Morphology- and size-dependent FAPbBr3/WO3 Z-scheme photocatalysts for the controllable photo-oxidation of benzyl alcohol

CsPbBr3 perovskite quantum dots as a visible light photocatalyst for cyclisation of diamines and amino alcohols: an efficient approach to synthesize imidazolidines, fused-imidazolidines and oxazolidines

“…Literature reports show that the halide-rich surface of metal halide CsPbX 3 NCs is exceptionally stable compared to those prepared under stoichiometric conditions. 43,44,50,53,54 In the presence of oleylamine (OLAM) at high temperature, DBI generates HBr which in turn reacts with Pb(II) and Cs(I) ions in situ to form the QDs. 45 The emission maxima of the QDs can be tuned by changing the reaction temperature (Fig.…”

“…The conventional transition metal 23 and organic dye 24 based visible light-induced photo-redox catalysis suffers from major pitfalls such as: the use of expensive metals, narrow absorption windows, fixed bandgaps, inferior charge separation capacity, mediocre product selectivity, poor airtolerance, non-reusability, etc. In contrast, CsPbBr 3 QDs exhibit superior photophysical properties such as excellent photon absorption/emission ability, [31][32][33] tunable band-edge alignment, 34 broad absorption window, 35 long lifetime of photoexcited states, 36 and robust separation/transfer of electron-hole pairs 37,38 which have been widely exploited in solar cells, 39,40 light-emitting diodes (LEDs), 41 detectors, 42 lasers, 32 photocatalysts, [43][44][45][46][47][48][49] etc. In this work, we report facile sp 3 C-H bond functionalisation of N-Me (alkyl) groups using a CsPbBr 3 QD based visible light photocatalyst (Fig.…”

Controllable fabrication of a Cs2AgBiBr6 nanocrystal/mesoporous black TiO2 hollow sphere composite for photocatalytic benzyl alcohol oxidation

“…21–24 Among them, lead halide chalcogenide nanocrystals show a remarkable performance due to their tunable band gap, good absorption of sunlight and good charge separation. 25–27 Huang et al prepared an FAPbBr 3 /TiO 2 hybrid photocatalyst available for the efficient and selective photocatalytic oxidation of benzylic alcohols, and obtained 63% conversion and 99% selectivity. Wang et al prepared Z-scheme heterojunction photocatalysts composed of FAPbBr 3 /WO 3 , and obtained 65.71% conversion and 90% selectivity.…”

“…[21][22][23][24] Among them, lead halide chalcogenide nanocrystals show a remarkable performance due to their tunable band gap, good absorption of sunlight and good charge separation. [25][26][27] However, the application of lead halide chalcogenides is limited due to the toxicity of lead, which is harmful for the environment, and they are unstable during the oxidation process. A potential perovskite candidate is needed without the Pb element, and with signicant photoelectric properties similar to those of lead halide chalcogenides.…”

CsPbBr3/Polyoxometalate Composites for Selective Photocatalytic Oxidation of Benzyl Alcohol

“…Metal halide perovskites, as emerging semiconductor materials, have received substantial attention in the field of photocatalysis, including hydrogen evolution, − CO 2 reduction, − C­(sp3)-H bond activation, − and organic transformation, − due to their high extinction coefficients and superior charge-transfer properties. − To date, some metal halide perovskite-based composites were reported to the selective oxidation of benzyl alcohol, such as CsPbBr 3 /TiO 2 , CsPbX 3 /W 18 O 49 , FAPbBr 3 /WO 3 , and FAPbBr 3 /Bi 2 WO 6 , which exhibited good photocatalytic activities. Inspired by the above research background and considering that the selective oxidation of benzyl alcohol is a two-electron redox process accompanied by the release of two protons, it is reasonable to construct the perovskite/POM composites by taking advantage of the excellent visible light-responsive ability of halide perovskites and the distinctive redox behavior acting as the shuttle of electrons and protons to achieve the efficient selective oxidation of benzyl alcohol.…”