ChemNanoMat
·
2022
·Vol. 9
·期 1
·e202200400
·
IF 3.82
Bo Zhu,Xu Lu,Jiadang Li,Wenhao Xie,Lifei Wang,Qiang Zhang,Jianfeng Fan,Yun Zheng
Graphical The substitution of iso-valent Bi for Sb is adopted to adjust the thermoelectric transport properties of the undoped Mg 3 Sb 2 compound. The improved power factor and figure of merit are obtained accordingly. Bismuth is the most common alloying element for high-performance Mg 3 Sb 2 -based thermoelectric compounds. However, the electrical and thermal transport data is lacking for undoped Mg 3 (Sb, Bi) 2 solid solutions. In this study, theoretical calculation results show that Bi alloying can reduce the band gap of Mg 3 Sb 2 , favoring the regulation of carrier concentration. Both Mg 3 Sb 2 and Mg 3 SbBi compounds present a single band structure on the valence band maximum at Γ of the Brillouin zone. Incorporating the Bi element can slightly increase the density of states (DOS) on the valence band maximum, which is beneficial for the Seebeck coefficient. Mg 3 Sb 2-x Bi x (0≤x≤0.8) compounds were experimentally prepared via ball milling (BM) combined with the spark plasma sintering (SPS) technique. The carrier concentration, electrical conductivity, and power factor of the samples tend to increase with the increasing Bi content. Bismuth alloying significantly reduces the total thermal conductivity in the low-temperature range, with the lowest value of 0.65 Wm −1 K −1 obtained at ∼400 K for the x=0.2 sample. The peak ZT value of 0.077 at 800 K and the average ZT of 0.051 in the temperature range of 450–800 K are obtained for the x=0.2 sample, which is 93% and 219% higher than those of the unalloyed sample, respectively. This work reveals the Bi-alloying induced transport mechanism and provides fundamental thermoelectric data regarding the undoped Mg 3 Sb 2-x Bi x (0≤x≤0.8) solid solutions.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2021
·
IF 4.837
Kehan Fan,Chuan Yu,Sentai Cheng,Shenyu Lan,Mingshan Zhu
Development of high-performance piezocatalyst has attracted much attention for efficiently piezocatalytical removal of pharmaceuticals and personal care products in the wastewater. In this work, metallic Bi nanoparticles were successfully self-deposited on the surface of piezocatalyst BiOCl via an in-situ reduction method to modify the piezoelectric response for the piezocatalytic degradation of carbamazepine (CBZ). The present of Bi nanoparticles significantly enhanced piezocatalytic performance of BiOCl , in which 75.11% of CBZ (5 mg/L) was removed under ultrasonic vibration in the presence of Bi/BiOCl-50 (0.5 g/L) after 30 min, being 52.72% higher than that of pure BiOCl. Through scavenger test, electron paramagnetic resonance detection and electrochemical analysis , the enhanced piezocatalytic activity was due to that Bi nanoparticles improved the separation efficiency of piezoelectric charges to generate more reactive oxygen species. The stability of the piezocatalyst, effects of reaction parameters, treatment performance of real wastewater , and the possible pathways of CBZ degradation were systematically investigated. The work provides a deep understanding on the piezocatalytic process and brings a new track to enhance the piezocatalytic performance for Bi-based piezoelectric materials without introducing any impurities in water purification .
研究领域:
环境科学
·
材料科学
·
水处理
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DOI
高影响因子
NEW CARBON MATERIALS
·
2020
·
IF 1.761
Chi Song,Lin-jie Wang,Si-miao Sun,Ying Wu,Li-jie XU,Lu Gan
A series of ternary composite photocatalysts of Bi 2 O 3 /Bi embedded in porous carbon (Bi 2 O 3 /Bi/PC) was prepared by the high-temperature pyrolysis of a bismuth-based metal organic framework (CAU-17(Bi)). They were used as photocatalysts for the degradation of organic Rhodamine B dye (RhB) in water under visible light. Results showed that the Bi 2 O 3 /Bi/PC composites with different Bi 2 O 3 /Bi ratios could be obtained through changing the extent of the carbothermal reduction of Bi 2 O 3 during pyrolysis. The photocatalystpyrolyzed at 800 o C showed the highest photocatalytic performance and had a wide applicable pH value range and excellent recyclability and stability.The components in the ternary composites exhibited a synergetic effect in the removal of RhB, where Bi 2 O 3 acted as a low-band gap semiconductor, metallic Bi transferred electrons generated by visible light excitation to the graphitic structure in porous carbon to inhibit the recombination of electrons with holes. The holes and peroxide radicals were the main active species. This study provides a new way for the design and preparation of visible-light active and high-performance photocatalysts for organic contaminant degradation in aqueous media by using metal organic frameworks as a multicomponent precursor.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Wenhao Fan,Shaoping Chen,Bo Zeng,Qiang Zhang,Qingsen Meng,Wenxian Wang,Zuhair A. Munir
Solid solutions of Mg2Si0.6Sn0.4–xBix with 0 ≤ x ≤ 0.03 were prepared by a one-step synthesis and consolidation method, using MgH2 as a starting material. The thermoelectric properties of these samples were evaluated over the temperature range 300–775 K. Figure of merit, zT, values were determined over this range for all compositions and found to increase with temperature reaching a value of 1.36 at 775 K for samples with x = 0.02. Examination of the components of the total thermal conductivity showed that the bipolar thermal conductivity is suppressed by an increase in the band gap, resulting from solid solution formation, and by low minority carrier mobility. The suppression of the bipolar thermal conductivity is believed to be the consequence of charged grain boundaries.
研究领域:
材料科学
·
热电学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Sihan Ma,Xian Luo,Guang Ran,Yipeng Li,Ziqi Cao,Xinyi Liu,Guoqiang Chen,Jianghua Yan,Lin Wang
Optical antibacterial agents present great potential in eliminating infectious pathogens. It is of great significance to construct effective photonic antibacterial agents with outstanding light absorption properties. Herein, 2D engineering defect nanosheets BiOI/Bi with Bi decoration and defect engineering (BiOI-DE) are constructed to perform photonic sterilization. On the one hand, the rational designed BiOI-DE can effectively promote the broad-spectrum light absorption ability to enhance the light utilization rate. On the other hand, the substantive structure can simultaneously harvest the enhanced photonic carriers and thermal effect when irradiated with high penetration ability NIR, further exhibiting higher activity in killing Escherichia coli (E. coli) than that of single BiOI with poor light absorption. The sterilization efficiency is over 99%. Moreover, the causes of the photothermal effect are discussed, indicating that the change of BiOI bandgap and surface bismuth decoration displays a critical role in enhancing light absorption and creating heat energy. In the meantime, the structural advancement of BiOI-DE effectively improves the photocatalytic activity, the synergistic photothermal-catalytic process establishes a favorable condition for improving antibacterial performance. This system provides rational design and potential inspiration for high efficient antibacterial strategy by employing defect engineering approaches.
研究领域:
材料科学
·
生物医学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Yunmeng Cao,Lin Yue,Zaixing Li,Yonghui Han,Jing Lian,Huiping Qin,Shuyan He
In this study, Sn–Bi–MOF/Ti 3 C 2 heterojunction catalysts were prepared using the solvothermal method, and their photocatalytic ability to degrade and mineralize tetracycline (TC) under illumination was investigated. After 90 min of photocatalysis, the pollutant had a degradation efficiency of 96.2% and a mineralization rate of 45.5%. The physicochemical properties of the catalysts were analyzed using various methods. The effects of the solution pH, coexisting anions, and water quality on the catalyst performance were investigated. ·O 2 − and h + are the main active substances in the photocatalytic mechanism, as demonstrated by free-radical quenching experiments and EPR tests. The degradation of TC and the intermediates produced were determined using 3D fluorescence and LC-MS. The photocatalytic mechanism of Sn–Bi–MOF/Ti 3 C 2 was proposed based on free radical determination and electrochemical tests. The formation of the Schottky junction accelerated the transfer of electrons to Ti 3 C 2 and improved the separation of charges, which led to the generation of free radicals. Sn–Bi–MOF/Ti 3 C 2 still exhibited good catalytic ability after four cycles of the experiments, and the XRD patterns before and after the reaction were consistent, which illustrates that the composite structure was stable. Overall, Sn–Bi–MOF/Ti 3 C 2 has promising applications in the photocatalytic removal of refractory pollutants.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
BIOMATERIALS
·
2019
·
IF 10.273
Weihua Liao,Peng Lei,Jinbin Pan,Cai Zhang,Xianting Sun,Xuejun Zhang,Chunshui Yu,Shao-Kai Sun
Clinically used iodinated computer tomography (CT) contrast agents suffer from low sensitivity, and the emerging lanthanide-chelates and CT imaging nanoagents raise great safety concerns. The fusion of high sensitivity and good biocompatibility is highly desired for the development of CT contrast agents. Herein, we propose a facile and green one-pot synthesis strategy for the fabrication of a small molecular CT contrast agent, Bi-diethylene triamine pentaacetate acid (DTPA) complex, for high-performance CT and spectral CT imaging. The Bi-DTPA exhibits yield of near 100%, outstanding water solubility, favorable biocompatibility, large-scale production capability, and superior X-ray attenuation ability, and is successfully applied in high-quality in vivo kidney imaging and gastrointestinal tract CT imaging and appealing spectral CT imaging. The proposed contrast agent can be rapidly excreted from body, avoiding the potential side effects caused by the long-term retention in vivo. Furthermore, our design shows great potential in developing diverse multifunctional contrast agents via chemical modification. The proposed Bi-DTPA with unique superiorities shows a bright prospect in clinic CT imaging, especially spectral CT imaging, and lays down a new way for the design of high-performance CT contrast agents with great clinical transformation potential.
研究领域:
医学影像学
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生物医学工程
·
放射医学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Fei Li,Bo Dong,Shenglei Feng
Photoelectrochemical (PEC) seawater splitting can relive the shortage of purified water feedstocks . However, the corrosion from seawater on the photoelectrode becomes an uncertain influence factor for PEC performance. Developing an efficient and stable photoelectrode is a challenge. Herein, we present a Bi–BiOI shell-core microspheres modified TiO 2 nanotube arrays (TNA) photoanode prepared via solvothermal method , affording superior PEC hydrogen evolution activity in simulated seawater under AM1.5G light, which is 3.8 and 7.6 times than those of BiOI/TNA and TNA, respectively. Solar-to-hydrogen conversion efficiency of Bi–BiOI/TNA reaches to 2.21% with Faradaic efficiency up to 85.7%. Based on the optical and PEC measurements, it is verified that surface plasmon resonance effect of metallic Bi promotes transfer and separation of photogenerated charge and enhances visible-light absorption, thus benefiting higher PEC performance. Especially, Bi shell efficiently hinders the corrosion of BiOI by seawater. Our work provides a novel paradigm of photoanode for efficient and stable PEC seawater splitting.
研究领域:
材料科学
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能源科学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 34
·13171-13175
·
IF 8.262
Zhiwei Zhou,Junyou Yang,Qinghui Jiang,Yubo Luo,Dan Zhang,Yangyang Ren,Xu He,Jiwu Xin
We studied the effect of doping with Bi on the thermoelectric properties of SnTe-based materials. Doping with Bi reduced the density of holes and increased the Seebeck coefficient over a wide temperature range as a result of modulation of the carrier concentration and an increase in the density of states effective mass. The lattice thermal conductivity was also greatly reduced as a result of the wide frequency range of phonon scattering by multiscale architectures derived from Bi doping. A maximum ZT value of c. 1.1 at 873 K was obtained in Sn0.94Bi0.06Te, an enhancement of 165% compared with the undoped sample.
研究领域:
材料科学
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热电材料研究
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Huaguo Jiang,Zeming Lu,Bin Qian,Shun Wang,Bo Yin,Yifeng Zheng,Lin Ge,Han Chen,Caizhi Zhang
Bi-doped La 1.5-x Bi x Sr 0.5 Ni 0.5 Mn 0.5 O 4+δ (LBSNM-x, x = 0, 0.05, 0.1, 0.15) was investigated as a potential air electrode for solid oxide electrolysis cell (SOEC). The effect of Bi doping on the structure, electrical conductivity , chemical compatibility with GDC electrolyte, electrochemical performance and thermal expansion coefficients (TECs) were investigated. XRD characterization results show that the solid solution content of Bi is less than or equal to 0.1. XPS characterization results indicate that Bi doping increases the oxygen vacancy content of LBSNM-x air electrode and thus greatly benefits its oxygen evolution reaction . Among the Bi-doped samples, LBSNM-0.1 electrode has the best electrochemical performance with its lowest Rp (polarization resistance) of 0.28 Ω cm 2 at 800 °C based on LBSNM-0.1/GDC half-cell. LBSNM-0.1 single cell with 70%CO 2 + 30%CO fuel gas feed on the fuel electrode has achieved current density of 811 mA cm −2 at 800 °C and 1.4 V, a 62.2% increase relative to that of LSNM single cell. In addition, LBSNM-0.1 single cell exhibits excellent stability at 800 °C and 1.3 V with 70%CO 2 + 30%CO feed gas on the fuel electrode. These results prove that Bi-doped LBSNM-0.1 is an efficient air electrode for SOEC.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2025
·Vol. 39
·期 3
·e70021
·
IF 0
Zehua Yuan,Munire Tuerhong,Xirenayi Aisikaer,Gulgina Mamtmin
The Type II heterojunction, characterized by its favorable band alignment, facilitated efficient charge separation in photocatalysts. Concurrently, oxygen vacancies can enhance light absorption and activated reactants, thereby improving photocatalytic efficiency. This study presented the synthesis of Bi-TCPP/Bi 2 S 3 heterojunction photocatalysts, which were rich in oxygen vacancies, using a green, one-pot method. The composite exhibited superior photoelectrochemical and photocatalytic reduction properties, achieving a rate constant of 0.03829 min −1 for Cr(VI) reduction and a remarkable reduction rate of 95.73%. After five cycles, the photocatalytic activity remained above 91.30%, demonstrating excellent stability and efficiency in reducing persistent pollutants. This work introduced a novel strategy for photocatalyst design and made a significant contribution to the fields of environmental remediation and green chemistry.
研究领域:
环境科学
·
材料科学
·
绿色化学
✓ 已验证
产品关联
DOI
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Han Xu,Gangsong Huang,Wenting Zhou,Xuan Miao,Hongjun Ji,Mingyu Li,Yufeng Li
In the realm of electronic packaging advancements, the utilization of metal to ceramic joints has garnered significant attention. This manuscript details the development of a specific glass solder with excellent wettability and a thermal expansion coefficient of 8.1 × 10 −6 °C −1 , comprising 35Bi 2 O 3 -30B 2 O 3 -15ZnO-20SiO 2 (mol.%). This design achieves reliable connection of the Al 2 O 3 ceramics and Kovar alloy in an atmospheric environment. The interface reaction between the glass solder, Al 2 O 3 ceramics, and oxidized Kovar alloy resulted in the formation of ZnAl 2 O 4 particles and Bi spheres at the joints. The enhancement in joint shear strength was primarily attributed to the nanoscale, dispersed ZnAl 2 O 4 particles. However, the presence of microscale Bi spheres, with a lower elastic modulus than the glass solder, initiated cracks during shear deformation, thereby compromising the integrity of the joint. Optimization of brazing temperatures enabled control over the ZnAl 2 O 4 and Bi sphere phases within the joints, yielding a peak shear strength of 51.7 ± 8.9 MPa at 650 °C. This study highlights the achievement of high-performance metal-ceramic bonding through tailored interface reactions and optimized joint microstructures.
研究领域:
材料科学
·
电子封装
·
连接技术
·
陶瓷-金属连接
·
玻璃焊料
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）