Highly crystalline lead-free Cs3Sb2Br9 perovskite microcrystals enable efficient and selective photocatalytic oxidation of benzyl alcohol

Wu, Daofu; Sang, Wei; Huo, Benjun; Wang, Jimei; Wang, Xiaoyan; Chen, Cheng; Huang, Qiang; Tang, Xiaosheng

doi:10.1016/j.jcat.2022.02.023

Cited by 26 publications

(21 citation statements)

References 31 publications

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“…2.7 eV) and Cs 3 Sb 2 Br 9 ( E g = ca. 2.4 eV), , the 4d orbitals of Ag participate in the valence band, thus narrowing the band gap (Cs 2 AgBiBr 6 E g = ca. 2.1 eV) and increasing the electronic dimensionality, providing broader visible light utilization and lower exciton binding energy. − However, a narrower band gap is still required for highly efficient visible light photocatalysis.…”

Section: Introductionmentioning

confidence: 99%

“…However, Sn- and Ge-based perovskites are restricted by the problem of poor stability due to the rapid oxidation of Sn 2+ and Ge 2+ . Hence, replacing Pb 2+ with trivalent low-toxic metals to form an A 3 B 2 X 9 stoichiometry perovskite, particularly Cs 3 Bi 2 Br 9 and Cs 3 Sb 2 Br 9 , has been widely reported to produce good candidates for photocatalysis, including recent reports on photocatalytic C(sp 3 )–H activation. − However, A 3 B 2 X 9 perovskites exhibit low structural dimensionality to maintain charge neutrality, leading to unfavorable properties such as a relatively wide band gap and large charge carrier effective mass, which restrict their effectiveness in photocatalysis …”

Section: Introductionmentioning

confidence: 99%

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Sb-Substituted Cs₂AgBiBr₆/g-C₃N₄ Composite for Photocatalytic C(sp³)–H Bond Activation in Toluene

Mai

Cox

et al. 2023

Chem. Mater.

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The visible-light-driven photocatalytic selective aromatic C(sp3)–H bond activation utilizing all-inorganic halide perovskites as photocatalysts is a sustainable and green approach to obtain value-added oxygenates. These catalysts, however, are restricted by low activity due to undesirable charge recombination and inefficient light absorption. In this research, we developed a Sb-substituted Cs2AgBiBr6/g-C3N4 composite to enhance the photocatalytic performance for toluene oxidation. The introduction of the Sb dopant extended the visible light absorbance to 650 nm, and the formation of the heterointerface and the staggered band structure between the two components substantially suppressed the charge recombination. This composite features a 2.3-fold and 72.5-fold higher visible light photocatalytic toluene oxidation rate toward benzaldehyde than that of either Sb-substituted Cs2AgBiBr6 or g-C3N4 alone, respectively, with a high selectivity of over 96%. The development of all-inorganic lead-free halide perovskite-based heterostructures for visible light photocatalytic organic transformations is expected to have wide-reaching application.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sb-Substituted Cs₂AgBiBr₆/g-C₃N₄ Composite for Photocatalytic C(sp³)–H Bond Activation in Toluene

Mai

Cox

et al. 2023

Chem. Mater.

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“…Unlike oxide perovskite photocatalysts, which generally require high sintering temperatures, LFHPs can be prepared via a variety of solution synthesis approaches at relatively low temperature (e.g., room temperature), because of their low formation and decomposition energies. Currently, several typical methods, including conventional hydrothermal (or solvothermal) methods, ,,, cooling crystallization methods, − antisolvent precipitation methods, − and hot-injection methods, − have been adopted for preparing LFHP photocatalysts. However, during the preparation, toxic organic solvents (e.g., dimethylformamide (DMF) and toluene) and harmful hydrohalic acids are used.…”

Section: Synthesis Structure and Photophysical Properties Of Lfhp Pho...mentioning

confidence: 99%

Recent Advances in Lead-Free Halide Perovskites for Photocatalysis

Cheng

Han

Chen

2022

ACS Materials Lett.

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Metal halide perovskites have attracted extensive attention in the field of photocatalysis, because of their excellent photophysical properties, including high optical absorption coefficients, tunable band structures, and long carrier diffusion lengths. The application prospect of conventional lead-based halide perovskites is restricted by their toxicity and instability issues. Therefore, it is imperative to develop environmentally friendly and stable lead-free halide perovskites (LFHPs) for photocatalysis. In recent years, the rapid development of LFHPs has provided new opportunities for their photocatalytic applications, ranging from solar-to-chemical energy conversion to photocatalytic organic reactions. In this Review, we summarize the recent progresses of LFHPs for photocatalytic applications, with an emphasis on the strategies available to improve their performance and stability. Furthermore, we present an outlook on future development directions and challenges in this emerging field.

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“…Sb 3+ possesses a lone pair of 5s 2 electrons and is one of the replacement elements for Pb. − Compared to the Pb-based MAPbI 3 , Cs 3 Sb 2 I 9 has higher environmental stability and a more moderate indirect band gap (2.05 eV) . Wu et al synthesized highly crystalline Cs 3 Sb 2 Br 9 via a simple antisolvent method in 2022 and applied it to the photocatalytic oxidation of benzyl alcohol. The photocatalytic conversion was significantly greater than that of LHPs of CsPbBr 3 .…”

Section: Various Lfhpsmentioning

confidence: 99%

Recent Progress and Perspectives on Nonlead Halide Perovskites in Photocatalytic Applications

Chen

Gao

et al. 2022

Energy Fuels

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Photocatalysis is a technique and one of the prospective solar-energy-conversion strategies for addressing the current energy and environmental problems. Developing a powerful photocatalyst is the key to achieving a supernal visiblelight-induced catalytic activity. Lead halide perovskites have been broadly utilized in photocatalysis with excellent performance; however, their practical applications and commercial values are extremely limited by intrinsic lead toxicity. Therefore, it is urgent and reasonable to substitute Pb with other harmless elements in halide perovskites, which has recently boomed as an attractive research field. The substitute candidates are Sn (same main group as Pb), Bi (same period as Pb), Sb, and other transition metal elements. In this review, we first give a systematic introduction to the structure and characteristics of nonlead halide perovskites. The following section provides a general description of the preparation methods and photocatalytic performance for nonlead halide perovskites. Finally, the prospects and challenges of nonlead halide perovskites in the photocatalytic field are discussed, which may facilitate and guide the future investigation of this exciting topic.

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Highly crystalline lead-free Cs3Sb2Br9 perovskite microcrystals enable efficient and selective photocatalytic oxidation of benzyl alcohol

Cited by 26 publications

References 31 publications

Sb-Substituted Cs₂AgBiBr₆/g-C₃N₄ Composite for Photocatalytic C(sp³)–H Bond Activation in Toluene

Sb-Substituted Cs₂AgBiBr₆/g-C₃N₄ Composite for Photocatalytic C(sp³)–H Bond Activation in Toluene

Recent Advances in Lead-Free Halide Perovskites for Photocatalysis

Recent Progress and Perspectives on Nonlead Halide Perovskites in Photocatalytic Applications

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Highly crystalline lead-free Cs3Sb2Br9 perovskite microcrystals enable efficient and selective photocatalytic oxidation of benzyl alcohol

Cited by 26 publications

References 31 publications

Sb-Substituted Cs2AgBiBr6/g-C3N4 Composite for Photocatalytic C(sp3)–H Bond Activation in Toluene

Sb-Substituted Cs2AgBiBr6/g-C3N4 Composite for Photocatalytic C(sp3)–H Bond Activation in Toluene

Recent Advances in Lead-Free Halide Perovskites for Photocatalysis

Recent Progress and Perspectives on Nonlead Halide Perovskites in Photocatalytic Applications

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Sb-Substituted Cs₂AgBiBr₆/g-C₃N₄ Composite for Photocatalytic C(sp³)–H Bond Activation in Toluene

Sb-Substituted Cs₂AgBiBr₆/g-C₃N₄ Composite for Photocatalytic C(sp³)–H Bond Activation in Toluene