MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2024
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IF 4.2
Fanhua Yu,Shaojie Hong,Bin Guo,Xiangqian Ren,Xingfu Zhou
Ozone water is widely used in disinfection area and wastewater treatment due to its strong oxidation. Recent studies have found that Ti/SnO 2 -Sb-Ni (NATO) anode has higher O 3 generation efficiency due to its higher oxygen evolution potential. In this paper, TiO 2 nanotubes (TiO 2 -NTs) were prepared by anodic oxidation method as the basic substrate material for the Ti/SnO 2 -Sb-Ni electrode, and SnO 2 -Sb-Bi was introduced as the intermediate layer to investigate the electro-synthesis of ozonated water. Studies show that the modification of the TiO 2 -NTs substrate provides a larger specific surface area for the reaction and accelerates the transfer of electrons from the oxide layer to the substrate. The introduction of the SnO 2 -Sb-Bi intermediate layer effectively delays the electrode deactivation and also enhances the electron transport. When the Ti/TiO 2 NTs/SnO 2 -Sb-Bi/NATO electrode was used and electrolyzed for 15 min, the ozone water concentration reached 13.15 mg L −1 , about twice as much as the unmodified electrode. The effects of current density and the coating numbers of active layers on the electrosynthesis of the ozonated water were also investigated. Finally, the application of ozonated water in the decolorization of organic dye wastewater was investigated based on its strong oxidation property, the degradation rate of 40 ppm methylene blue reached 94.5 % and the COD removal rate reached 72.9 % in 30 min. In addition, the cell voltage remained constant during decoloration, indicating the good stability of the electrode. This study also opens a door to the rapid electrochemically decoloration of wastewater and sterilization area by using electrochemically obtainable ozone water.
研究领域:
环境科学
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电化学
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材料科学
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产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Songlin Wang,Nan Jiang,Qiying Zhang,Huabo Li,Hongying Niu,Tong Chen,Gongying Wang
Methyl phenyl carbonate (MPC) is one of the versatile carbonates; in particular, it is an important component in lithium-ion batteries. In recent years, the catalytic synthesis of MPC has become an important topic, but the development of highly active catalysts is still challenging. In this study, SBA-15-loaded nano-sized Pb–Bi catalysts with different Pb/Bi molar ratios were prepared by deposition–precipitation to improve the efficiency and selectivity. To investigate the relationship between the structure and performance of the catalysts, XRD , BET, SEM-EDS, HRTEM , H 2 -TPR, and XPS characterization, as well as catalytic activity and stability tests, were conducted. Results revealed that Pb–Bi/SBA-15 can efficiently catalyze the synthesis of MPC under solvent-free conditions, with the highest catalytic activity obtained over 6 Pb–1Bi/SBA-15. SBA-15 with a large pore size and a high specific surface area was suitable as catalyst carrier, and the average diameter of Pb–Bi oxide particles was ∼3.57 nm. The addition of Bi led to the improved dispersion of active components, which were highly and evenly dispersed on the SBA-15 surface. Furthermore, an appropriate proportion of Pb and Bi on SBA-15 was conducive to the considerable enhancement of the catalytic activity. Besides, Pb–Bi/SBA-15 also exhibited good durability and recyclability, making it a promising catalytic material for the synthesis of various carbonates.
研究领域:
材料科学
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催化化学
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产品关联
DOI
高影响因子
Journal of Nanomaterials
·
2021
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IF 2.986
Chunbei Wu,Chuxin Zhou,Yuanyuan Chen,Zhigang Peng,Jun Yang,Yuanming Zhang
A Bi-BiOBr/BiPO4 heterojunction structure was successfully synthesized via a two-step solvothermal method with ethylene glycol as a reducer. Little BiPO4 irregular polyhedrons and little metal Bi spherical nanoparticles were uniformly dispersed on the surface of BiOBr nanosheets with intimate contact and formed a heterojunction structure between BiPO4 and BiOBr. It was found that Bi-BiOBr/BiPO4 had a significant improvement in photocatalytic performance for RhB degradation compared to bare BiOBr and BiPO4. The photocatalytic degradation rate constant of 0.2-Bi/BiOBr/BiPO4 was 1.44 h-1, which was 3.8 times and 14.2 times more than that of bare BiOBr and BiPO4, respectively. This is attributed to the formation of a ternary heterojunction, which benefits the separation of photogenerated electron-hole pairs. Furthermore, with the introduction of metal Bi, the SPR effect of metal Bi can effectively improve the absorption ability of Bi-BiOBr/BiPO4 photocatalyst, resulting in enhanced photoactivity. In this work, the mechanism of photocatalytic degradation was studied by using the photochemical technique and the capture experiment of active species, and it was revealed that h+ and ⋅O2- played a major role in the photocatalytic process.
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
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Zhe Xu,Xiao-Lei Shi,Yibo Zhang,Jisheng Liang,Meng Li,Chengyan Liu,Lei Miao,Siqi Liu,Shihao Wang,Qi Zhou,Jie Gao,Zhongwei Zhang,Wei-Di Liu,Ying Peng,Jun-Liang Chen,Zhi-Gang Chen
Owing to the non-toxicity and low cost, Mg 3 Sb 2 -based Zintls are promising candidates for mid-temperature thermoelectric applications. However, the thermoelectric performance of p-type Mg 3 Sb 2 is significantly lower than that of n-type ones. Here, we achieve simultaneous optimization of the band structure and enhanced phonon scattering through the combined doping of Na at the cation site and Bi at the anion site, leading to a competitive figure of merit, ZT of 0.73 at 773 K and a maximum theoretical energy conversion efficiency of 6.5 % at a temperature difference of 450 K. First-principles calculations indicate that Na and Bi co-doping effectively narrows the band gap and shifts the Fermi level into the valence band, thereby increasing the hole carrier concentration. This ensures a relatively high Seebeck coefficient and improved electrical conductivity, resulting in an excellent power factor of 7.5 µW cm −1 K −2 . Additionally, by adjusting the amount of Bi nanoprecipitates in the matrix, the heterogeneous interfaces significantly enhance phonon scattering and markedly reduce the lattice thermal conductivity (0.52 W m −1 K −1 ), collectively leading to the high thermoelectric performance. Furthermore, by pairing n-type Mg 3.18 Y 0.02 Sb 1.5 Bi 0.49 Se 0.01 , a double-leg thermoelectric device achieves an energy conversion efficiency of 4.1 % with a temperature difference of 390 K.
研究领域:
材料科学
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热电材料
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DOI
高影响因子
OPTICAL MATERIALS
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2017
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IF 2.238
Yuxian Xu,Yongjin Luo,Qingrong Qian,Baoquan Huang,Qinghua Chen
Visible-light-induced BiOCl/Bi/P25 composite materials were prepared via a hydrothermal method , and evaluated by degradation of methyl orange (MO) aqueous solution. It exhibits the highest photocatalytic efficiency, which is 53.6 and 23.9 times higher than that of Bi/BiOCl and P25, respectively. The superior activity is attributed to the surface plasmon resonance (SPR) of metallic Bi , and the efficient separation of the photogenerated carriers with the aid of BiOCl/P25 heterostructure . In the photodegradation process, holes (h vb + ) can react with Cl − ions to form Cl radicals, both of which can oxidize MO. Then Cl radicals reduce to Cl − again, forming a circulation and improving the photocatalytic activity .
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2024
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IF 4.8
Songbo Tan,Peipei Jiang,Jun Liu,Xuan Yang,Yifeng Lai,Xiaowei Hu,Guowen Peng,Guohui Wang
With the increasing complexity of radiation environments, the development of effective shielding materials against 222 Rn and gamma radiation is critical for ensuring human health and safety. This study utilized a two-step hydrothermal method to synthesize Gd₂O(CO₃)₂@bismuth-based metal–organic frameworks (Bi-MOFs)/graphene nanoplatelets (GBG) composite fillers, followed by melt blending and hot-press molding to develop GBG/polymethyl methacrylate (PMMA) composites aimed at shielding against 222 Rn and gamma radiation. The successful synthesis and structural integrity of the composites were confirmed using various characterization techniques, including x-ray diffraction, Fourier-transform infrared spectroscopy, scanning electron microscopy, and energy-dispersive x-ray spectroscopy. The experimental results indicate that the GBG composite filler exhibits superior enhancement in 222 Rn shielding capabilities, with the 222 Rn diffusion coefficient of GBG/PMMA-20 composites reduced to 1.41 × 10 −13 m 2 /s, a 98.6% decrease compared to pure PMMA (1.04 × 10 −11 m 2 /s). Furthermore, the GBG demonstrates outstanding improvements in gamma-ray shielding performance, with the mass attenuation coefficient of GBG/PMMA-50 reaching 2.70 cm 2 /g for 59.5 keV gamma rays, nearly 16 times higher than that of pure PMMA (0.16 cm 2 /g). Additionally, thermogravimetric analysis revealed that the introduction of GBG fillers significantly improves the thermal stability of the PMMA composites. This work could offer an innovative approach to the design of 222 Rn and gamma radiation shielding materials. Highlights Developed a novel composite for enhanced 222 Rn and gamma radiation shielding. Introduced Gd-based fillers to enhance gamma radiation attenuation in PMMA composites. Achieved superior thermal stability in PMMA composites compared to pure PMMA. Materials designed for application in high-radiation environments, including mining.
研究领域:
材料科学
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辐射防护
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复合材料
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产品关联
DOI
高影响因子
ChemSusChem
·
2024
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IF 7.5
Guorui Ma,Haiqiang Mu,Zhenli Lv,Jiaxing Guo,Min Zhu,Yonghong Li,Xiaozhong Wang,Jing Li,Feng Li
Graphical In the work, a Bi/ZnO@ZnSe photocathode with a lattice-matching interface and long-life high-energy photoelectrons is designed for the photoelectrocatalytic conversion of CO 2 to CO, which achieves a Faradaic efficiency of 88.9 % at −0.9 V vs. RHE and demonstrates excellent stability. The key aspect of the photoelectrochemical CO 2 reduction reaction (PEC CO 2 RR) lies in designing cathode materials that can generate high-energy photoelectrons, enabling the activation and conversion of CO 2 into high-value products. In this study, a coaxially wrapped ZnO@ZnSe array heterostructure was synthesized using a simple anion exchange strategy and metallic Bi nanoparticles (NPs) were subsequently deposited on the surface to construct a Bi/ZnO@ZnSe photocathode with high CO 2 conversion capability. This array photocathode possesses a large aspect ratio, which simultaneously satisfies a low charge carrier migration path and a large specific surface area that facilitates mass transfer. Additionally, the barrier formed at the n-n heterojunction interface hinders the transfer of high-energy photoelectrons from ZnSe to lower energy levels, resulting in their rapid capture by Bi while maintaining a relatively long lifetime. These captured electrons act as active sites, efficiently converting CO 2 into CO with a Faradaic efficiency above 88.9 % at −0.9 V vs. RHE and demonstrating superior stability. This work provides a novel approach for synthesizing high-energy photoelectrode materials with long lifetimes.
研究领域:
材料科学
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电化学
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能源转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Photonics Research
·
2021
·Vol. 9
·期 11
·2182-2189
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IF 7.08
Shunfa Gong,Ruirui Wu,Sen Yang,Lifang Wu,Minmin Zhang,Qiuju Han,Wenzhi Wu
The toxicity and instability of lead halide perovskite seriously limit its commercial application in lighting, although it has high photoluminescence (PL) efficiency and adjustable emission. Here, lead-free bismuth (Bi) and antimony (Sb) codoped Cs2SnCl6 (BSCSC) microcrystals (MCs) are prepared successfully by a solvothermal method. The PL spectrum is composed of dual emission bands with the peak at 485 and 650 nm, of which relative intensity can be tunable through the change of Bi and Sb feeding contents, respectively. Because of the phonon–electron interaction, the PL intensity is enhanced as the temperature rises within the range of 80–260 K. Then, the nonradiative transition is intensified until 380 K, which results in decrease in PL intensity. Simultaneously, combining with time-resolved PL, it is concluded that the emission peak at 485 nm is attributed to the [BiSn+VCl] as the luminescent centers with the lifetime of hundreds of nanoseconds, and the emission peak at 650 nm is attributed to microsecond-timescale self-trapped excitons. The maximum values of relative sensitivity (SR) and absolute sensitivity (SA) values obtained are 3.82% K−1 and 5.11 ns ·K−1, which for the first time to our knowledge demonstrate that BSCSC MCs can be novel luminescent materials for developing better optical thermometry. White-light-emitting diodes (WLEDs) are constructed using BSCSC MCs only combined with an LED chip, the Commission Internationale de L’Eclairage color coordinates of which are (0.30, 0.37). It provides a novel scheme for the lighting field to realize WLEDs without adding additional commercial phosphors.
研究领域:
材料科学
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光学
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光子学
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纳米技术
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产品关联
DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2020
·Vol. 36
·期 1
·120-126
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IF 1.063
Chen Jianfei,Chen Xiaoyu,Zhang Xing,Yuan Yao,Bi Ruyi,You Feifei,Wang Zumin,Yu Ranbo
BiVO 4 , a promising visible-light responding photocatalyst, has aroused extensive research interest because of inexpensiveness and excellent chemical stability. However, its main drawback is the poor photoinduced charge-transfer dynamics. Building nanostructures is an effective way to tackle this problem. Herein, we put forward a new method to prepare nanostructured BiVO 4 from Bi-based metal-organic frameworks[Bi-MOF(CAU-17)] precursor. The as-prepared material has a rod-like morphology inherited from the Bi-MOF sacrificial template and consists of small nanoparticle as building blocks. Compared with its counterparts prepared by conventional methods, MOF-derived nanostructured BiVO 4 shows better light absorption ability, narrower bandgap, and improved electrical conductivity as well as reduced recombination. Consequently, BiVO 4 nanostructure demonstrates high photocatalytic activity under visible light towards the degradation of methylene blue. Methylene blue can be degraded up to 90% within 30 min with a reaction rate constant of 0.058 min −1 . Moreover, the cycling stability of the catalyst is excellent to withstand unchanged degradation efficiency for at least 5 cycles.
研究领域:
材料科学
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环境科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Nano
·
2023
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IF 10.3
Luchen Ai,Huanshun Yin,Suo Wang,Jun Wang,Xiaolong Gao,Xianqiang Yin,Kunpeng Dou,Peng Ju,Huimin Sun
To improve the photocatalytic activity of BiOF under simulated sunlight irradiation, a ternary Bi-based Z-scheme heterojunction of Bi/BiOF/Bi 2 O 2 CO 3 nanosheets were prepared using one-pot hydrothermal technique, where N, N-dimethylformamide was used as carbon source for Bi 2 O 2 CO 3 and reductant for metal Bi, bismuth nitrate was employed as Bi source and NaF was used as F source. The photocatalytic activity of Bi/BiOF/Bi 2 O 2 CO 3 was improved greatly towards ciprofloxacin degradation with the reaction kinetic constant of 0.0649 min −1 , which was 7 and 3.5 times to that of BiOF and Bi 2 O 2 CO 3 , respectively. The improved photocatalytic activity was ascribed to the surface plasmon resonance effect of metal Bi and the synergistic effects of BiOF/Bi 2 O 2 CO 3 Z-scheme heterojunction, which facilitated the migration of the photogenerated electron and inhibited the recombination of photogenerated e − /h + pairs. The degradation mechanism and charge transfer pathway were confirmed. This work expands the application of BiOF-based photoactive materials in environmental field.
研究领域:
材料科学
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环境科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2021
·Vol. 15
·期 2
·1409-1414
·
IF 8.897
Liu Jinze,Li Yuhang,Wang Yating,Xiao Chuqian,Liu Miaomiao,Zhou Xiaodong,Jiang Hao,Li Chunzhong
Electrochemical reduction of CO 2 to valuable formate as liquid fuel is a promising way to alleviate the greenhouse effect. The edge active sites in bismuth (Bi) nanosheets play a critical role in the electrochemical reduction of CO 2 into formate, which enable the operation of CO 2 reduction with high cathodic energy efficiency, especially under large current densities of ≥ 200 mA/cm 2 . However, the undesirable reconstruction of small Bi nanosheets into large nanosheets leads to the decreasing of edge active sites during electrocatalysis. Here we report stable isolated ultrasmall bismuth nanosheets-synthesized by in-situ electrochemical transformation of ligands covered bismuth vanadate-on silver nanowires as an efficient electrocatalyst for CO 2 -to-formate reduction. The cooperative electrocatalyst achieves a formate current density of 186 mA/cm 2 and a cathodic energy efficiency of 75% for formate, which is the only best compared to the literature results. Operando Raman and morphologic measurements demonstrate that the excellent energy utilization of the electrocatalyst is originated from the rich edge active sites with Bi-O species of the ultrasmall Bi nanosheets.
研究领域:
电化学
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材料科学
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催化
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能源转换
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMISTRY
·
2021
·Vol. 40
·期 2
·247-255
·
IF 6
Qian Wang,Huanshun Yin,Yunlei Zhou,Lulu Cao,Zhengkun Yu,Yamin Xu,Shiyun Ai
Comprehensive Summary As a key epigenetic modification, 5-formylcytosine (5fC) controls many important cell functions, such as gene expression and cell differentiation. However, 5fC exists in mammalian tissues and cells with low content, and its structure is highly similar to 5-methylcytosine (5mC), 5-hydroxymethylcytosine (5hmC) and 5-carboxycytosine (5caC), which requires the detection method for detecting 5fC with high sensitivity and specificity. In this experiment, WS 2 /Bi/Bi 2 O 2 CO 3 was used as the photoactive material, 5fC antibody was used as the target molecule recognition reagent, and rolling amplification (RCA) was employed as the signal amplification strategy to construct a novel photoelectrochemical biosensor for detecting 5-formylcytosine deoxynucleotide (5fdCTP). Firstly, WS 2 /Bi/Bi 2 O 2 CO 3 nanocomposite was prepared and characterized, and then modified on the ITO electrode. Then, polyacrylic acid (PAA) was immobilized by electrostatic adsorption, which was employed as the antibody capture reagent based on the covalent reaction of –COOH on PAA with –NH 2 on Ab. Subsequently, 5fdCTP was recognized through immunoreaction, triggering the subsequent rolling circle amplification reaction with the aid of the crosslinker of Zr 4+ . Finally, positive methylene blue (MB) was adsorbed by negative ssDNA, resulting in an increased photoelectric conversion efficiency of WS 2 /Bi/Bi 2 O 2 CO 3 and improved detection sensitivity. The linear range of the PEC biosensor for detecting 5fdCTP was 0.05—100 nmol/L, and the minimum detection concentration was 12.4 pmol/L (S/N = 3). The applicability of this method has been evaluated by studying the influence of Cd 2+ and antibiotic concentration on the 5fC content in the genomic DNA of maize seedlings.
研究领域:
生物化学
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分子生物学
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分析化学
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DOI
高影响因子
危险品化学品经营许可证（带存储）