Enhanced Solar-Driven Gaseous CO₂ Conversion by CsPbBr₃ Nanocrystal/Pd Nanosheet Schottky-Junction Photocatalyst

Abstract

In this report, a novel zero-dimensional CsPbBr 3 nanocrystal (CsPbBr 3 NC)/two-dimensional Pd nanosheet (Pd NS) composite photocatalyst is prepared to afford efficient and stable photocatalytic gaseous CO 2 reduction in the presence of H 2 O vapor under visible light illumination. Pd NS herein acts as an electron reservoir to quickly separate the electron−hole pairs in CsPbBr 3 NC through a Schottky contact, and provides an ideal site for CO 2 reduction reactions. A highest electron consumption rate of 33.79 μmol g −1 h −1 is achieved by the CsPbBr 3 NC/Pd NS composite, which corresponds to a 2.43-fold enhancement over pristine CsPbBr 3 NC (9.86 μmol g −1 h −1 ), thus providing a practical and universal solution for the halide perovskite materials to boost the photocatalytic performance through semiconductor/metal design.

C(sp3)–H Bond Activation by Perovskite Solar Photocatalyst Cell

“…The generation of BA can be explained by the direct reaction of the Tol radicals with free O 2 dissolved in Tol to generate BA, which can be further oxidized to produce the aldehydes as well. 16,17 The highly selective and efficient C(sp 3 )−H bond oxidation via our rationally designed perovskite solar photocatalytic cell is further tested for the activation of cycloalkanes, using again O 2 under simulated solar illumination (see Table 1). Our champion 5% NiO x /FAPbBr 3 /TiO 2 displays a high activity in the selective oxidation of cyclohexane and cyclooctane, with 89 and 138 μmol h −1 g −1 cyclohexanone and cyclooctenone, respectively, and with >99% selectivity.…”

In Situ Photosynthesis of an MAPbI3/CoP Hybrid Heterojunction for Efficient Photocatalytic Hydrogen Evolution

“…In comparison, halide perovskite nanocrystals have large specific surface area and short carrier diffusion length, which may exhibit large potential in the field of photocatalysis application. [ 9,35–48 ] Encouragingly, in 2017, we for the first time reported a photocatalytic CO 2 reduction reaction by CsPbBr 3 QDs/graphene oxide composite in the non‐aqueous ethyl acetate reaction media. [ 9 ] Subsequently, various lead‐free perovskite nanocrystals including Cs 2 AgBiBr 6 , [ 19 ] Cs 2 PdBr 6 , [ 39 ] and Cs 4 CuSb 2 Cl 12 [ 40 ] with tunable band gap were synthesized to perform photocatalytic CO 2 reduction/photoelectrochemical cell application.…”

“…[ 9 ] Subsequently, various lead‐free perovskite nanocrystals including Cs 2 AgBiBr 6 , [ 19 ] Cs 2 PdBr 6 , [ 39 ] and Cs 4 CuSb 2 Cl 12 [ 40 ] with tunable band gap were synthesized to perform photocatalytic CO 2 reduction/photoelectrochemical cell application. Furthermore, various perovskite nanocrystal‐based composite materials such as CsPbBr 3 @metal oxides, [ 41 ] CsPbBr 3 /Pd, [ 42 ] CsPbBr 3 @metal‐organic frameworks, [ 43,44 ] Cs 2 SnI 6 /SnS 2 [ 45 ] as well as Fe 2 O 3 /RGO/CsPbBr 3 Z‐scheme heterojunction [ 46 ] have been designed for improving photogenerated charge carrier separation and hence enhancing the photocatalytic performance.…”

“…In addition to regulating the size or the composition of catalysts, the introduction of co‐catalysts is an another effective strategy to improve the photocatalytic performance, which can work as electron sinks and provides effective proton‐reduction reaction sites. [ 42,47–53 ] As a typical example, cobalt phosphide (CoP) is an ideal candidate for constructing advanced hybrid catalysts due to its outstanding intrinsic activity and superior conductivity; and exciting progress has been obtained in the field of electrocatalytic H 2 evolution. [ 54–61 ] Although the pristine CoP exhibits negligible photocatalytic activity for H 2 evolution, [ 62 ] the integration of CoP as co‐catalyst can help accelerate the photoelectron transfer and separation, and also reduce the reaction energy barrier effectively.…”

Recent Progress and Development in Inorganic Halide Perovskite Quantum Dots for Photoelectrochemical Applications

“…The photocatalytic CO 2 reduction efficiency is another key parameter affecting the ultimate practical application. To improve the photocatalytic CO 2 reduction efficiency, the construction of heterojunction structure has been proven as an effective approach, benefiting from the broadened light absorption range, the accelerated charge separation and the suppressed charge recombination induced by the heterostructure . Similarly, the photocatalytic CO 2 reduction activity of IHPQDs can be also improved by constructing heterostructure.…”