Tunable Carrier Transfer of Polymeric Carbon Nitride with Charge-Conducting CoV2O6∙2H2O for Photocatalytic O2 Evolution

Abstract

Photocatalytic water splitting is one of the promising approaches to solving environmental problems and energy crises. However, the sluggish 4e− transfer kinetics in water oxidation half-reaction restricts the 2e− reduction efficiency in photocatalytic water splitting. Herein, cobalt vanadate-decorated polymeric carbon nitride (named CoVO/PCN) was constructed to mediate the carrier kinetic process in a photocatalytic water oxidation reaction (WOR). The photocatalysts were well-characterized by various physicochemical techniques such as XRD, FT-IR, TEM, and XPS. Under UV and visible light irradiation, the O2 evolution rate of optimized 3 wt% CoVO/PCN reached 467 and 200 μmol h−1 g−1, which were about 6.5 and 5.9 times higher than that of PCN, respectively. Electrochemical tests and PL results reveal that the recombination of photogenerated carriers on PCN is effectively suppressed and the kinetics of WOR is significantly enhanced after CoVO introduction. This work highlights key features of the tuning carrier kinetics of PCN using charge-conducting materials, which should be the basis for the further development of photocatalytic O2 reactions.

Strong Metal Support Effect of Pt/g-C3N4 Photocatalysts for Boosting Photothermal Synergistic Degradation of Benzene

“…The characteristic peaks of N 1s in Figure 3 d located at 398.3 and 400.0 eV corresponded to C–N=C and N–(C) 3 groups, respectively. Both of them together with the sp 2 –C (N–C=N) make up the C 6 N 7 units [ 51 ]. The last one of N 1s at 401.1 eV arose from the uncondensed C–N–H groups of g-C 3 N 4 .…”

Insights from Ethylene Glycol Oxidation toward Reduction in the Overpotential Using Sonochemically Derived Orthorhombic CoV2O6·2H2O Sheetlike Structures

“…This aspect triggered the researchers to investigate low-temperature synthesis (≤373 K), which is cost-effective and suitable for large-scale production. Notably, very few reports are available pertaining to the synthesis of CoV 2 O 6 ·2H 2 O through hydrothermal and microwave methods. ,, The CoV 2 O 6 ·2H 2 O NSs derived from the microwave method used for the construction of a battery type supercapacitor exhibited an energy density of 19 Wh kg –1 . Hydrothermally derived g-C 3 N 4 /CoV 2 O 6 ·2H 2 O has been used as a catalyst for the photocatalytic oxygen evolution reaction .…”

“…Notably, very few reports are available pertaining to the synthesis of CoV 2 O 6 ·2H 2 O through hydrothermal and microwave methods. ,, The CoV 2 O 6 ·2H 2 O NSs derived from the microwave method used for the construction of a battery type supercapacitor exhibited an energy density of 19 Wh kg –1 . Hydrothermally derived g-C 3 N 4 /CoV 2 O 6 ·2H 2 O has been used as a catalyst for the photocatalytic oxygen evolution reaction . Collectively, the goal of CoV 2 O 6 ·2H 2 O synthesis using a simple synthesis protocol and its usage as an electrocatalyst toward the OER with hybrid electrolytic systems are relatively less investigated.…”

“…39 Hydrothermally derived g-C 3 N 4 /CoV 2 O 6 •2H 2 O has been used as a catalyst for the photocatalytic oxygen evolution reaction. 40 Collectively, the goal of CoV 2 O 6 •2H 2 O synthesis using a simple synthesis protocol and its usage as an electrocatalyst toward the OER with hybrid electrolytic systems are relatively less investigated. Motivated by these gaps in analyses, we aim to design hierarchical cobalt vanadates under the assistance of a sonochemical approach within a shorter reaction time, and their performance toward the electrolysis of water in an alkaline medium with and without EG is investigated.…”

Surface reconstructed polymeric carbon nitride with promoted carrier separation for photocatalytic H2O2production

“…5d). A small semicircle radius was observed for PCN-SR, suggesting that surface reconstruction decreased the charge transfer resistance in PCN-SR. 36 Both results demonstrate that the introduction of cyano groups, nitrogen vacancies and lithium doped atoms could boost electron and hole separation and migration, further improving H 2 O 2 evolution under irradiation.…”