Boosting the photocatalytic activity of BiOX under solar light <i>via</i> selective crystal facet growth

Yang, Jun; Xie, Taiping; Zhu, Quanxi; Wang, Jiankang; Xu, Longjun; Liu, Chenglun

doi:10.1039/c9tc05752h

Cited by 77 publications

(32 citation statements)

References 43 publications

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“…Tailoring of exposed facet should reduce the energy of high energy facet, − where the use of a capping agent or structure directing agent is common bottom-up route. − Although organic surfactants can perfectly accomplish this aim, most of them are difficult to be completely removed from the catalyst surface, which is a hindrance to the reaction site. , By contrast, inorganic ions will be easily removed from the surface, but some cations with a lower valence state may enter the crystal, like Na + . − Li et al have reported an excellent 18-faceted BiOCl flake with ternary facet cascade charge flow via a prolonged synthesis time strategy . However, this is a much more energy-intensive process.…”

Section: Introductionmentioning

confidence: 99%

Boosting the Photocarrier Separation of PbMoO₄ through Facet Collaboration

Zheng

Jin

Shi

et al. 2021

ACS Appl. Energy Mater.

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Boosting photocarrier separation efficiency is a critical step for the catalyst itself or composites based on such catalysts. The use of the reaction raw material to accomplish crystal facet control and ratio optimization is an important and challenging subject in the field of facet engineering, as the activity of the photocatalyst can be improved without introducing impurities. Here, we report the evolution of PbMoO 4 from a lamellar to a 26-faceted polyhedron via a wet chemical method. The redox crystal facet ratio does not change the light absorption capacity, but the photocarrier separation efficiency is improved depending on the ratio of oxidized (111)/reduced (001) surfaces. Based on the exposed facet band structure, electrostatic potential, and EDX of photodeposited species, adjacent (101) only contributes to the transport and separation of photogenerated electrons (e − ) from ( 111) to (001), while photogenerated holes (h + ) respectively migrate from ( 101) and ( 001) to ( 111) under the different valence band position and electrostatic potential. The collaboration of three crystal planes with a certain ratio maximizes the separation of carriers and produces dramatic changes, such as from the inability of H 2 O oxidation to the ability of O 2 evolution (18.78 μmol/(g•h)). In addition, there are more effective h + that can simultaneously participate in the oxidation of other substances during the production of reactive oxygen species (ROS). So, a larger ratio of (111)/(001) combined with a harmonized (101) crystal surface makes a PbMoO 4 polyhedron that has more excellent photocarrier separation ability and versatile oxidation capacity.

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Section: Introductionmentioning

confidence: 99%

Boosting the Photocarrier Separation of PbMoO₄ through Facet Collaboration

Zheng

Jin

Shi

et al. 2021

ACS Appl. Energy Mater.

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“…Furthermore, the surface lattice oxygen atoms in the metallic oxide could directly take part in the oxidation process [12][13][14][15] . Compared with the broken of O-O bond in O2, O-metal bond could be easier to dissociate 4,[16][17][18][19][20] . Hence, it provides a possibility that surface lattice oxygen might be more beneficial for the occurrence of oxidation reaction compared with O2.…”

Section: Introductionmentioning

confidence: 99%

Selective Exposure of BiOI Oxygen-Rich {110} Facet Induced by BN Nanosheets for Enhanced Photocatalytic Oxidation Performance

郑倩¹,

曹玥晗²,

黄南建³

et al. 2020

Acta Physico Chimica Sinica

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Photocatalytic oxidation is a promising technology for governing emission of environmental pollutants and managing energy crisis. Typically, the photocatalytic performance of photocatalysts is highly dependent on the type of exposed crystal surfaces. As a semiconductor oxide photocatalyst, the different exposed crystal surfaces of bismuth oxyiodide (BiOI) exhibit different photocatalytic oxidation performances. In this study, we chose BiOI as the model material and provided a novel method to improve the photocatalytic oxidation performance by regulating the main exposed crystal facets. Using boron nitride (BN) nanosheets as the templates, two-dimensional/two-dimensional (2D/2D) BiOI/BN nanocompounds were fabricated via an in situ growth method. Owing to the electrostatic interaction, the positively charged BiOI {001} facets prefer to contact the negatively charged BN {001} facet, thus inducing the exposure of BiOI {110} facets. This was identified via X-ray diffraction and transmission electron microscopy analyses. Compared with BiOI {001} facets, there were more lattice oxygen atoms in the BiOI {110} facets. Thus, the exposure of BiOI {110} facets would promote more surface lattice oxygen atoms exposed on the surface of BiOI, which was confirmed by X-ray photoelectron spectroscopy and density functional theory calculations. To evaluate the photocatalytic oxidation performance of BiOI/BN, the photocatalytic NO oxidation reaction was tested under visible light irradiation (λ > 420 nm). Among all the nanocompounds, the BiOI/BN-1.0:1.4 nanocompound exhibited the best NO oxidation ratio of 44.2%, which was almost 30 times higher than that of pristine BiOI (1.4%). The enhanced photocatalytic activity could be attributed to the following two aspects. One, the successful combination of BN effectively promoted the separation of photogenerated carriers, which was identified by steady-state and time-resolved fluorescence spectra, transient photocurrent responses, and electrochemical impedance spectra. Two, benefiting from the introduction of BN nanosheets, BiOI tends to mainly expose the oxygen-rich {110} facets. As a result, the content of O on the BiOI surface increased from 38.3% to 46.6%. Thus, NO preferred to adsorb on the {110} facets of BiOI nanosheets, which was confirmed by theoretical and experimental results. More importantly, the adsorbed NO spontaneously combined with the lattice oxygen atom of the BiOI (110) surface to form nitrogen dioxide (NO2). These findings can provide a novel strategy to tune exposed oxygen-rich facets by constructing 2D/2D photocatalysts for ensuring efficient photocatalytic oxidation performance.

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“…With respect to the bulk sample, catalysts with nanostructures generally exhibit increased photocatalytic activities because of the quantized sizes and, consequently, additional active sites. [ 184,185 ] As the bandgap decreases, the optimal light absorption range of the BiOX family gradually transforms from UV to the visible light region. Xiong et al.…”

Section: Pb‐free Ns2‐cation‐containing Semiconductors For Optoelectronic Applicationsmentioning

confidence: 99%

Alternative Lone‐Pair ns²‐Cation‐Based Semiconductors beyond Lead Halide Perovskites for Optoelectronic Applications

Luo

Wang

et al. 2021

Advanced Materials

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Lead halide perovskites have emerged in the last decade as advantageous high‐performance optoelectronic semiconductors, and have undergone rapid development for diverse applications such as solar cells, light‐emitting diodes , and photodetectors. While material instability and lead toxicity are still major concerns hindering their commercialization, they offer promising prospects and design principles for developing promising optoelectronic materials. The distinguished optoelectronic properties of lead halide perovskites stem from the Pb2+ cation with a lone‐pair 6s2 electronic configuration embedded in a mixed covalent–ionic bonding lattice. Herein, we summarize alternative Pb‐free semiconductors containing lone‐pair ns2 cations, intending to offer insights for developing potential optoelectronic materials other than lead halide perovskites. We start with the physical underpinning of how the ns2 cations within the material lattice allow for superior optoelectronic properties. We then review the emerging Pb‐free semiconductors containing ns2 cations in terms of structural dimensionality, which is crucial for optoelectronic performance. For each category of materials, the research progresses on crystal structures, electronic/optical properties, device applications, and recent efforts for performance enhancements are overviewed. Finally, the issues hindering the further developments of studied materials are surveyed along with possible strategies to overcome them, which also provides an outlook on the future research in this field.

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Boosting the photocatalytic activity of BiOX under solar light via selective crystal facet growth

Abstract: The selective crystal facet growth of BiOX (X = Cl, Br, I) is very significant since each facet possesses different physicochemical properties.

Cited by 77 publications

References 43 publications

Boosting the Photocarrier Separation of PbMoO₄ through Facet Collaboration

Boosting the Photocarrier Separation of PbMoO₄ through Facet Collaboration

Selective Exposure of BiOI Oxygen-Rich {110} Facet Induced by BN Nanosheets for Enhanced Photocatalytic Oxidation Performance

Alternative Lone‐Pair ns²‐Cation‐Based Semiconductors beyond Lead Halide Perovskites for Optoelectronic Applications

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Boosting the photocatalytic activity of BiOX under solar light via selective crystal facet growth

Abstract: The selective crystal facet growth of BiOX (X = Cl, Br, I) is very significant since each facet possesses different physicochemical properties.

Cited by 77 publications

References 43 publications

Boosting the Photocarrier Separation of PbMoO4 through Facet Collaboration

Boosting the Photocarrier Separation of PbMoO4 through Facet Collaboration

Selective Exposure of BiOI Oxygen-Rich {110} Facet Induced by BN Nanosheets for Enhanced Photocatalytic Oxidation Performance

Alternative Lone‐Pair ns2‐Cation‐Based Semiconductors beyond Lead Halide Perovskites for Optoelectronic Applications

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Product

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Boosting the Photocarrier Separation of PbMoO₄ through Facet Collaboration

Boosting the Photocarrier Separation of PbMoO₄ through Facet Collaboration

Alternative Lone‐Pair ns²‐Cation‐Based Semiconductors beyond Lead Halide Perovskites for Optoelectronic Applications