Fig. 5: Photocatalytic hydrogen evolution.
From: Solar-driven fast photocatalytic hydrogen evolution using size-minimized organic heterojunctions
a Schematic diagram of solar-driven photocatalytic hydrogen evolution with sacrificial agent and Pt. b The structures of TEBS and PEBS. c HER-a/HER-m versus concentration for BTR:L8-BO NPs (D:A, w:w, 5:5, 0.4 wt.% PEBS, 20 wt.% Pt loading) without or with COF in 0.2 M AA under AM1.5 G, 100 mW cm−2 (the average values ± standard deviations for 3 samples). d SEM morphology of the COF and the NP@COF composite (BTR:L8-BO 5:5 NPs, 0.4 wt.% PEBS/H2O, 20 wt.% Pt loading). The dashed square in the middle panel indicates the region enlarged in the right panel, where NPs are highlighted with white circles. e Absorption spectrum and EQEs at 400, 500, 600, 700, and 808 nm of BTR:L8-BO NPs (D:A, w:w, 5:5, 0.4 wt.% PEBS/H2O, 20 wt.% Pt loading)@COF in 0.2 M AA at a NP concentration of 53.33 μg mL−1. f The photo of BTR:L8-BO NPs (D:A, w:w, 4:6, 0.4 wt.% TEBS/H2O) in (I) water; (II) 0.6 M NaCl aqueous solution and BTR:L8-BO NPs (D:A, w:w, 4:6, 0.4 wt.% TEBS/H2O, 70 wt.% Pt loading)@COF in (III) water; (IV) 0.6 M NaCl aqueous solution under 650 nm laser illumination. The NP concentration is 50 μg mL−1. g HER-m of BTR:L8-BO NPs (4:6, w:w, 0.4 wt.% TEBS/H2O)@COF in 0.2 M antibiotics aqueous solution under AM1.5 G, 100 mW cm−2 for 4 h and in a mixed solution of 0.6 M NaCl and 0.2 M AA under AM1.5 G, 100 mW cm−2 for 10 h. Notably, NPs without COF are not stable and do not generate hydrogen in such high-salinity conditions. For all the above photocatalytic reactions, the solvent volume was 7.5 mL, and the reactions were carried out at 5 °C. All the weight ratio of NP:COF in Fig. 5 is 10:8 (w:w).
