1：Experimental Design and Method Selection:

The study involved designing 0D/2D AgInS2/Ti3C2 Z-scheme heterojunctions via hydrothermal synthesis to enhance charge separation and N2 fixation. Theoretical models included DFT calculations for adsorption energies and band alignment analysis.

2：Sample Selection and Data Sources:

Samples were synthesized with varying mass ratios of AgInS2 to Ti3C2 (10-50 wt%), labeled AT-10 to AT-50. Data sources included experimental measurements of photocatalytic performance and computational simulations.

3：Data sources included experimental measurements of photocatalytic performance and computational simulations. List of Experimental Equipment and Materials:

3. List of Experimental Equipment and Materials: Equipment included X-ray diffractometer (XRD, D8 Advance), XPS (Thermo ESCALAB 250XI), FESEM (Hitachi SU8010), TEM (JEOL 2100), UV-vis spectrophotometer (JASCO UV-550), PL spectrophotometer (Hitachi F-4500), FS5 fluorescence lifetime spectrophotometer (Edinburgh Instruments), CHI 760E electrochemical workstation, and 300 W Xe lamp (CEL-HXF300). Materials included Ti3AlC2 powder, AgNO3, In(OAC)3·6H2O, thioacetamide, L-cysteine, HF, methanol, and others as listed.

4：0). Materials included Ti3AlC2 powder, AgNO3, In(OAC)3·6H2O, thioacetamide, L-cysteine, HF, methanol, and others as listed. Experimental Procedures and Operational Workflow:

4. Experimental Procedures and Operational Workflow: Ti3C2 nanosheets were prepared by etching Ti3AlC2 with HF, followed by hydrothermal synthesis of AgInS2/Ti3C2 composites. Photocatalytic tests involved dispersing samples in methanol solution under N2 atmosphere, irradiating with visible light, and measuring NH4+ concentration via indophenol blue method. Characterization included XRD, XPS, TEM, UV-Vis DRS, PL, EIS, and photocurrent measurements.

5：Data Analysis Methods:

Data analysis involved Tauc's plot for band gap calculation, exponential decay kinetics for PL lifetime, Nyquist plots for EIS, and DFT simulations for adsorption energies and charge density differences using CASTEP with PBE-GGA and PAW potential.