1：Experimental Design and Method Selection:

A one-step pyrolysis method was used to synthesize carbon modified graphitic carbon nitride (CCN) by mixing kapok fiber (KF) with melamine. The process involved calcination at various temperatures (550°C, 600°C, 650°C) in a muffle furnace with air atmosphere. Nash Equilibrium from Game Theory was applied to analyze H2 generation rates.

2：Sample Selection and Data Sources:

Kapok fibers were collected from Shenzhen University. Melamine (99%) and sodium chlorite (80%) were purchased from Aladdin, China. Precursors were mixed in specific weight ratios.

3：List of Experimental Equipment and Materials:

Muffle furnace, alumina crucibles, Xe lamp (CEAULIGHT, CEL-HXF30 and CEL-HXF300), cut filters (CEAULIGHT, CEL-UVIRCUT420), band-pass filters (CEAULIGHT, CEL-QD420, CEL-QD470, CEL-QD550), gas chromatography (CEAULIGHT, GC-7920), electrochemical workstation (CHI 660E), X-ray diffractometer (Rigaku Ultima IV), FTIR spectrometer (Thermo Scientific Nicolet iz10), XPS system (Thermo Scientific ESCALAB 250Xi), FESEM (JEOL JSM-7800F), TEM (JEOL JEM-2100 Plus), AFM (Bruker MULTIMODE), TGA/DSC analyzer (Mettler Toledo), surface area analyzer (Quantachrome Autosorb-IQ-MP/XR), UV-vis spectrophotometer (PerkinElmer LAMBDA), photoluminescence spectrometer (Shimadzu RF-5301PC), ESR spectrometer (ER200-SRC-10/12).

4：2). Experimental Procedures and Operational Workflow:

4. Experimental Procedures and Operational Workflow: Precursors were mixed, calcined, ground into powders. Photocatalytic H2 evolution was measured in a reaction cell with triethanolamine as sacrificial agent and H2PtCl6 for Pt loading, under Xe lamp irradiation with specific filters. Photoelectrochemical measurements involved electrophoresis deposition on FTO substrates. Characterization included XRD, FTIR, XPS, SEM, TEM, AFM, TGA, BET surface area analysis, DRS, PL, and ESR.

5：Data Analysis Methods:

H2 evolution rates were monitored by gas chromatography. Apparent quantum yields were calculated using a specific equation. Data from characterization techniques were analyzed to determine structural, chemical, and optical properties.