A facile supramolecular aggregation of trithiocyanuric acid with PCN for high photocatalytic hydrogen evolution from water splitting

Abstract

Summary Polymeric carbon nitride (PCN) is a promising hotspot metal‐free material for artificial photosynthesis, solar energy conversion, and photo degradation of pollutant, hence predicting unsatisfactory photocatalytic efficiency due to fast charge recombination. Here, we implemented a remediation approach to fuel its catalytic performance by interpretation of a sulfur rich‐material, ie, trithiocyanuric acid (TTCA) in the framework of PCN by traditional one facile protocol called copolymerization (molecular assembled) under nitrogen at 550°C. Results demonstrate that the integration of TTCA comonomer into the triazine oligomers of PCN widens the specific surface area, extends the lifetime of photoexcited charge carriers, speeds up the rate of photogenerated electrons optimized from lower energy state toward high energy state, lowers the rate of charge recombination and band gap, and modulates its electronic structure and optical properties in a regular fashion as compared with pristine PCN. Ultimately, due to aforementioned modification, the copolymerized PCN semiconductor predicts superior photocatalytic properties of hydrogen energy production about 7 times higher than that of pristine PCN from the water splitting system.

High photoresponse and fast carrier mobility: Two‐dimensional rGO‐AgBr/Ag composite based on Z‐scheme heterointerface with plasma for hydrogen evolution

“…UV-vis DRS in Figure 7A shows that the rGAA-α present almost full spectrum absorption with significantly increased ability with the increase of Ag/AgBr addition compared with pristine rGO and AgBr, which ascribes to the construction of rGO-AgBr heterointerface and generation of Ag plasmas with surface plasmon resonance (SPR) effect. 74,75 Then, the band gap of AgBr was calculated as 1.93 eV from the fitted band gap spectra in Figure 7B. 76 PL analysis was performed under the excitation wavelength of 375 nm to study the combination efficiency of photoinduced carriers ( Figure 7C).…”

Homogeneous iron‐doped carbon‐nitride‐based organo‐catalysts for sensational photocatalytic performance driven by visible light

“…Graphitic carbon nitride (g‐CN) has a unique 2D and tunable electronic structure with a conduction band (CB) and valence band (VB) of −1.1 and 1.6 eV and an energy band gap of 2.7 eV 5–7 . This material has attracted the attention of scientists because of its unique and interesting physicochemical properties 8–10 . Due to fast recombination of electron–hole pairs and its moderate band gap, low conductivity limits its electrochemical and electronic applications.…”

Organic Conjugation of Polymeric Carbon Nitride for Improved Photocatalytic CO2 Conversion and H2 Fixation

“…Unfortunately, single PCN utilizes a limited amount of visible light that has rapid charge recombination, poor photogenerated electron carrier, and quantum efficiency to reinforce it toward the low photocatalytic activity. [18] Therefore, it is rational to predict a new strategy to facilitate the photocatalytic performance of PCN, such as the process of molecular doping [19] (copolymerization). Copolymerization is a standard technique through which we design the conjugation of PCN by fusing with well-known organic monomers in its framework through organic protocols.…”