1：Experimental Design and Method Selection:

The study involved synthesizing Cr-doped BiOCl (Cr-BOC) via a hydrothermal method and Ag-modified Cr-BOC (Cr-BOC/Ag) via photoreduction. Photocatalytic activity was evaluated using RhB, MO, and TC degradation under visible light. A PFC system was constructed with Cr-BOC/Ag as photoanode, Pt as cathode, and Ag/AgCl as reference electrode.

2：Sample Selection and Data Sources:

Samples included pure BiOCl, Cr-BOC with varying Cr doping (mass ratios from experimental dosages), and Cr-BOC/Ag with varying Ag loading (mass ratios from AgNO3 dosages). Pollutants used were RhB, MO, and TC in aqueous solutions.

3：List of Experimental Equipment and Materials:

Equipment included Rigaku D/max 2500 X-ray diffractometer, FE-SEM Hitachi S-4800, TEM Tecnai G2 F20, XPS ESCALAB 250, UV-vis spectrophotometer Hitachi U-4100, ESR Brucker A300, FluoroMax-4 Spectrofluorometer, CHI660E workstation, 300 W Xe lamp with cutoff filter, total carbon analyzer Shimadzu. Materials included Bi(NO3)3·5H2O, NaCl, Mannitol, PVP-30K, CrCl3·6H2O, AgNO3, Ethanol, RhB, MO, TC, Na2SO4 from Sinopharm Chemical Reagent Co.

4：Experimental Procedures and Operational Workflow:

Synthesis of Cr-BOC involved hydrothermal reaction at 160°C for 3h. Synthesis of Cr-BOC/Ag involved photoreduction under visible light for 1h. Characterization included XRD, SEM, TEM, XPS, DRS, ESR, PL, 3D EEMs. Photocatalytic tests involved dispersing catalysts in pollutant solutions, stirring in dark for 30min, irradiating with visible light, sampling at intervals, and measuring concentrations. PFC measurements used a three-electrode system with FTO substrates, supporting electrolyte Na2SO4, and various fuels.

5：3h. Synthesis of Cr-BOC/Ag involved photoreduction under visible light for 1h. Characterization included XRD, SEM, TEM, XPS, DRS, ESR, PL, 3D EEMs. Photocatalytic tests involved dispersing catalysts in pollutant solutions, stirring in dark for 30min, irradiating with visible light, sampling at intervals, and measuring concentrations. PFC measurements used a three-electrode system with FTO substrates, supporting electrolyte Na2SO4, and various fuels. Data Analysis Methods:

5. Data Analysis Methods: Data analyzed using UV-vis spectrophotometry for concentration measurements, electrochemical techniques for photocurrent, EIS, J-V curves, and IPCE. Statistical analysis included standard deviations from triplicate experiments. TOC analysis for mineralization efficiency, and Coulombic efficiency calculated from integrated current and COD changes.