-TNCB with varying Pt concentrations (0.1%, 0.3%, 0.5%, 0.7%, 0.9%). Data were sourced from synthesized materials and characterized using various techniques.

3：1%, 3%, 5%, 7%, 9%). Data were sourced from synthesized materials and characterized using various techniques. List of Experimental Equipment and Materials:

3. List of Experimental Equipment and Materials: Equipment included X-ray diffraction (XRD) for crystal structure analysis, Raman spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution TEM (HRTEM), UV-vis reflectance spectroscopy, nitrogen adsorption-desorption isotherms, X-ray photoelectron spectroscopy (XPS), photoluminescence (PL) spectroscopy, transient fluorescence spectroscopy, photoelectrochemical measurements, and photocatalytic H2 evolution setup under AM 1.5 illumination (100 mW cm-2). Materials included TiO2 precursors, H2PtCl6 solution for Pt deposition, and catalysts for hydrogen evolution tests.

4：5 illumination (100 mW cm-2). Materials included TiO2 precursors, H2PtCl6 solution for Pt deposition, and catalysts for hydrogen evolution tests. Experimental Procedures and Operational Workflow:

4. Experimental Procedures and Operational Workflow: TNCB was synthesized via solvothermal method. Pt NPs were photodeposited in-situ on TNCB under UV light. Characterization involved XRD, Raman, SEM, TEM, HRTEM, UV-vis, BET surface area analysis, XPS, PL, transient fluorescence, photocurrent response, electrochemical impedance spectroscopy, and photocatalytic H2 evolution measurements. Hydrogen evolution was measured using a gas chromatograph or similar detector.

5：Data Analysis Methods:

Data were analyzed using Tauc plots for band gap calculation, BET method for surface area, XPS for elemental and chemical state analysis, PL intensity for charge recombination rates, transient fluorescence for lifetime measurements, and statistical comparison of H2 evolution rates.