MATERIALS CHEMISTRY AND PHYSICS
·
2018
·
IF 2.21
Wei Zhang,Zhiyuan Wang,Keyu Chen,Lang Li,Li Tao,Jun Zhang,Hao Wang
Two types of bi-component supramolecular gel electrolytes were prepared. It is interesting that the single molecular N,N ′-1,3-propanediylbis-dodecanamide cannot form gel electrolyte. However, when 1,6-diaminohexane and adipic acid as co-gelators were added to the liquid electrolyte containing N,N ′-1,3-propanediylbis-dodecanamide, the corresponding supramolecular gel electrolytes, Gel 1 and Gel 2 were formed. And these two gel electrolytes exhibit significantly different morphology of 3D network. The influences of different morphology and electrolyte component on the dynamic process and photovoltaic performances of quasi-solid-state dye-sensitized solar cells (QS-DSSCs) were investigated by the controlled intensity modulated photocurrent/photovoltage spectroscopy (IMPS/IMVS) measurements and electrochemical impedance spectroscopy (EIS) measurements. It is found that Gel 2 presents a sparser network structure compared with Gel 1. Moreover, Gel 2 based QS-DSSC shows a dramatic enhancement in short circuit photocurrent density ( J sc ) and while a slightly decrease in open circuit voltage ( V oc ) than those of Gel 1 based QS-DSSC. And more remarkable, the power conversion efficiency of Gel 2 based QS-DSSC (5.89%) is higher than that of Gel 1 based QS-DSSC (5.05%), which even slightly exceeds that of the DSSC based on the liquid electrolyte (5.82%).
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高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2025
·
IF 9.8
Xin Qu,Ce Wang,Yuanyu Zhao,Jinqiu Ye,Ping Hu,Rui Zhao,Yong Liu
Human activities, ranging from medical applications to space exploration, face significant threats from multiband electromagnetic radiation. This challenge is particularly pronounced in the complex radiation environments of space. There is an urgent need for high-efficiency, stable broadband electromagnetic shielding materials to safeguard human health and equipment safety. Herein, a Bi-modified W 18 O 49 /MWCNTs/PAN hybrid nanofiber membrane is successfully prepared by electrospinning and post-treatment. Relying on the synergistic effect of Bi, W 18 O 49 , MWCNTs, and porous structures, excellent broadband radiation protection capability is achieved: (i) Low near-infrared-visible-light (NIR-VIS) transmittance (0.62 %); (ii) Ultraviolet (UV) transmittance of only 0.012 % and UPF value as high as 2000; (iii) Mass attenuation coefficient up to 16.18 cm 2 g −1 and attenuation ratio of 85.74 % (thickness: 4 mm) at 33 keV X-ray energy. Furthermore, porous structure and high specific surface area give the membrane ultralight density (0.36 g cm −3 ), flexibility, and outstanding air permeability (8.5 kg m −2 d −1 ). Even after 2000 bends, it still maintains stable structure and performance. Meanwhile, low thermal conductivity (42.2 mW m −1 K −1 ) and superior temperature resistance (300 °C) enable it to adapt to complex and changing environments. These advantages make the membrane highly promising for radiation protection in medical, industrial, and aerospace applications.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yanfang Li,Kang Xu,Huilin Hu,Lixia Jia,Yizhong Zhang,Ciren Zhuoga,Pengli Yang,Xin Tan,Wanqian Guo,Weichang Hao,Tao Yu,Jinhua Ye
Constructing atomic-level cation vacancies is an effective strategy to modulate the electronic properties of host materials, thus promoting charge transfer and redox reaction kinetics. Herein, ultrathin Bi 24 O 31 Br 10 nanosheets with cationic vacancy was synthesized via an inventive precipitation strategy by adding appropriate arginine. The difunctional arginine can changes the pH of the synthetic system and selectively deprive Bi atoms on the surface to form Bi vacancies through strong affinity between functional groups and cations. The abundant Bi vacancy decrease the Gibbs free energy change and provide channels to promote bulk adsorption of Cr(VI), thus effectively reduces the carrier migration distance during in situ bulk photocatalytic reduction of Cr(VI) and induces the formation of new impurity states to improve the utilization of visible light. Bi vacancy mitigates strong excitonic effects confined by significantly reducing exciton binding energies, thus effectively promote the separation of photo-generated charges and suppress reorganization of photon-generated carrier. Benefiting from these merits, these exclusive V Bi -Bi 24 O 31 Br 10 ultra-thin nanosheets exhibit superior reduction performance for Cr(VI), and the removal rate was more than 90% at universal pH (2–10). This work provides a new idea for the construction of cation vacancies and a feasible method for the removal of Cr(VI) under alkaline conditions.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Hua-Rong Yang,Shan-Shan Li,Chen Yang,Qing-Da An,Shang-Ru Zhai,Zuo-Yi Xiao
Here, we have developed a novel bilayer hollow amphiphilic biosorbent (BHAB-3) with large adsorption capacity, rapid adsorption kinetics, and cost-effective for the removal of Cr(VI) and Cu(II) from aqueous solutions. The synthesis was based on the clever use of freeze-drying to fix the structure, secondary modification of the carboxymethyl cellulose microspheres with polyethyleneimine and cross-linking by glutaraldehyde. The consequences of pH, initial concentration, contact time and temperature on adsorption were investigated. The Langmuir model fits showed that the maximum adsorption capacities of the two target heavy metal ions reached 835.91 and 294.79 mg/g, respectively. Moreover, BHAB-3 was characterized by SEM, FT-IR, TGA, and XPS synergistically, showing that it exhibits a strong complexation ability for Cu(II) and a strong electrostatic effect for Cr(VI). Adsorption and desorption experiments showed only a slight decrease in the adsorption capacity of the BHAB-3 for Cr(VI) and Cu(II) ions after 5 and 26 cycles, respectively. Given the excellent properties of this adsorbent, it is a promising candidate for heavy metal ion removal.
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2020
·Vol. 167
·期 2
·027536
·
IF 3.721
Yajie Cheng,Chengjin Chen,Shengnan Hu,Xuebing Liu,Li Zhang,Wangqiang Huang,Shaodong Song,Lingyun Xia
In this work, BiVO4/Bi-X (X represented the quality of adding NaNH4, X = 0.1, 0.3 and 0.5) are synthesized through two-step hydrothermal methods. The photoelectrochemical (PEC) experiments demonstrate that the PEC properties of BiVO4/Bi-0.3 bear the best PEC performance compared with other materials. Meanwhile, UV–vis Diffuse reflection spectra (DRS) and photoluminescence (PL) also affirm that the Bi metal SPR effect is able to improve the energy conversion efficiency. For this reason, the PEC sensors based on a bifunctional BiVO4/Bi-0.3 are fabricated, which demonstrates a broad linear range from 0.2–118 μM and 0.05–100 μM for sensing ascorbic acid (AA) and Dopamine (DA).
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高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Weijian Xue,Min Li,Yingqing Zhao,Yifan Deng,Ying Li
The direct reduction of solid Bi 2 O 3 to Bi used for a high-performance anode is studied for the first time. Cyclic voltammetry results indicate that the conversion of solid Bi 2 O 3 is a one-step process. Electrolysis measurements using a solid Bi 2 O 3 cathode were carried out at various experimental conditions. X-ray diffraction (XRD) measurements of the electrolytic samples reveal that the solid Bi 2 O 3 can be completed reduced to Bi. The electrolytic Bi obtained at 2.6 V for 6 h achieves a long and steady cycle, a higher specific capacity than 403.2 mAh g −1 , and a higher capacity retention than 95.5 % cycling for even 4000 cycles, as well as an excellent rate capability. The electrochemical deoxidation approach can provide a green and straightforward pathway for producing high-performance sodium-ion batteries anodes.
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高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2018
·
IF 5.16
Min Sang,Sheng Wang,Mei Liu,Linfeng Bai,Wanquan Jiang,Shouhu Xuan,Xinglong Gong
In this paper, a versatile polyvinylidene fluoride/carbonyl iron (PVDF/CI) composite film was prepared by doping magnetic carbonyl iron (CI) particles into piezoelectric polyvinylidene fluoride (PVDF) matrix. Without influencing the piezoelectric structure of PVDF, CI particles enhanced the Young's modulus and maximum tensile strength of composite films. Due to the magnetic driven characteristic, PVDF/CI composite films exhibited distinct magnetic-mechanic-electric coupling properties. The piezoelectric charge signals could be generated by applying the bending deformation or magnetic field . Taking PVDF/CI-10% (CI content was 10 wt%) film as an example, the piezoelectric charges under 2, 4, 6, 8, and 10 mm bending displacement were 3.0, 9.6, 14.9, 18.6, and 24.6 pC respectively. Moreover, when the magnetic field varied from 0 to 600 mT, the generated magneto-electric charges of PVDF/CI-10% film increased from 0 to 676 pC. The quantitative relationship between magnetic field and magneto-electric charges was obtained by the polynomial fitting method and the correlation coefficient was up to 0.97. Owing to the ideal piezoelectricity, excellent stability, light weight and desirable flexibility, PVDF/CI composite films showed promising applications in deformation sensor and magnetic field sensor.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Yunpeng Cao,Xue Zhou,Faming Gao
The investigation of Bi-based metal-organic frameworks (Bi-MOFs) as anode materials has garnered significant attention because of their higher lithium storage capacity. Nevertheless, they are prone to structural collapse when undergoing the process of charging and discharging, resulting in irreversible capacity degradation. In this study, we develop novel Bi-MOF and reduced graphene oxide (RGO) composites named Bi-MOF@RGO-x, where “x” represents the amount of RGO incorporated during the synthesis process. As expected, when used as an anode for LIBs , the Bi-MOF@RGO-15 electrode exhibited an excellent capacity of 400 mAh·g −1 and ultra-long cycling stability of more than 3500 cycles at the current density of 10 A·g −1 (the specific capacity is the same as the second cycle). An interesting Bi-MOF@RGO reconfiguration phenomenon could be observed in that amorphous carbon layers and ultra-small bismuth dots could be obtained after repeated charging/discharging. Meanwhile, the amorphous carbon layers could uniformly wrap around the in-situ deposited bismuth dots to act as a buffer against volume fluctuations during bismuth lithiation and delithiation. The in-situ deposited bismuth dots had a shorter Li + transport path, facilitating faster Li + transport to obtain an excellent rate performance. This reconfiguration did not cause the degradation of battery performance, but on the contrary, was an important reason for obtaining high-performance MOF anodes. This study demonstrates that the reconfiguration of Bi-MOF is a favorable anodic conversion process, providing different insights into studying anodes for MOFs.
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高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Lifeng Jiang,Shuyue Tan,Rongchun Chen,Jingwei Xian,Hongrui Li,Donghu Zhou,Huijun Kang,Zongning Chen,Enyu Guo,Tongmin Wang
Grain boundary (GB) engineering includes grain size and GB segregation. Grain size has been proven to affect the electrical properties of Mg3(Sb, Bi)2 at low temperatures. However, the formation mechanism of GB segregation and what kind of GB segregation is beneficial to the performance are still unclear. Here, the Ga/Bi cosegregation at GBs and Mg segregation within grains optimize the transport of electrons and phonons simultaneously. Ga/Bi cosegregation promotes the formation of Janus-like structures due to the diverse ordering tendencies of liquid Mg3Sb2 and Mg3Bi2 and the absence of a solid solution of Ga/Bi. The Janus-like structure significantly reduces the room-temperature lattice thermal conductivity by introducing diverse microdefects. Meanwhile, a coherent interface between the nano Mg segregation region and the matrix is formed, which reduces the thermal conductivity without affecting the carrier transport. Furthermore, the band structure calculations show that Ga doping introduces the resonance level, increasing the Seebeck coefficient. Finally, the lattice thermal conductivity reaches ∼0.4 W m–1 K–1, and a high average ZT of 1.21 between 323 and ∼773 K is achieved for Mg3.2Y0.02Ga0.03Sb1.5Bi0.5. This work provides guidance for improving the thermoelectric performance via designing cosegregation.
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高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Baoyang Liu,Wang Yao,Peng Qin,Jun Qian,Xuli Ding
To cope with the charging-time and driving-range issues of the power batteries, a composite and phase modification tactics is manifested to increase the cycling stability and rate capability of the Sb 2 SnO 5 (SSO) anode for sodium-ion batteries (SIBs). The as-fabricated Bi/SSO@PCFs composite with Bi nanocrystals homogeneously dispersed on and around the SSO surface is prepared by an electrospinning method . The excellently dispersed Bi nanocrystals realize an effective contact with SSO, which effectively lowers the electron conduction barriers and promotes the sodium ion release as well as the transport upon the desodiation/sodiation process, increasing the rate capacity and cycle stability of the SSO anode. Importantly, a high-speed ion channel is constructed through the special layered Bi, and SbBi phase. The prepared Bi/SSO@PCFs anodes deliver a high rate capacity up to 25 A g −1 and long cycle life of 5000 cycles with 83 % capacity retention rate, sustaining an average capacity loss of 0.0034 % for each cycle. Particularly, the intercalation of Na + between layer-structure Bi and SbBi galleries provides a good basis for excellent cycle performance due to small volume change and unobstructed ion channels. This finding provides an effective strategy to establish ion transport highways, which essentially increase the rate-capacity and cycle-life of the SSO-based anodes for SIBs.
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ChemistrySelect
·
2025
·Vol. 10
·期 12
·e202500499
·
IF 2
Tianzhu Shao,Qi Wang,Jiahao Wei,Gonggang Sun,Xinbao Li
Graphical The study focuses on the synthesis of SCR catalysts with high activity and excellent alkali resistance. The redox performance and surface acidity of VWTi are enhanced and the atomic valencies is optimized through the doping of Ce and Bi. Therefore, the catalytic activity of the catalyst is significantly enhanced and excellent catalytic activity is maintained even after KCl poisoning. Ce-doped V 2 O 5 -WO 3 /TiO 2 (CeVWTi) and its subsequent modifications have been recognized as effective catalysts for the selective catalytic reduction of NO. Herein, CeVWTi catalysts doped with varying amounts of bismuth sulfate (Bi 2 (SO 4 ) 3 ) were synthesized and evaluated for their activity and alkali resistance. These catalysts were characterized using XPS, BET, SEM, H 2 -TPR, NH 3 -TPD, and XRD techniques. The optimal doping level of Bi 2 (SO 4 ) 3 was 1 wt.%. The NO conversion rate of the catalyst co-doped with Ce and Bi was 71.6% under the reaction conditions of 300 °C, gas hour space velocity (GHSV) = 200,000 h −1 with a gas composition of 550 ppm NO, 550 ppm NH 3 , 5.6% O 2 , and N 2 as the balance. The NO conversion efficiency of the Bi 0.01 CeVWTi catalyst was maintained at 90.7% after the addition of 1 wt.% KCl poisoning under the reaction conditions of 350 °C, GHSV = 200,000 h −1 , 550 ppm NO, 550 ppm NH 3 , 5.6% O 2 , and N 2 as the balance. Characterization showed that, despite the reduction in the specific surface area of the catalyst and some acidic sites due to Bi doping, the redox performance of Bi 0.01 CeVWTi was significantly enhanced. The excellent redox performance was maintained even after KCl poisoning.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Zelai Cheng,Yulan Jing,Xi Wang,Feng Qiao,Xiuling Yang,Ying Chen,Mingshan Qu,Hua Su
The escalating demand for miniaturized high-frequency circulators in radar and satellite systems necessitates ferrite materials that concurrently possess a high saturation magnetization (4π M s ), a narrow ferromagnetic resonance linewidth ( ΔH ), and a high dielectric constant ( ε r ). In this study, a defect-engineered Bi 1.4 Ca 0.3 Zr 0.3 Y 1.3 Fe 4.6−x In 0.1 O 12−δ garnet ferrite was synthesized, in which synergistic Zr⁴⁺/In³⁺ dual-site doping and controlled Fe-vacancies improved magnetic performance. At optimal Fe-deficiency (x = 0.1), the material achieved a high 4π M s of around 2001 G, enabling C-X band operation. Simultaneously, it attained narrow ferromagnetic resonance linewidth ( ΔH ≈ 112 Oe) through reduced magnetocrystalline anisotropy (| K 1 |) and an enhanced dielectric constant ( ε r ≈ 26.2) via the “rattling” effect that compensated for vacancy-induced polarization loss. A straight-circuit microstrip circulator based on this ferrite ( r 0 = 2.14 mm, r 1 = 7.76 mm) was operated in the bandwidth from 4.23 to 9.85 GHz. It exhibited insertion loss ( S 21 ) better than −0.5 dB and isolation/return loss ( S 11 / S 12 ) below −20 dB. A curved-microstrip redesign further reduced the substrate area to 28.7% of the original while maintaining operation from 4.34 to 9.36 GHz, demonstrating exceptional potential for compact C-X band circulators.
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