JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2021
·
IF 8.067
Jun Guo,Yu-Ke Zhu,Lin Chen,Zi-Yuan Wang,Zhen-Hua Ge,Jing Feng
Bi 2 S 3 -based alloys are considered promising thermoelectric materials due to their large Seebeck coefficient and low lattice thermal conductivity . However, low electrical conductivity usually leads to poor electrical transport properties, which seriously restricts their further application in thermoelectric refrigeration and/or power generation. In this work, Bi 2 S 3 with high electrical transport properties is synthesized hydrothermally via Se and Cl co-doping. The maximum electrical conductivity value of 483 S cm −1 was obtained for the Bi 2 S 2.4 Se 0.4 Cl 0.20 sample at room temperature. The significant improvement of electrical conductivity gives rise to a high average power factor of 411 μW m −1 K −2 during the measuring temperature range and a peak value of 456 μW m −1 K −2 at 673 K. Benefiting from the largely improved electrical transport properties, a superior ZT value of approximately 0.66 and ZT ave . of 0.36 were obtained for Bi 2 S 2.4 Se 0.4 Cl 0.20 , and the theoretically calculated conversion efficiency reached 5.7%. The results indicate that Bi 2 S 3 is a promising candidate for thermoelectric applications at medium temperatures.
研究领域:
材料科学
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热电学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
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IF 6.2
Lingyao Zou,Lu Gan,Wenli Song,Chunying Rong,Lishan Yang,Liping Yu,Zhongyun Ma,Shixun Lian
The rapid development of highly durable electric vehicles has put forward higher requirements for lithium-ion batteries. Li 4 Ti 5 O 12 (LTO) is widely studied owing to its long service life and safety. However, owing to their low electrical conductivity and diffusion, lithium ions have limited practical applications. In this study, Co-Cl co-doped LTO/TiO 2 diphase (LTOT) nanosheets were prepared via the hydrothermal method . The synergistic effect of Co-Cl co-doping reduced the charge-transfer resistance of LTOT and increased the lithium-ion diffusion coefficient , thereby improving the dynamic behavior of the electrode material, which further enhances the rate capability and cycle performance of LTOT. The optimized LTOT:Co-Cl composite exhibited excellent cycle performance and rate capability (the ninth cycle reversible capacities were 253.8, 222.2, 200.1, 185.7, 169.9, 161.3, and 146.3 mAh·g −1 at the current density of 1, 2, 5, 10, 20, 30, and 50 C (1 C = 175 mA·g −1 ) rate, respectively). In addition, LTOT:Co-Cl maintained a capacity of 120 mAh·g −1 after 5000 cycles at 50 C with a retention rate of 83 %, indicating that the average decay rate per cycle is only 0.003 % during the long charge/discharge process.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
FOOD CHEMISTRY
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2019
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IF 5.399
Xiupei Yang,Jing Xu,Na Luo,Fenglin Tang,Maoxue Zhang,Bin Zhao
Chemical doping with heteroatoms was employed to prepare N,Cl co-doped fluorescent carbon dots (N,Cl-FCDs) which may be designed for the detection of tartrazine. Using urea as the N source and FeCl 3 · 6H 2 O as the Cl source, N,Cl-FCDs were synthesized by hydrothermal method with carbon dots prepared from aloe. Compared with pure carbon dots (CDs), N,Cl-FCDs resulted in dramatic improvement in the fluorescence properties and surface physical chemical properties. The fluorescence quantum yield of the N,Cl-FCDs was as high as 60.52%. As an effective fluorescence probe for tartrazine, a good linear relationship between N,Cl-FCDs and tartrazine was constructed at the concentration range from 0.1 to 30 μM with a detection limit of 48 nM based on the mechanism of fluorescence resonance energy transfer (FRET). The proposed fluorescent probe method was successfully applied to detect tartrazine in beverages, which is expected to have a potential application in the field of food analysis.
研究领域:
食品科学
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分析化学
✓ 已验证
DOI
PubMed
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 27
·16805-16813
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IF 3.361
Qinhong Yin,Mengtao Wang,Dong Fang,Yanqin Zhu,Lihua Yang
In the present study, new N,Cl co-doped carbon dots (N,Cl-CDs) based on deep eutectic solvent (DES) were fabricated by a facile hydrothermal process. This fluorescent probe exhibited a good quantum yield of 14% and was applied for the sensitive and selective quantification of morphine in foods. In addition, the influence of solution pH, interaction time, system temperature, interfering substances and analogues on the determination was also investigated. Under the optimized conditions, the luminescence intensity of carbon dots increased linearly with the addition of morphine in the concentration range of (0.15–280.25) μg mL−1 (R2 > 0.9969) and the limit of detection (LOD) of 46.5 ng mL−1. Based on these results, it is suggested that N,Cl-CDs is a promising fluorescent probe for sensitive and selective quantification of morphine in foods.
研究领域:
分析化学
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食品科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CRYSTAL GROWTH
·
2024
·
IF 1.7
Jingyi Yu,Hao Sun,Cong Zheng,Weiwei Jiang,Nan Wang,Zhiqiang Li,Sumei Wu,Hualong Tao,Tingting Yao,Hualin Wang,Shimin Liu,Chaoqian Liu,Wanyu Ding,Zhihua Zhang
Pure TiO 2 , Sn/Cl co-doped TiO2 and Sn/Cl co-doped TiO 2 -ZnO were fabricated and compared by a novel one-pot method to improve the photocatalytic performance of pure TiO2, which accomplishes the construction of heterojunctions simultaneously with doping by volatile solid solution. TG-DSC, XRD, FTIR, XPS, SEM, EDS, TEM, SAED, UV–Vis, PL and EIS were characterized to investigate the influence mechanism of Sn/Cl co-doping and ZnO content (0, 25, 50, 75, and 100 mol.%) on the thermal effect, crystal structure, morphology, composition, charge transfer behavior and photocatalytic performance of samples. Results indicate that ZnO appears and SnO2 disappears simultaneously with anatase TiO2 as the main phase by increasing ZnO content, and the morphology is changed from irregular sphere to sphere-sheet and sphere-plate correspondingly. The photocatalytic degradation efficiency first increases and then decreases, and achieves the maximum value of 73 % by SCT/Z50 which has sphere-sheet heterostructure containing more hydroxyl radicals, under 15 W weak-UV light irradiations for 3 h using methyl orange (MO) as pollutant. The excellent photocatalytic performance is attributed to the structural and morphological effects of Sn/Cl co-doping and ZnO introduction, which can increase the electron-hole separation efficiency. The optimized composition also has great potential in practical photocatalytic application due to the commercial advantage that ZnO is much cheaper than TiO2.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Yue Zhao,Yujie Xiao,Xian Yang,Xue Zhang
This study presented the synthesis of phosphorus (P) and chlorine (Cl) co-doped carbon quantum dots (P/Cl-CQDs) derived from Epimedium brevicornu Maxim. and established a simple and effective chemiluminescence (CL) system for detecting Sulfacetamide (STM) and Sulfadimethoxine Sodium Salt (STX). Employing traditional Chinese medicine Epimedium brevicornu Maxim. as a green precursor material, (NH 4 ) 2 HPO 4 and NH 4 Cl were utilized as dopants for P and Cl, respectively. The P/Cl-CQDs was synthesized through a one-step hydrothermal method exhibited excellent CL properties, effectively catalyzing the luminol system and markedly amplifying its CL intensity. Both STM and STX were observed to inhibit the CL intensity of the luminol-(P/Cl-CQDs) system. Based on this, a novel CL method combining flow injection technique was established for the detection of STM and STX. Under optimal conditions, the method demonstrated the capability to detect STM in the range of 1–400 × 10 −6 mol/L, with a limit of detection (LOD) of 0.34 × 10 −6 mol/L and a relative standard deviation (RSD) of 1.29 %, and STX within the range of 5–280 × 10 −6 mol/L, with a LOD of 0.16 × 10 −6 mol/L and an RSD of 1.23 %. This method successfully determined the content of STM and STX in pork, with spike recoveries ranging from 100.0 % to 103.8 % for STM and from 98.0 % to 102.3 % for STX.
研究领域:
分析化学
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材料科学
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环境科学
·
药物分析
✓ 已验证
产品关联
DOI
高影响因子
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