Fig. 4. (a) H2O2 production of sp2c-CTF-4@AA and sp2c-CTF-4@AB under different conditions (O2, N2, K2Cr2O7, TEOA); (b) DMPO spin-trapping EPR spectra of sp2c-CTF-4 for measuring O2˙−; (c) DMPO spin-trapping EPR spectra of sp2c-CTF-4 for measuring ˙OH; (d) the Koutecky–Levich plots obtained via RDE measurements in phosphate buffer (pH 7) solution with continuous O2 purging; (e) polarization curves recorded with simultaneous detection of H2O2 at the ring electrode at 1600 rpm; (f) summary of photocatalytic H2O2 evolution rates of sp2c-CTF-4 and other COF-based photocatalysts.
