Fig. 5: Semiconductor-like photocatalysis for O2•− generation.
a Schematic illustration of the molecular orbital diagram of Pcs and the band diagram of NanoPcs. The excited Pcs transfer energy to O2, generating 1O2. The excited NanoPcs transfer electron to O2, generating O2•−. b Mott-Schottky plots of NanoNMe under dark conditions (100 Hz). The lyophilized NanoNMe adhered ITO glass was served as the working electrode, Ag/AgCl as the reference electrode, and platinum wire as the counter electrode, with 0.2 M Na2SO4 as the supporting electrolyte. c UPS valence band spectrum of NanoNMe. The work function (Φ) was calculated through the formula Φ = hν - (cutoff - Ef), where the excitation energy of the He light source was 21.22 eV. The VB potential was calculated through the formula EVB (NHE) = Ef + Φ - 4.44. d Band diagram of NanoNMe, including CB, VB potentials and the band gap. e Representative photocurrent response of NanoNMe and NanoCN on an ITO glass electrode with the interval of 20 s. f Electrochemical impedance spectroscopy of NanoNMe and NanoCN. Ag/AgCl served as the reference electrode, platinum wire as the counter electrode, and 0.2 M Na2SO4 as the supporting electrolyte with a bias of −0.2 V, white light, 180 mW·cm-2. g Changes in conductivity of NanoNMe, NanoCN, and NMe (all at 1 mg·mL-1) over time with the interval of 30 s, white light, 180 mW·cm-2. n = 3 independent samples with similar results. Data are presented as mean values ± SD.
