SummaryExperimental Sectionfig. S1. Molecular structures of precursors.fig. S2. Temperature and time profile of pyrolysis and carbonization process.fig. S3. FESEM images of the sample after pyrolysis at different temperatures.fig. S4. Low-magnification FESEM image of the N-GRW.fig. S5. FESEM images of samples prepared with different melamine–to–l-cysteine ratios.fig. S6. XPS spectra of C3N4 and S-doped C3N4.fig. S7. TEM…