Hollow Multishell-Structured TiO<sub>2</sub>/MAPbI<sub>3</sub> Composite Improves Charge Utilization for Visible-Light Photocatalytic Hydrogen Evolution

Han, Wensheng; Wei, Yanze; Wan, Jiawei; Nakagawa, Nobuyoshi; Wang, Dan

doi:10.1021/acs.inorgchem.2c00253

Cited by 19 publications

(8 citation statements)

References 49 publications

(94 reference statements)

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“…The distinct peaks of Cs, Pb, Br, Au, and Ti represented the key elements of CsPbBr 3 -based heterostructures, the same results as the EDX spectrum analysis (FigureS12). The unique peaks of Ti 2p (Figure2e) at 464.1 and 458.4 eV, and O 1s (Figure2f) at 530.1 eV,42 in agreement with the standard peaks of TiO 2 , directly verified the existence of TiO 2 41,42. Notably, in contrast, we also synthesized CsPbBr 3 /Au to understand the formation of CsPbBr 3 /Au/TiO 2 heterostructures (Figures S13−S18).…”

supporting

confidence: 74%

Unraveling the Transformation from Type-II to Z-Scheme in Perovskite-Based Heterostructures for Enhanced Photocatalytic CO₂ Reduction

Song,

Chong,

et al. 2024

J. Am. Chem. Soc.

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The ability to create perovskite-based heterostructures with desirable charge transfer characteristics represents an important endeavor to render a set of perovskite materials and devices with tunable optoelectronic properties. However, due to similar material selection and band alignment in type-II and Zscheme heterostructures, it remains challenging to obtain perovskite-based heterostructures with a favorable electron transfer pathway for photocatalysis. Herein, we report a robust tailoring of effective charge transfer pathway in perovskite-based heterostructures via a type-II to Z-scheme transformation for highly efficient and selective photocatalytic CO 2 reduction. Specifically, CsPbBr 3 /TiO 2 and CsPbBr 3 /Au/TiO 2 heterostructures are synthesized and then investigated by ultrafast spectroscopy. Moreover, taking CsPbBr 3 /TiO 2 and CsPbBr 3 /Au/TiO 2 as examples, operando experiments and theoretical calculations confirm that the type-II heterostructure could be readily transformed into a Zscheme heterostructure through establishing a low-resistance Ohmic contact, which indicates that a fast electron transfer pathway is crucial in Z-scheme construction, as further demonstrated by CsPbBr 3 /Ag/TiO 2 and CsPbBr 3 /MoS 2 heterostructures. In contrast to pristine CsPbBr 3 and CsPbBr 3 /TiO 2 , the CsPbBr 3 /Au/TiO 2 heterostructure exhibits 5.4-and 3.0-fold enhancement of electron consumption rate in photocatalytic CO 2 reduction. DFT calculations and in situ diffuse reflectance infrared Fourier transform spectroscopy unveil that the superior CO selectivity is attributed to the lower energy of *CO desorption than that of hydrogenation to *HCO. This meticulous design sheds light on the modification of perovskite-based multifunctional materials and enlightens conscious optimization of semiconductor-based heterostructures with desirable charge transfer for catalysis and optoelectronic applications.

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confidence: 74%

Unraveling the Transformation from Type-II to Z-Scheme in Perovskite-Based Heterostructures for Enhanced Photocatalytic CO₂ Reduction

Song,

Chong,

et al. 2024

J. Am. Chem. Soc.

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“…The weaker PL intensity of BiOI-TLO (Figure 5c) compared to that of bulk BiOI (at the same weight fraction) suggested the efficient photogenerated electron transfer from the BiOI nanodisk to Bi-TLO. 60,61 Interestingly, the shift of the PL from 550 nm (bulk) to 560 nm (nanodisks) was observed irrespective of the size of the BiOI particles, suggesting the relaxation of the excited electron from CB of Bi-TLO to VB of BiOI. 16 Thus, it is reasonable to deduce the possible electron transfer between BiOI and Bi-TLO.…”

Section: Synthesis Of Bioi-tlo Hybrid By Ionmentioning

confidence: 96%

Efficient p–n Heterojunction Photocatalyst Composed of Bismuth Oxyiodide and Layered Titanate

2022

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Bismuth oxyhalides and layered alkali titanates are promising components to design high-performance hybrid photocatalysts. In this work, a hybrid photocatalyst composed of lepidocrocite-type layered cesium titanate (Cs0.7Ti1.77Li0.23O4, CsTLO) and bismuth oxyiodide (BiOI) was designed rationally based on lattice matching. BiOI formed on the layered titanate by ion exchange of CsTLO with Bi cations and subsequent growth of BiOI nanodisks (6 nm in the thickness and 125 nm in the lateral size) in an aqueous solution of cesium iodide, resulting in the hybrid where BiOI nanodisks were lying flat on the layered titanate and exposed the (001) facet predominantly. The present hybrid exhibited efficient photodegradation of methylene blue (4, 10, and 14 times higher than that of CsTLO, Bi-TLO, and BiOI, respectively), which was ascribed to the efficient charge transfer in the bulk and at the interface assisted by the built-in internal electric fields and the high activity of (001) BiOI for direct oxidation of the pollutant.

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“…Furthermore, the construction of hollow structures can mitigate volume effects, thus enhancing the cyclic stability of the structure. [36,37] In this study, the FeCo-MOF-74 precursor was synthesized using a simple hydrothermal method, followed by a phosphorization process through calcination to produce a hollow spherical FeCo-P catalyst composed of nanosheets. The resulting hollow structure possesses a larger specific surface area and plenty of accessible active sites.…”

Section: Introductionmentioning

confidence: 99%

Hollow Spherical Heterostructured FeCo‐P Catalysts Derived from MOF‐74 for Efficient Overall Water Splitting

Jiang,

Zhao,

et al. 2023

Advanced Science

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The design of catalysts with tunable active sites in heterogeneous interface structures is crucial for addressing challenges in the water‐splitting process. Herein, a hollow spherical heterostructure FeCo‐P is successfully prepared by hydrothermal and phosphorization methods. This hollow structure, along with the heterogeneous interface between Co2P and FeP, not only facilitates the exposure of more active sites, but also increases the contact area between the catalyst and the electrolyte, as well as shortens the distance for mass/electron transfer. This enhancement promotes electron transfer to facilitate water decomposition. FeCo‐P exhibits excellent hydrogen evolution (HER) and oxygen evolution (OER) performance when reaching @ 10 mA cm−2 in 1 mol L−1 KOH, with overpotentials of 131/240 mV for HER/OER. Furthermore, when FeCo‐P is used as both the cathode and anode for overall water splitting (OWS), it only requires low voltages of 1.49, 1.55, and 1.57 V to achieve CDs of 10, 100, and 300 mA cm−2, respectively. Density functional theory calculations indicate that constructing a Co2P and FeP heterogeneous interface with good lattice matching can facilitate electron redistribution, thereby enhancing the electrocatalytic performance of OWS. This work opens up new possibilities for the rational design of efficient water electrolysis catalysts derived from MOFs.

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Hollow Multishell-Structured TiO₂/MAPbI₃ Composite Improves Charge Utilization for Visible-Light Photocatalytic Hydrogen Evolution

Cited by 19 publications

References 49 publications

Unraveling the Transformation from Type-II to Z-Scheme in Perovskite-Based Heterostructures for Enhanced Photocatalytic CO₂ Reduction

Unraveling the Transformation from Type-II to Z-Scheme in Perovskite-Based Heterostructures for Enhanced Photocatalytic CO₂ Reduction

Efficient p–n Heterojunction Photocatalyst Composed of Bismuth Oxyiodide and Layered Titanate

Hollow Spherical Heterostructured FeCo‐P Catalysts Derived from MOF‐74 for Efficient Overall Water Splitting

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Hollow Multishell-Structured TiO2/MAPbI3 Composite Improves Charge Utilization for Visible-Light Photocatalytic Hydrogen Evolution

Cited by 19 publications

References 49 publications

Unraveling the Transformation from Type-II to Z-Scheme in Perovskite-Based Heterostructures for Enhanced Photocatalytic CO2 Reduction

Unraveling the Transformation from Type-II to Z-Scheme in Perovskite-Based Heterostructures for Enhanced Photocatalytic CO2 Reduction

Efficient p–n Heterojunction Photocatalyst Composed of Bismuth Oxyiodide and Layered Titanate

Hollow Spherical Heterostructured FeCo‐P Catalysts Derived from MOF‐74 for Efficient Overall Water Splitting

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Product

Resources

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Hollow Multishell-Structured TiO₂/MAPbI₃ Composite Improves Charge Utilization for Visible-Light Photocatalytic Hydrogen Evolution

Unraveling the Transformation from Type-II to Z-Scheme in Perovskite-Based Heterostructures for Enhanced Photocatalytic CO₂ Reduction

Unraveling the Transformation from Type-II to Z-Scheme in Perovskite-Based Heterostructures for Enhanced Photocatalytic CO₂ Reduction