JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Hongxia Liu,Hui Mei,Shiping Li,Longkai Pan,Zhipeng Jin,Gangqiang Zhu,Laifei Cheng,Litong Zhang
Bismuth titanate (Bi 12 TiO 20 ) with unique sillenite structure has been shown to be an excellent photocatalyst for environmental remediation. However, the narrow light-responsive range and rapid recombination of photoinduced electrons-holes limit the photocatalytic performance of Bi 12 TiO 20 . To overcome the limitations, a practical and feasible way is to fabricate heterojunctions by combining Bi 12 TiO 20 with suitable photocatalysts. Here, using a facile chemical precipitation method, a novel and hierarchical core–shell structure of n-Bi 12 TiO 20 @p-BiOI (BTO@BiOI) heterojunction was rationally designed and synthesized by loading BiOI nanosheets on BTO nanofibers. The constructed BTO@BiOI composites exhibited significant charge transfer ability due to the synergistic effects of the built-in electric field between BTO and BiOI as well as close interfacial contacts. In addition, the narrow bandgap characteristics of the BiOI led to wide light absorption ranges. Therefore, the BTO@BiOI heterojunction exhibited an improved photocatalytic performance under visible light irradiation. The NO removal efficiency of optimal BTO@BiOI was 45.7%, which was significantly higher compared to that of pure BTO (3.6%) or BiOI (23.1%). Moreover, the cycling experiment revealed that BTO@BiOI composite has a good stability and reusability. The possible mechanism of photocatalytic NO oxidation over BTO@BiOI was investigated in detail.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Materials
·
2022
·Vol. 15
·期 6
·2180
·
IF 3.748
Salma Maneno Masawa,Jihong Li,Chenxu Zhao,Xiaolong Liu,Jianxi Yao
Bismuth-based perovskites are potentially a promising alternative for lead-free perovskites. During bond formation, however, trivalent ions onCs3Bi2I9with CsI/BiI3ratio of 1.5/1 form 0D-neutral charged compounds with higher bandgap (>2.0 eV) and poor absorption capacity. Mixed 0/2-dimensional structures are potentially suitable substitutes due to their low bandgap. So far, the reported CsI/BiI3ratios for 0D/2D structures are 1:1, 1:2 and 1:3. Herein, a new ratio of 1/1.5 is reported. Caesium bismuth iodide at a ratio of CsI/BiI3of 1/1.5 was synthesised using a one-step processing method with/without solvent vapour annealing. During solvent annealing, a 1/4 (v/v) mixture of DMF/methanol was used as a solvent. The crystal structure formed at a ratio of 1/1.5 is more similar to 1.5/1 than to 1/3. The XRD pattern revealed additional characteristics peaks at 009, 012, 209 and 300, indicating the growth of another phase. The formed heterogeneous mixed 0D/2D structure has an extended light absorption capacity greater than 720 nm. Solvent vapour annealing improved film morphology by enhancing grain size and packing density. When cells with and without solvent vapour annealing are compared, the power conversion efficiency of caesium bismuth iodide increases from 0.26% without solvent annealing to 0.98% with solvent vapour annealing. This study establishes a new route for future research on crystal configuration, nomenclature, film and morphology, quality tailoring and applications toward the goal of lead-free perovskite solar cells.Keywords:perovskite solar cells;lead-free;solvent vapour annealing;caesium bismuth iodide
研究领域:
材料科学
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太阳能
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纳米技术
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DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Huiyong Wang,Tao Song,Xin Su,Zhiyong Li,Jianji Wang
Bismuth iodide (BiI3) is one of the most excellent nontoxic two-dimensional (2D) layered materials and has attracted increasing attention due to its unique electronic structure and properties. However, the lack of highly effective exfoliation methods for mass production of 2D BiI3 nanosheets hampers their industrial applications. Herein, a facile liquid-phase exfoliation strategy is proposed for the first time to exfoliate the bulk BiI3 powder into few-layer BiI3 nanosheets in high yields and high dispersion contents in green solvents and their mixtures. It is found that the yield of BiI3 nanosheets is as high as about 30% and the dispersion content is up to 1.56 mg/mL. The thickness of nanosheets is 5–10 nm and the lateral dimension is around 1 μm, which is by far the thinnest nanosheet. The solvent–cosolvent interactions in mixed solvents are a critical factor in the liquid-phase exfoliation. In addition, the BiI3 nanosheets have been used as catalysts to improve the C–C cross-coupling reaction between phenyl boronic acid and aryl iodides, and the yield of biphenyl is 91%, which is higher than the highest value (80%) reported in the literature. Thus, the liquid exfoliation strategy reported here has great potential in large-scale and green production of BiI3 nanosheets for high activity catalysis.
研究领域:
材料科学
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催化化学
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DOI
高影响因子
Materials
·
2023
·Vol. 17
·期 1
·6
·
IF 3.4
Yu Lei,Hongdian Chen,Chenyang Shu,Changguo Chen
Developing catalysts with superior activity to hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is equally important to the overall photoelectrochemical water splitting to produce hydrogen. In this work, bismuth oxyiodide (BiOI), iron-modified bismuth iodide Fe/BiOI, and the sulfurized S-Fe/BiOI were prepared using the solvothermal method. The three materials all have good absorption ability for visible light. The photoelectrochemical catalytic activity of BiOI to oxygen evolution reaction (OER) is significantly enhanced after iron modification, while the sulfurized product S-Fe/BiOI exhibits better catalytic activity to hydrogen evolution reaction (HER). Hence, OER and HER can be simultaneously catalyzed by using Fe/BiOI and S-Fe/BiOI as anodic and cathodic catalysts to facilitate the overall photoelectrochemical water splitting process.Keywords:bismuth oxyiodide;iron modification;sulfurization;overall water splitting;photoelectrochemical catalysis
研究领域:
材料科学
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催化
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光电化学
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能源转换
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DOI
PubMed
高影响因子
ACS Applied Nano Materials
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2021
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IF 5.097
Sellan Premkumar,Zhouzheng Jin,Dan Liu,Devaraj Nataraj,Bhekie B. Mamba,Alex T. Kuvarega,Jianzhou Gui
Improving charge transport properties between the quantum dots (QDs) and reducing the non-radiative recombination have been attempted on silver bismuth iodide (Ag2BiI5) perovskite QDs using oleylamine–sulfide passivation. Herein, we have prepared Ag2BiI5 silver bismuth iodide QDs via a simple ligand-assisted reprecipitation method, and the samples were passivated with the oleylamine–sulfide complex. The absorption and emission profiles were red-shifted, which implies that the overall size of the QDs has increased after the passivation. An increase in the emission intensity confirmed the reduction of non-radiative recombination and an increase in excited-state carrier lifetime, as observed from the time-correlated single-photon counting-lifetime measurements. Further, the photocurrent devices were fabricated and generated high-magnitude photocurrent values in the ranges of ∼1.1 to 1.8 μA (bare Ag2BiI5) and ∼0.27 to 0.54 μA (oleylamine–sulfide-passivated Ag2BiI5) for the biasing voltages of 0.1 and 0.2 V, respectively. Surprisingly, the oleylamine–sulfide-passivated Ag2BiI5 sample exhibited a sharp rise in the photocurrent value with a high on/off ratio. In addition, the bare and oleylamine–sulfide-passivated QDs were further applied for the fluorescence detection of copper Cu(II) ions in drinking water samples for the first time.
研究领域:
材料科学
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化学
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环境科学
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DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2023
·
IF 4.1
Huiyan Huang,Guoshu Dai,Xinghua Wu,Yuheng Wu,Aixiang Wei,Zhen Liu
In this work, lead-free and non-toxic (CH 3 NH 3 ) 3 Bi 2 I 9 (abbreviated as MABI) films are synthesized using a two-step sol-gel method, and FTO/MABI/Ag memristors are fabricated based on MABI films. The memristive behaviors in the devices were studied, showing controllable resistance change under voltage sweeps as well as pulses. The memristors are capable of mimicking the plasticity of biological synapses by setting pulse parameters, such as paired pulse facilitation (PPF), long-term plasticity, spike-timing-dependent plasticity (STDP), spike-rate-dependent plasticity (SRDP), and spike-number-dependent plasticity (SNDP). Moreover, the cycle of “learning-forgetting-relearning” typically observed in human learning can be also realized by the memristor. Based on study of current conduction behavior and the influence of top electrodes on I–V hysteresis in the memristors, it is concluded that the formation and rupture of conductive filaments formed by iodine vacancies in the MABI films are responsible for memristive characteristics. The MABI film and FTO/MABI/Ag memristor demonstrated good stability in a three-month test conducted in ambient air. The lead-free, non-toxic, and stable MABI-based memristors can be used promisingly for neuromorphic computing and machine learning in the future.
研究领域:
材料科学
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神经科学
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电子工程
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DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 21
·3751
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IF 5.719
Shindume Lomboleni Hamukwaya,Huiying Hao,Melvin Mununuri Mashingaidze,Tingting Zhong,Shu Tang,Jingjing Dong,Jie Xing,Hao Liu
Lead-free, bismuth-based perovskite solar cells (PSCs) are promising, non-toxic, and stable alternatives to lead-based PSCs, which are environmentally harmful and highly unstable under deprived air conditions. However, bismuth-based PSCs still suffer from low-power-conversion efficiency (PCE) due to their large bandgap and poor film morphology. Their poor film-forming ability is the greatest obstacle to Cs₃Bi₂I₉ progress in thin-film solar cell technology. This study synthesizes novel, lead-free perovskites with a small bandgap, excellent stability, and highly improved photovoltaic performance by integrating different amounts of potassium iodide (KI) into a perovskite precursor solution. KI incorporation improves the crystallinity of the perovskite, increases the grain size, and decreases the potential contact distribution, which is demonstrated by X-ray diffraction, electronic scanning microscopy, atomic force microscopy, and ultraviolet-visible spectroscopy. The Cs₃Bi₂I₉ PSC device with 2 vol. % incorporation of KI shows the highest PCE of 2.81% and Voc of 1.01 V as far as all the Bi-based cells fabricated for this study are concerned. The study demonstrates that incorporating KI in the Cs₃Bi₂I₉ perovskite layer highly stabilizes the resultant PSC device against humidity to the extent that it maintains 98% of the initial PCE after 90 days, which is suitable for solar cell applications. The devices also demonstrate greater resistance to airborne contaminants and high temperatures without encapsulation, opening up new possibilities for lead-free Cs₃Bi₂I₉ PSCs in future commercialization.Keywords:Cs3Bi2I9perovskite solar cells;KI incorporation;crystallinity;morphology;cell stability
研究领域:
材料科学
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能源技术
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DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
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2024
·
IF 4
Liying Ren
Bismuth tri-iodide (BiI 3 ) is commonly determined by spectrophotometric method and atomic absorption spectrometry (AAS) methods, which requires adding the appropriate color developer or re-extraction, and the operation is cumbersome. Herein, we developed the method of detecting BiI 3 with fluorescence spectroscopy for the first time. In this contribution, two novel thiol-linked POPs have been successfully synthesized by thioalk-ynes click polymerization. The chemical structures of the as-prepared thiol-linked POPs were characterized by FT-IR, ss 13 C NMR, UV–vis absorption spectra, and elemental analysis. The as-prepared thiol-linked POPs emit strong fluorescence in 1,4-dioxane (DOX) and could be used for selectively detection of BiI 3 with the high quenching constants of 4.04 × 10 4 and 4.35 × 10 4 L mol −1 , and with the low limits of detection (LODs) of 7.43 × 10 −10 and 6.90 × 10 −10 mol L −1 , respectively. The study of UV–vis absorption spectroscopy has proved that the specific fluorescence quenching process of the thiol-linked POPs to BiI 3 is an absorption competition quenching mechanism.
研究领域:
材料科学
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分析化学
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DOI
高影响因子
OPTICAL MATERIALS
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2024
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IF 3.8
Junzhao Wang,Limin Wang,Chengzhi Chu
In this paper, bismuth-rich three-dimensional Bi 4 O 5 I 2 /BiOBr hollow flower spheres were prepared by a one-pot solvothermal method. The anionic contaminant Rhodamine B (RhB) was used as the photocatalytic test contaminant. The results showed that the degradation rate of RhB was more than 99 %. Then Br element was introduced into Bi 4 O 5 I 2 hollow flower balls, the diameter of flower balls decreased and flowers sparsely. With the increase of Br content, flower balls gradually increased in volume and became denser. Small and sparse flower balls increase the specific surface area of flower balls and increase the number of active sites, thus improving the REDOX capacity of photogenerated electrons and holes. Our findings suggest that both holes (h + ) and superoxide radical anions (•O 2 − ) are crucial players during photocatalysis. The aim of this study is to develop an efficient photocatalyst for the degradation of organic pollutants, and its photocatalytic mechanism is described theoretically.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
Journal of Physical Chemistry C
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2024
·
IF 3.3
Wenjing Zhai,Wenhao Zheng,Penghui Shi,Lin Huang,Xiaomin Cui,Peizhuo Chen,Yuxia Tang,Lin Lin,Zhibo Yan,Jun-Ming Liu
Silver bismuth iodide (Ag–Bi–I) is considered to be a potential photovoltaic material as an eco-friendly semiconductor with a suitable band gap and high stability. However, the reported highest PCE is still far below the ideal value, and the quality of the AgxBiyIx+3y film deserves to be further improved. Herein, we introduce a facile strategy to control the crystallization of AgBiI4 by adding Lewis base additives thiourea (TU) to the AgBiI4 precursor solution. The result indicates that coordination between TU and AgBiI4 precursor solution improves the crystallization, reduces the defect density, and increases the carrier mobility of the AgBiI4 film. The treatment of the TU additive boosts light absorption, reduces charge recombination, and facilitates charge extraction, resulting in improved photovoltaic performance of the AgBiI4 solar cell. Compared to the control device, the treatment of 0.9 mM TU increases the PCE (∼1.87%) of the solar cell by 19.9% and improves the air stability of the solar cell.
研究领域:
材料科学
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光伏技术
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半导体物理
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 23
·20003-20009
·
IF 2.324
Sun Hui,Zhu Xinghua,Wangyang Peihua,Gao Xiuying,Zhu Shifu,Zhao Beijun
Free-standing BiI 3 single-crystal flakes with a rhombohedral appearance and 10–100 µm in thickness were prepared by using physical vapor transport method. The (00 l ) ( l = 3, 6, 9, 12) planes of the as-grown crystal present a distribution of layered structure and approximatively atomically smooth surface with 1.3–1.7 nm step height and roughness average 0.38–0.65 nm. Both planar and coplanar electrode configuration devices for X-ray detection were fabricated with the as-grown BiI 3 single crystals and the dark resistivity 5.8–6.4 × 10 11 Ω cm and 1.2–1.8 × 10 11 Ω cm at room temperature were obtained, respectively. A low dark current or high resistivity for planar device is on account of carrier scattering from the I–Bi–I interlayer van der Waals bonding interface. A high net photocurrent and good sensitivity 1.22–1.36 × 10 4 µC/Gy air /cm 2 under X-ray excitation were also obtained with planar device owing to the uniform electric field distribution and high charge collection efficiency.
研究领域:
材料科学
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物理学
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DOI
高影响因子
MATERIALS LETTERS
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2022
·
IF 3.574
Dongping Zheng,Yingjie Zhang,Xinqi Chen,Pujia Cheng,Fan Wu
A CuO nanocones array (NCA) is introduced as a hole collecting layer for a top light-incident Cs 3 Bi 2 I 9 perovskite photodetector. Its photocurrent response ( i - t ) shows that the photocurrent of the CuO-NCA/Cs 3 Bi 2 I 9 device, and its responsivity, are one order of magnitude higher than that of the CuO thin film/Cs 3 Bi 2 I 9 based device. Moreover, the increased interfacial area between the Cs 3 Bi 2 I 9 and CuO-NCA facilitates hole collecting. While the transfer of the photogenerated holes is more effective and straightforward in aligned nanocones, which contributes to a larger photocurrent. The dynamics of the photo-generated charge transport also indicates a significantly improved charge transfer and a decreased charge recombination in the CuO-NCA/Cs 3 Bi 2 I 9 based device.
研究领域:
材料科学
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光电子学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）