1：Experimental Design and Method Selection:

The study involved the preparation of ZnSe:CIGS photocathodes modified with RuO2 and Pt species to evaluate their PEC activities and stability for hydrogen evolution and MCH production. The methodology included photoelectrodeposition for surface modification and the use of a dual-chamber PEC cell for MCH production.

2：Sample Selection and Data Sources:

ZnSe:CIGS particles were synthesized by a flux method, and photocathodes were prepared using the particle transfer (PT) technique. The samples were characterized using XPS, SEM, and EDS analyses.

3：List of Experimental Equipment and Materials:

A potentiostat (Hokuto Denko, HSV-110), gas chromatographs (Agilent Technologies, 490 Micro GC and Shimadzu, GC-2014), and simulated sunlight adjusted to AM 1.5G were used.

4：5G were used. Experimental Procedures and Operational Workflow:

4. Experimental Procedures and Operational Workflow: The PEC trials were conducted in a standard three-electrode configuration. The photocathodes were evaluated for hydrogen evolution and MCH production in a dual-chamber PEC cell with an aqueous 1.0 M K2HPO4 solution adjusted to pH 13 as the electrolyte and toluene containing 0.01vol% MCH and 0.01vol% cyclohexane as the organic reactant.

5：0 M K2HPO4 solution adjusted to pH 13 as the electrolyte and toluene containing 01vol% MCH and 01vol% cyclohexane as the organic reactant. Data Analysis Methods:

5. Data Analysis Methods: The amount of hydrogen and MCH generated was determined using gas chromatography. XPS and SEM analyses were used to characterize the photocathodes.