In Situ Synthesis of Cu₃P/P‐Doped g‐C₃N₄ Tight 2D/2D Heterojunction Boosting Photocatalytic H₂ Evolution^†

Abstract

Comprehensive SummaryHeterojunction design in a two‐dimensional (2D) fashion has been deemed beneficial for improving the photocatalytic activity of g‐C3N4 because of the promoted interfacial charge transfer, yet still facing challenges. Herein, we construct a novel 2D/2D Cu3P nanosheet/P‐doped g‐C3N4 (PCN) nanosheet heterojunction photocatalyst (PCN/Cu3P) through a simple in‐situ phosphorization treatment of 2D/2D CuS/g‐C3N4 composite for photocatalytic H2 evolution. We demonstrate that the 2D lamellar structure of both CuS and g‐C3N4 could be well reserved in the phosphorization process, while CuS and g‐C3N4 in‐situ transformed into Cu3P and PCN, respectively, leading to the formation of PCN/Cu3P tight 2D/2D heterojunction. Owing to the large contact area provided by intimate face‐to‐face 2D/2D structure, the PCN/Cu3P photocatalyst exhibits significantly enhanced charge separation efficiency, thus achieving a boosted visible‐light‐driven photocatalytic behavior. The highest rate for H2 evolution reaches 5.12 μmol·h–1, nearly 24 times and 368 times higher than that of pristine PCN and g‐C3N4, respectively. This work represents an excellent example in elaborately constructing g‐C3N4‐based 2D/2D heterostructure and could be extended to other photocatalyst/co‐catalyst system.

Carbon Nitride with Single‐Atom Nickel as Co‐Catalyst for Visible‐Light Promoted C—O Coupling†

“…The EIS results show that the Ni 1 ‐mpg‐CN 18 has a smaller arc radius (Figure S9a), elucidating its lower resistance for fast interfacial charge carrier transfer. [ 33 ] A similar tendency was observed in the transient photocurrent response (Figure S9b). The photocurrent density of the Ni 1 ‐mpg‐CN 18 is much higher than that of the other photocatalysts, which indicates the recombination of photogenerated electron‐hole pairs was greatly inhibited.…”

Modulation of Excitonic Confinement of TiO2 in Molten Salts for Overall CO2 Photoreduction†

“…[ 19‐20 ] Z‐scheme heterojunction can effectively increase spatially separation efficiency of photogenerated electron‐hole pairs and maxmize redox capacity. [ 21‐22 ] The Z‐type charge transportation correlates with the band bending and built‐in electric field at the junction. [ 23 ] Therefore, designing Z‐scheme heteroatom‐contained TiO 2 heterojunction is efficient to achieve high‐performance overall CO 2 photoreduction, which remains unexplored.…”

Modification of an oxyhalide solid-solution photocatalyst with an efficient O2-evolving cocatalyst and electron mediator for two-step photoexcitation overall water splitting

“…Under these circumstances, many efficient particu-late photocatalysts with narrow bandgaps for water splitting have been extensively explored and achieved immense development of efficient water splitting. [4][5][6][7][8][9][10] These attempts are mainly accomplished through two approaches, namely, one-step photoexcitation overall water splitting on a single photocatalyst and two-step photoexcitation overall water splitting mimicking photosynthesis in a green plant. 11 For one-step photoexcitation water splitting, a lot of metal oxide photocatalysts were active under UV irradiation.…”