Fig. 2: Spatiotemporal distribution of reactive oxygen species (ROS) generated in the Pd–Pt–CM.
From: Janus electrocatalytic flow-through membrane enables highly selective singlet oxygen production
a Schematic illustrating the cross-flow filtration system containing a feed reservoir (Region A, gray) and an electrofiltration module with a 12 mL feed chamber (Region B, orange), a 12 mL permeate chamber (Region C, blue), and the Pd–Pt–CM. b EPR analysis for 1O2 in different regions of the filtration system using 2,2,6,6-tetramethylpiperidine (TEMP, 25 mM) as the trapping agent. EPR measurement of the TEMP-1O2 adduct in the permeate (Region C) of the filtration system using an N2-saturated feed solution is conducted for comparison. c 1O2 generation indicated by the degradation of furfuryl alcohol (FFA, 50 μM). d H2O2 detection measured by Amplex Red color reaction. e Detection of O2•− by using 2,3-Bis-(2-methoxy-4-nitro-5-sulfophenyl)-2H-tetrazolium-5-carboxanilide (XTT, 100 μM) as the probe. f •OH measurement by applying terephthalate (TPA, 1 mM) which reacts with •OH to form hydroxyterephthalate (hTPA). Error bars represent standard deviations from triplicate experiments.
