Bi5+, Bi(3−x)+, and Oxygen Vacancy Induced BiOClxI1−x Solid Solution toward Promoting Visible‐Light Driven Photocatalytic Activity

Zhang, Guoqiang; Cai, Li‐Zhen; Zhang, Yanfeng; Wei, Yu

doi:10.1002/chem.201706164

Cited by 133 publications

(38 citation statements)

References 66 publications

(151 reference statements)

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“…The XRD patterns confirm the achievement of the desired BiOI stoichiometry, with tetragonal phase (PDF# 10-0445). This phase has been already reported by several groups but using mainly Bi(NO 3 ) 3 as bismuth source [5,[14][15][16][17], [25][26][27][28][29][30][31][32], most of them by hydrothermal methods. Therefore, the same crystalline phase can be obtained regardless of the used precursor; in our case, bismuth acetate (BiAc) and subsalicylate (BiSs) by a simpler hydrothermal route.…”

Section: Resultssupporting

confidence: 55%

Alternative Bi precursor effects on the structural, optical, morphological and photocatalytic properties of BiOI nanostructures

Florez-Rios

Santana-Aranda

Quiñones-Galván

et al. 2020

Mater. Res. Express

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BiOI nanostructures were synthetized through a hydrothermal process using either bismuth acetate or subsalicylate as Bi precursor. Regardless of the used Bi source, the same crystalline structure of BiOI was obtained; nevertheless, the nature of the Bi precursor had an evident impact in the color appearance of the obtained sample. Another notable difference was observed in the resulting morphology, where ∼1.6 μm flowerand dandelion-like shapes were obtained for acetate and subsalicylate, respectively; both structures assembled by around 30 nm thick nanoflakes with rounded and straight edge, respectively. UV-vis diffuse reflectance shows an energy gap around 1.8 eV. Raman spectroscopy confirms also the tetragonal phase of BiOI. The photocatalytic activity was evaluated through degradation of methyl orange dye using visible and UV light sources, comparing results with P25 TiO 2 . Both BiOI nanostructures presented an improvement of photocatalytic activity when irradiated with visible light, having the best photoactivity the sample synthetized with bismuth acetate.

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Section: Resultssupporting

confidence: 55%

Alternative Bi precursor effects on the structural, optical, morphological and photocatalytic properties of BiOI nanostructures

Florez-Rios

Santana-Aranda

Quiñones-Galván

et al. 2020

Mater. Res. Express

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“…However, the peaks of Bi 4f and I 3d in BiOI nanosheets shifted slightly compared with that of BiOI nanoplates, indicating the formation of the oxygen vacancies . These result was similar to the previous one . Obvious difference in the high resolution XPS of O 1s was observed between BiOI nanoplates and BiOI nanosheets, as shown in Figure 2c.…”

Section: Positron Lifetime Parameters Of Bioi Nanoplates and Bioi Nansupporting

confidence: 84%

Enhancement of Solar‐Driven Photocatalytic Activity of BiOI Nanosheets through Predominant Exposed High Energy Facets and Vacancy Engineering

Bai

Sun

Zhu

et al. 2020

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electronic structure, charge transfer, and separation efficiency ultimately result in distinct catalytic abilities. [3,4] The photocatalytic performance of single-crystalline Ag 3 PO 4 with only (110) facets exhibited much higher activities than Ag 3 PO 4 with (100) facets because the surface energy of (110) facets (1.31 J m −2 ) is higher than that of (100) facets (1.12 J m −2 ). [5] Furthermore, it was easily to form oxygen vacancies on the (110) facets of Ag 3 PO 4 than on the (110) facets and the abundant catalytically active sites enhance the photocatalytic activity. [5] Thus, crystal facet engineering was usually identified as a versatile strategy to prepare highly active photocatalysts by tuning crystal growth process. [6,7] Moreover, introducing oxygen defects could further improve the photocatalytic performance of photocatalysts with the high reactivity dominant exposed facets. Xue et al. reported that ZnO-6, added by 6 mmol zinc powder, exhibited excellent gas response and selectivity, which ascribed to the exposed (0001) crystal facet and the formation of abundant electron donor aroused by zinc interstitial and oxygen vacancy surface defects. [8] The introduction of vacancy/defect is efficient and promi sing to Engineer photocatalysts with the enhanced photocatalytic efficiency. [9] The change of electronic structures of catalysts with vacancy/defect improved their catalytic activity greatly. [9,10] The V Bi ″′V O •• V Bi ″′ vacancy enhanced the solar-driven photocatalytic activity of ultrathin BiOCl nanosheets significantly. [11] BiPO 4−x with high-content oxygen vacancies exhibited excellent photocatalytic performance because the surface oxygen vacancies broadened its the valence band and narrowed its bandgap compared to that of pure BiPO 4 . [12] Because of their high surface to volume ratio, nanomaterials generate much more vacancies inevitably. [13] Therefore, the exposed atoms on the facet surface of ultrathin 2D nanosheet materials are easy to escape and form vacancies and then improved its catalytic efficiency. [11,14,15] Bismuth oxyhalides (BiOX, X = Cl, Br, and I) are a class of ternary compounds and their photocatalytic potential makes them promising layered semiconductor photocatalysts. [16][17][18][19][20] Among layered BiOX materials, BiOI has narrow bandgap (about 1.7-1.9 eV), and therefore high absorption coefficient under visible light. [21] In addition, as a V-VI-VII ternary compound with a layer structure characterized by [Bi 2 O 2 ] 2+ slabs interleaved by halogen atoms, BiOI favors charge separationThe increasing application of exposed high energy facet is an effective strategy to improve the photocatalytic performance of photocatalysts because the vacancies are beneficial to photocatalytic reaction. Vacancy dominates numerous distinct properties of semiconductor materials and thus plays a conclusive role in the photocatalysis applications. In this work, two kinds of BiOI nanomaterials with different vacancies are synthesized via a facile solvothermal method. The positron annihilat...

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“…Bi 4f spectrum (Figure 3c) exhibits two main peaks around 164.9 and 159.6 eV that attribute to Bi 3+ . [ 24 ] Compared with those of BF, the Bi 4f peaks of BFO shift towards higher binding energies, implying that the coordination conditions of Bi 3+ may be changed. [ 25 ] No obvious change of F 1s spectra is observed for the two samples (Figure S8, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Initiating a Room‐Temperature Rechargeable Aqueous Fluoride‐Ion Battery with Long Lifespan through a Rational Buffering Phase Design

Tang

Zhu

et al. 2021

Advanced Energy Materials

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Previously reported fluoride‐ion batteries (FIBs) can only work at high temperatures (>150 °C) with solid electrolytes or organic electrolytes. Aqueous FIB has barely been reported due to the unstable F– electrochemistry in aqueous electrolytes. In addition, the electrode materials commonly suffer from serious and adverse volume expansion during the conversion reaction. Herein, a stable aqueous F– electrochemistry is realized by a rational buffering phase design in which stagger distribution of BiF3 and Bi7F11O5 phases is achieved. The enhanced F– electrochemistry is systematically studied and suggests that the Bi7F11O5 phase plays a vital role in the stability and reversibility of the electrode due to its lower volume change and higher electronic conductivity. Pulverization and dissolution of active species issues are also suppressed. As a result, the assembled battery delivers excellent cycling stability, high reversibility, and superior rate capability, which is far better than conventional solid fluoride shuttle batteries. Mechanism studies demonstrate that the capacity comes from reversible conversion between Bi3+ and Bi0 with an intermediate phase of Bi7F11O5. This work initiates room‐temperature FIBs with aqueous electrolytes and provides a good cycling lifespan, which pave the way to a more practical fluoride ion storage system.

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Bi⁵⁺, Bi^(3−x)+, and Oxygen Vacancy Induced BiOCl_xI_1−x Solid Solution toward Promoting Visible‐Light Driven Photocatalytic Activity

Cited by 133 publications

References 66 publications

Alternative Bi precursor effects on the structural, optical, morphological and photocatalytic properties of BiOI nanostructures

Alternative Bi precursor effects on the structural, optical, morphological and photocatalytic properties of BiOI nanostructures

Enhancement of Solar‐Driven Photocatalytic Activity of BiOI Nanosheets through Predominant Exposed High Energy Facets and Vacancy Engineering

Initiating a Room‐Temperature Rechargeable Aqueous Fluoride‐Ion Battery with Long Lifespan through a Rational Buffering Phase Design

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