Heterojunction‐Type Photocatalytic System Based on Inorganic Halide Perovskite CsPbBr₃^†

Abstract

of main observation and conclusion The heterojunction-type structure has shown significant merits in tuning the optical properties and carrier physics. Inspired by the excellent absorption capability of halide perovskite materials for visible light, a series of CsPbBr3/TiO2 heterojunction-type photocatalysts with various all-inorganic-perovskite/TiO2 ratios are successfully fabricated by the ligand-assisted reprecipitation (LARP) method. The heterojunction structure extends the light absorption of TiO2 with good chemical and structural stability. A Pb-O interaction at the CsPbBr3/TiO2 interface is observed by the XPS and confirmed by the TRPL showing improved interface carrier transport and stability. The heterojunction-type catalyst shows drastically enhanced photocatalytic activity towards the direct oxidation of toluene with O2 molecule, as an important reaction for organic chemical synthesis. The optimized sample shows an activity of 2356 μmol•g-1 •h-1 at 75 °C, 4 times of that of the naked CsPbBr3 nanocrystals, and 3 times of that of the bare TiO2. Based on the investigation with trapping agents, a reaction mechanism is hence proposed suggesting that the photo-generated hole may be involved in the rate-limiting step. This work demonstrates the potential of inorganic halide perovskite-based heterojunction structure for photocatalytic applications.

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

“…[ 6 ] Among these modification methods, constructing heterostructures with other semiconductors has been widely illustrated. [ 10 ] A lot of photocatalysts have been coupled with g‐C 3 N 4 to construct heterojunction, including metal oxides, [ 11‐12 ] metal chalcogenides, [ 13 ] metal (oxy)nitride, [ 14‐15 ] organic polymers, [ 16 ] metal organic framework (MOF). [ 17‐18 ] Especially, combining heterostructure with two‐dimensional (2D) structure of g‐C 3 N 4 to construct 2D/2D heterojunction could integrate their advantages to obtain a superposed enhancement on photocatalytic performance.…”

Targeted Management of Perovskite Film by Co(II) Sulfophenyl Porphyrin for Efficient and Stable Solar Cells†

“…Perovskite solar cells (PSCs) have attracted immense attention in recent years due to their excellent photoelectric property. [ 1‐8 ] The efficiency and lifetime are the two important indicators for PSCs to move from laboratory to market. [ 9‐14 ] Currently, certified power conversion efficiency (PCE) of PSCs has exceeded 25.0%, which is on par with the industry silicon solar cells.…”

Visible‐Light Photocatalytic and Photo‐bactericidal Activity of Ni‐CuWO4/OTiO2 Composite†

“…[ 27 ] Its merits such as excellent stability, strong photo‐oxidizing capacity, low price and non‐toxicity endue it with the popularity in photocatalysis. [ 28‐31 ] However, all the intrinsic TiO 2 phases can only take advantage of ultraviolet light due to its wide band gap (3.0—3.2 eV), which limits its large‐scale use in the field of photocatalysis and photoelectrocatalysis. [ 32 ] Thus, it is urgent to find an effective approach to broaden the light response range of TiO 2 .…”