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

Abstract

Owing to the excellent oxygen-capture ability, the modified PCN presents excellent photocatalytic activity and stability for H2O2 production.

Visible light-driven H2O2 synthesis over Au/C3N4: medium-sized Au nanoparticles exhibiting suitable built-in electric fields and inhibiting reverse H2O2 decomposition

“…The results show that the PL decay lifetimes of the samples are in the order of Au/CN-100 (5.58 ns) > Au/CN-50 (5.18 ns) > Au/CN-150 (5.11 ns) > Au/CN (5.03 ns) > CN (4.98 ns). 29 The TRPL decay curves are fitted by the following biexponential model (eqn (3)), where τ 1 and τ 2 are the short and long lifetimes, respectively, while A 1 and A 2 are the corresponding amplitudes. Using τ 1 and τ 2 , the samples’ average lifetime ( τ av ) is calculated according to eqn (4) 30 I ( t ) = A 1 e − t / τ 1 + A 2 e − t / τ 2 τ = ( A 1 τ 1 2 + A 2 τ 2 2 )/( A 1 τ 1 + A 2 τ 2 )…”

“…27 The results indicate that Au loading maximizes the synergistic effect between Au and CN in the heterojunction, which is beneficial for optimizing the photocatalytic activity. 28 29 The TRPL decay curves are fitted by the following biexponential model (eqn (3)), where t 1 and t 2 are the short and long lifetimes, respectively, while A 1 and A 2 are the corresponding amplitudes. Using t 1 and t 2 , the samples' average lifetime (t av ) is calculated according to eqn (4) 30…”

Hydrophobized Poly(Heptazine Imide) for Highly Effective Photocatalytic Hydrogen Peroxide Production in a Biphasic Fatty Alcohol-Water System

“…15 The ionic form of this material comprising stacks of 2D heptazine-based networks and alkali metal cations and/or protons, poly(heptazine imide) (PHI), 13,[16][17][18][19][20][21][22][23][24][25][26] otherwise known as CNx-NCN, KSCN-or alkali metal modified carbon nitride, typically outperforms the conventional, non-ionic, melon polymer in this reaction. 10,27 The superior activity of PHI can be explained, among other factors, by partial substitution of the terminal NH2-groups for -N --CN species in PHI, resulting in fewer hydrogen bond interactions and better dispersibility of the material in polar solvents. 28 A major challenge in carrying out such reactions in suspension is the effective separation of the dissolved reduction and oxidation products for their subsequent use, in order to avoid the decomposition of H2O2 on the surface of the photocatalyst by photoredox decomposition or by its disproportionation in the dark.…”

Ultrahigh Performance H2O2 Generation by Single‐Atom Fe Catalysts with N/O Bidentate Ligand via Oxalic Acid and Oxygen Molecules Activation

“…[7,8] However, this process possesses some disadvantages such as the formation of by-product, high cost, and high energy consumption. [9][10][11] Hence, exploring high-efficiency and convenient strategies to eliminate these barriers is indispensable.Semiconductor-based photocatalysis is considered as a suitable method for H 2 O 2 generation, which requires only absorb solar light without additional electrical energy and chemical reagent. [12][13][14] The photocatalytic generation of H 2 O 2 is a typical proton-coupled electron transfer process, and this process primarily involves two-step single electron transfer or one-step two electron O 2 reduction.…”

“…[7,8] However, this process possesses some disadvantages such as the formation of by-product, high cost, and high energy consumption. [9][10][11] Hence, exploring high-efficiency and convenient strategies to eliminate these barriers is indispensable.…”