In-situ photovoltage transients assisted catalytic study on H2O2 photoproduction over organic molecules modified carbon nitride photocatalyst

Improved H2O2 photogeneration and stability on rational tailored polymeric carbon nitride via enhanced O2 adsorption

“…23 Some problems exist for photocatalytic H 2 O 2 production of pristine PCN, such as fourelectron O 2 reduction reaction, limited oxygen-capture ability, and H 2 O 2 production hindrance by the strong recombination of photogenerated electron-hole pairs. 24,25 Recently, different strategies, including the modication of PCN with MXene (Ti 3 C 2 ) or carbon materials, 26,27 generation of carbon or nitrogen vacancies, 17,28,29 the addition of cationic surfactant, 30 and elemental or molecular doping, [31][32][33][34][35] have been developed to increase the photocatalytic activity of PCN toward producing H 2 O 2 . Despite some of them having achieved excellent photocatalytic activity, the modied PCN strategies are still inadequate, because O 2 needs to be continuously pumped in the process of reaction.…”

Highly efficient photosynthesis of H2O2via two-channel pathway photocatalytic water splitting

“…The transient photovoltage (TPV) was measured to better clarify the mechanism of CdS-1 photocatalytic water splitting to produce H 2 O 2 . 27,38 As shown in Fig. 5(e), the photocurrent intensity of CdS-1 is much higher than that of CdS-0, indicating that the surface of CdS-1 has a greater charge concentration and that the surface of CdS-1 has a greater charge concentration and higher electron–hole separation efficiency.…”

Organic Semiconductor/Carbon Dot Composites for Highly Efficient Hydrogen and Hydrogen Peroxide Coproduction from Water Photosplitting

“…In order to explore the catalytic mechanism of DAnTMS and DAnTMS/CDs, ex situ TPV measurements were carried out. As shown in Figure a, the rate of the charge recombination process of the catalysts is estimated through the attenuation constants (τ). , Although the intensity of photovoltage of DAnTMS/CDs is lower than that of DAnTMS, it has a larger τ value (τ 2 = 0.10231 ms), which is almost twice the τ value of DAnTMS (τ 2 = 0.05474 ms), suggesting that CDs slowed the charge recombination process. Figure b shows that DAnTMS exhibits a faster charge extraction process ( t max1 ) compared with that of DAnTMS/CDs ( t max2 ), implying that CDs also slow the extraction of charges.…”