Fig 1

(A) Schematic diagram of the as-prepared D-π-A type photocatalysts. SEM images of (B) MCN and (C) NAN-CN samples. TEM images of (D) MCN and (E) NAN-CN samples (inset of E is SAED pattern of NAN-CN sample). (F) HAADF image of NAN-CN sample. (G) Elemental mapping and (H) EDX spectroscopy of NAN-CN sample. (I) XRD patterns of the as-prepared samples."

Fig 2

(A) XPS survey spectra of the as-prepared samples. (B) High-resolution C 1s spectra, (C) high-resolution N 1s spectra and (D) high-resolution O 1s spectra of MCN and NAN-CN samples. High-resolution spectra of (E) C 1s and (F) N 1s of ABA-CN, ABN-CN and ABS-CN. (G) High-resolution S 2p spectra of ABS-CN sample."

Fig 3

(A, B) H2O2 production performance of the as-prepared samples. (C, D) Comparison of H2O2 production rate for the as-prepared various D-π-A type photocatalysts. (E) Cycling test of photocatalytic H2O2 production for NAN-CN. (F) Comparison of H2O2 production rate on NAN-CN with published literature in recent years."

Fig 4

(A) Comparison of photocatalytic hydrogen peroxide production performance of NAN-CN under different scavengers and atmospheres. (B–D) EPR signals of ·O2− of prepared samples in the presence of DMPO. (E, F) In situ FT-IR of NAN-CN samples during H2O2 production."

Fig 5

(A–C) UV-vis DRS and Kubelka-Munk plots of as-prepared samples. (D–F) Mott-Schottky plots of as-prepared samples. (H) Band diagram of as-prepared samples."

Fig 6

(A) Photocurrent response curves of as-prepared samples. (B) EIS Nyquist curves, (C) linear voltammetry scan curve and (D) converted Tafel slope curves, (E, F) PL spectra of the as-prepared samples. (G) TPV spectra, (H) maximum charge extraction time (tmax) and (I) maximum charge extraction efficiency of the as-prepared samples."

Fig 7

TRPL spectroscopy of (A) MCN, (B) NAN-CN, (C) ABA-CN, (D) ABN-CN and (E) ABS-CN samples. (F) SPV spectra of the as-prepared GCN, MCN and NAN-CN samples."