1：Experimental Design and Method Selection:

The study involved synthesizing wrinkled n-type WS2 nanosheets via a calcination method and constructing In2.77S4/WS2 p-n heterojunctions using an in-situ hydrothermal method to enhance photocatalytic activity. Theoretical models for band gap energy and charge transfer were applied.

2：77S4/WS2 p-n heterojunctions using an in-situ hydrothermal method to enhance photocatalytic activity. Theoretical models for band gap energy and charge transfer were applied. Sample Selection and Data Sources:

2. Sample Selection and Data Sources: Samples included pure In2.77S4, WS2, and their hybrids with varying WS2 content (2, 4, 6 wt%). Data were obtained from photocatalytic tests, characterization techniques, and electrochemical measurements.

3：77S4, WS2, and their hybrids with varying WS2 content (2, 4, 6 wt%). Data were obtained from photocatalytic tests, characterization techniques, and electrochemical measurements. List of Experimental Equipment and Materials:

3. List of Experimental Equipment and Materials: Equipment included XRD (BRUKER D8), BET surface area analyzer (ASAP 2020, Micromeritics Instrument Corp.), TEM (JEM 2100, JEOL), XPS (ESCALAB 250Xi, Thermo Fisher Scientific), UV-vis DRS (U-4100, Hitachi), electrochemical workstation (CHI760, Shanghai Chenhua), and a 300 W Xenon lamp system (CEL-HXF300, Beijing Zhongjiao Jinyuan Technology). Materials included In(NO3)3·4.5H2O, WO3, thiourea, TAA, and various chemicals from suppliers like Sinopharm Chemical Reagent Co., Ltd.

4：5H2O, WO3, thiourea, TAA, and various chemicals from suppliers like Sinopharm Chemical Reagent Co., Ltd. Experimental Procedures and Operational Workflow:

4. Experimental Procedures and Operational Workflow: WS2 was synthesized by calcining a mixture of WO3 and thiourea. Heterojunctions were prepared by dispersing WS2 and In(NO3)3·4.5H2O in water, adding TAA, and hydrothermally treating at 180°C for 12 h. Photocatalytic tests involved irradiating mixtures with Cr(VI) or TC solutions, sampling at intervals, and measuring concentrations with a spectrophotometer. Electrochemical tests used three-electrode setups.

5：5H2O in water, adding TAA, and hydrothermally treating at 180°C for 12 h. Photocatalytic tests involved irradiating mixtures with Cr(VI) or TC solutions, sampling at intervals, and measuring concentrations with a spectrophotometer. Electrochemical tests used three-electrode setups. Data Analysis Methods:

5. Data Analysis Methods: Data were analyzed using equations for photocatalytic efficiency (C/C0), reaction kinetics (pseudo-first-order model), band gap energy (Tauc plot), and electrochemical impedance. Software tools were not specified.