Science China-Chemistry
·
2017
·Vol. 60
·期 9
·1191-1196
·
IF 4.132
Ji Shaobo,El Mard Hicham,Smet Mario,Dehaen Wim,Xu Huaping
Macrocycles possess potential applications in supramolecular chemistry and biosystems. Thus development of new kinds of macrocycles is of significance. Herein, novel macrocycles containing Se–Se/Se–S bonds were synthesized via transformation between selenium related dynamic covalent bonds. A monomer containing two ebselen moieties was synthesized ( M1 ). The Se–N bonds in M1 were reduced by dithiothreitol, forming Se–S linked dimer ( D1 ). To realize the transformation from Se–S bonds to Se–Se bonds, guest molecules were added as template, triggering the formation of Se–Se linked dimer ( D2 ). The formation of these two new kinds of macrocycles was determined by 1 H NMR and 77 Se NMR, and the necessity of guest molecules was also confirmed. The introduction of ebselen moieties and Se–S bonds or Se–Se bonds into macrocycles may endow it with new responsiveness and bioactivities, as well as new types of host-guest chemistry.
研究领域:
超分子化学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2017
·
IF 4.784
Shoushuai Gao,Yi Zhang,Jianping Ao,Shuping Lin,Zhaojing Zhang,Xiuling Li,Dongxiao Wang,Zhiqiang Zhou,Guozhong Sun,Fangfang Liu,Yun Sun
The direction of Se-Mo-Se sheets to the Mo film is crucial for the thickness of Mo(S,Se) 2 and the electrical conductivity , so as the back contact of Cu 2 ZnSn(S,Se) 4 solar cells. In this study, the preferred orientation of Mo(S,Se) 2 film changes from (100) peak to (103) peak, i.e. from perpendicular to the substrate to tilted to the substrate for Se-Mo-Se sheets as the roughness decrease of Mo back contact layer. The Se vapor can easily diffuse through the channels between Se-Mo-Se sheets when the formed Mo(S,Se) 2 layer is (100) peak preferred with Se-Mo-Se sheets perpendicular to the substrate, and thus excessively thick Mo(S,Se) 2 will be formed. Whereas, the Se-Mo-Se sheets are tilted to substrate when the preferred orientation of Mo(S,Se) 2 is (103) peak. The tilted Se-Mo-Se sheets can act as a natural Se diffusion barrier to suppress the Se vapor diffusion through the already formed Mo(S,Se) 2 layer to further selenize the remaining Mo film, and also can provide a good electrical conductivity. As a result, the thickness of Mo(S,Se) 2 sharply decreased from 1500 nm to 200 nm with the surface morphology change of Mo back contact, which resulting in the decrease of series resistance of Cu 2 ZnSn(S,Se) 4 solar cells from 2.94 Ω cm 2 to 0.49 Ω cm 2 , and the increase of conversion efficiency of Cu 2 ZnSn(S,Se) 4 solar cells from 6.98% to 9.04%.
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
KERNTECHNIK
·
2023
·Vol. 88
·期 5
·556-565
·
IF 0.5
Qifeng Jiang,Weigang Liu,Yuxin Liao,Haonan Li,Junhan Li,Jiahui Feng,Zimin Zhang,Yuzhen Sun,Yuxin Chen,Jiachen Guo,Xuebin Su,Rong Hua
Bentonite exhibits obvious geological characteristics in different areas, and its chemical composition varies. To investigate the impact of these variations on the adsorption of Se(IV), the chemical structures and elemental contents of three types of bentonites were characterized using FTIR and XRF. By conducting a series of experiments and fitting the results with the kinetic adsorption model and the isothermal adsorption model, it was discovered that bentonite exhibits diverse adsorption modes for Se(IV). In acidic environments, the adsorption mode primarily involves forming an outer-sphere complex, whereas in neutral and alkaline environments, the primary mode is to form an inner-sphere complex. Zhi-Shin bentonite, which has low alumina content and high iron oxide content, demonstrates poor adsorption effectiveness on Se(IV) at low temperatures (less than 45 °C), but exhibits good adsorption effectiveness at high temperatures (more than 50 °C). Conversely, bentonite with high alumina content and low iron oxide content demonstrates the opposite effect. Furthermore, for bentonite with high iron oxide content, Se(IV) will form more inner-sphere complexes with iron oxide, and the adsorption behavior is not easily affected by changes in ionic strength and pH.
研究领域:
环境科学
·
地质学
✓ 已验证
DOI
高影响因子
Journal of Materiomics
·
2022
·
IF 8.589
Xuedi Zhang,Jin Chen,Han Zhang,Pengfei Zhu,Rong Wang,Fu Li,Bo Li
Bi 2 Te 3 -based materials were prepared by direct ink writing (DIW) 3D printing and their microstructure and thermoelectric properties were investigated with an emphasis on the effect of the content of DMF and Te/Se addition. As the mass ratio of DMF in the composition increased from 6.5% to 8.0% (in mass), the electrical conductivity deteriorated because of the corresponding increased porosity and organic remains in the samples. However, the volatilization of DMF would reduce the fluidity of the slurry. Thus, thermoelectric slurry with 7.0% DMF is the most suitable mass ratio for 3D printing. Additionally, adding Te in the p-type Bi 0.4 Sb 1.6 Te 3 and adding Se in the n-type Bi 2 Te 2.6 Se 0.4 have significantly improved their electrical conductivity due to the increased carrier concentration and mobility. Combining with the moderate Seebeck coefficient (∼200 μV/K), high power factors with ∼802 μW·m −1 ·K −2 and 1266 μW·m −1 ·K −2 were obtained for the n-type Bi 2 Te 2.6 Se 0.4 +10%Se and p-type Bi 0.4 Sb 1.6 Te 3 +7%Te, respectively, which result in the final relatively high zT values of 0.68 at 573 K and 0.56 at 330 K for n-type and p-type 3D-printed samples.
研究领域:
材料科学
·
热电技术
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2025
·
IF 2.6
Yong-Hai Yuan,Feng Yang,Qiu Zhang,Qinghong Xu,Meilan Wen
This study focuses on comparing the performance of pneumatic nebulization (PN), hydride generation (HG), and photochemical vapor generation (PVG) sampling modes coupled with inductively coupled plasma mass spectrometry (ICP-MS) for the determination of Se and Te in geological samples. ICP-MS operating parameters for each sampling mode, such as RF power, flow rate of collision gas, and sampling depth, were optimized. The introduction efficiency of Se and Te in PN mode was about 4.71% and 4.58% respectively, with the best reproducibility. HG mode had the highest introduction efficiency (57.01% for Se and 53.02% for Te), but the poorest reproducibility. PVG mode showed a good balance between efficiency and reproducibility, with introduction efficiencies of 45.38% for Se and 38.84% for Te, and lower limits of detection (LODs) of 0.001 μg·L-¹ for both Se and Te. Analysis of 14 geological certified reference materials (CRMs) indicated that for samples with Se > 0.1 μg·g-¹ and Te > 0.05 μg·g-¹, both PN and PVG sampling modes can obtain satisfactory results, and PN mode is more convenient. For samples with Se ≤ 0.1 μg·g-¹ and Te ≤ 0.05 μg·g-¹, HG or PVG sampling modes are recommended after enrichment pretreatment. This research provides a more precise and reliable method selection basis for analyzing Se and Te in geological samples at different concentration levels.
研究领域:
分析化学
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地球化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2020
·Vol. 324
·期 2
·903-911
·
IF 1.137
Wu Hao,Huang Wei,Duan Zhiqin,Luo Mingbiao,Wang Zhifen,Hua Rong
For the first time in laboratory, diffusion parameters of Se(IV) in the clay of Chinese Tamusu region(TMS clay) against compacted density, ionic strength and pH value were obtained by capillary method. Diffusion process can be Simplified by using one-dimensional semi-infinite medium diffusion model. The results show a good similarity with the international literature and meet the internationally recognized range of 10 −9 –10 −12 . This work will provide data support and theoretical references for the pre-selection of clay rock sites in China’s high-level radioactive waste deep geological repository.
研究领域:
环境科学
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地质学
·
核废料管理
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2018
·
IF 0
Junjie Fu,Jie Fu,Qingwen Tian,Houlin Wang,Fengming Zhao,Jun Kong,Xiangyun Zhao,Sixin Wu
The Se content in a Cu2ZnSn(S, Se)4 absorber layer has a significant impact on the electronic properties, but it is rather challenging to control the Se/(S + Se) ratio due to a complicated selenization process. Here, a low-toxicity thiol/amine-based solution process was developed to tune the Se content in a Cu2ZnSn(S, Se)4 absorber layer to an optimal value by ingeniously controlling the SeO2 in the precursor solution. We demonstrated that the crystal growth and the band gap of Cu2ZnSn(S, Se)4 thin films are affected by the Se/(S + Se) ratio. By this approach, the open-circuit voltage deficit (Voc,def) of the device was effectively decreased, and the short-circuit density (Jsc) and fill factor (FF) were remarkably improved; thus, the power conversion efficiency of the Cu2ZnSn(S, Se)4 solar cells was successfully increased from 5.6% to 9.7% for the optimal band gap (Eg = 1.13 eV).
研究领域:
材料科学
·
太阳能电池技术
✓ 已验证
产品关联
DOI
JOURNAL OF RAMAN SPECTROSCOPY
·
2022
·Vol. 54
·期 2
·191-200
·
IF 2.727
Yuhao Xie,Siwei Yang,Shenghua Zhou,Jiazhen Liu,Shuai Zhao,Shangzhong Jin,Qiang Chen,Pei Liang
Raman spectroscopy is widely used in the identification of substances. Raman spectra contain molecular information from various components and interference from noise and instruments. Therefore, using Raman spectroscopy to identify components is still challenging, especially for substances with high similarity. In this study, a class of highly similar products (methanol and ethanol) and a multicomponent mixture of propanol and water were tested using a portable Raman spectrometer. They are divided into 11 categories according to the volume fraction ratio. A total of 5,060 groups of Raman spectrum data were obtained, constituting the data set of this study. The deep neural network structure adopted in this study is based on ResNet architecture, on which the SE module in the attention mechanism is added, which increases the weight of some spectral features and achieves significant performance improvement. Finally, SE-ResNet achieves a recall of 0.95, a precision rate of 0.95, a Micro-F1 of 0.95, and an accuracy rate of 99.20%.
研究领域:
分析化学
·
人工智能
·
光谱学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2015
·Vol. 4
·期 3
·581-588
·
IF 4.696
Sheng Cao,Wenyu Ji,Jialong Zhao,Weiyou Yang,Chengming Li,Jinju Zheng
Recently, Cu-doped ternary chalcogenide quantum dots (QDs) have attracted extensive attention due to their large Stokes shift and tunable photoluminescence (PL) behavior in the visible and near-infrared (NIR) spectral range, and particularly for their remarkably lower toxicity than their Cd-based counterparts. However, there still remain material- and fabrication-related obstacles in realizing high-performance Cu-doped QDs, which limit their promising applications in light-emitting devices and bio-labeling. In the present study, we report the facile synthesis of high-qualified Cu-doped Zn–In–Se QDs via a hot injection approach, using a heterogeneous dispersion of Se in octadecene (ODE) as a “green” Se precursor. With variation of the ratios of Zn to In, the obtained Cu-doped Zn–In–Se QDs exhibited composition-tunable PL emissions over the most visible spectral window (ca. 565–710 nm) with a PL quantum yield (QY) up to 38% after coating ZnSe shells, which is the highest one ever reported in this system. Furthermore, we report, for the first time, the exploration of QD light-emitting diodes (QD-LEDs) based on the Cu-doped Zn–In–Se QDs as the active layer, which had a maximum luminance of 320 cd m−2 and a luminous efficiency (LE) of 0.97 cd A−1 (at 98 cd m−2), suggesting their promising potential for application in optoelectronic devices.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2023
·Vol. 13
·期 24
·7046-7058
·
IF 5
Wei Jin,Dekang Liu,Liyuan Zhang,Qian Sun,Yishan Wang,Enzhou Liu,Xiaoyun Hu,Hui Miao
Titanium dioxide (TiO2), a conventional n-type semiconductor, was widely used in photocatalysis, electrocatalysis and photoelectrocatalysis due to its good UV absorption and stable physical and chemical properties. However, its wide band gap and low oxygen reaction (OER) activity limited its application in photoelectrochemical (PEC) water splitting. In this work, we successfully constructed type-II Sb2(S,Se)3@TiO2 core–shell heterojunctions. Antimony sulfide selenide (Sb2(S,Se)3) was a quasi-one-dimensional light-absorbing material with an adjustable band gap (1.1–1.8 eV), which broadened the TiO2 light absorption range and effectively promoted the photogenerated carrier separation, transportation and utilization. Of particular note, novel Sb2(S,Se)3 nanospheres (NSPs) (ca. 69 nm) were in situ grown inside the tubes attributed to the unique space-confinement effect of TiO2 nanotubes (NTs). The IPCE value for Sb2(S,Se)3@TiO2 at 734 nm was 10.808% compared to 0.030% for TiO2. The separation efficiency and injection efficiency increased from 2.48% and 31.62% to 4.90% and 36.48%, respectively. The onset potential was moved negatively by 60 mV, and the maximum photocurrent density of 1.53 mA cm−2 at 1.23 V vs. RHE was 13.9 times higher than that of TiO2 (0.11 mA cm−2). This work provided a new idea for the application of TiO2 in the field of PEC water splitting.
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
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2021
·Vol. 329
·期 1
·149-158
·
IF 1.371
Sun Yuzhen,Zhang Hui,Lee Chuan-Pin,Luo Mingbiao,Hua Rong,Liu Weigang,Kong Jie,Hu Yanqin
For the first time in laboratory, the diffusion behavior of Se(IV) in Tamusu clayrock core was studied by means of through-diffusion method. The effects of pH, ionic strength and humic acid on the diffusion behavior of Se(IV) in clayrock were studied. The effective diffusion coefficient, distribution coefficient and rock capacity factor value were obtained. The diffusion mechanism of radionuclide in Tamusu clayrock is discussed, which can provide experimental data support and theoretical references for the pre-selection of clayrock sites and safety assessment in China’s high-level radioactive waste deep geological repository.
研究领域:
放射生物学
·
地质学
·
核废料管理
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2022
·
IF 5.545
Zhao Benhui,Deng Yueqing,Cao Lei,Zhu Jichun,Zhou Zhengji
Kesterite-structured Cu2ZnSn(S,Se)4 (CZTSSe) thin film photovoltaics have attracted considerable attention in recent years because of its low-cost and eco-friendly raw material, as well as high theoretical conversion efficiency. However, its photovoltaic performance is hindered by large open-circuit voltage (VOC) deficiency due to the presence of intrinsic defects and defect clusters in the bulk of CZTSSe absorber films. The doping of extrinsic cation to the CZTSSe matrix was adopted as an effective strategy to ameliorate defect properties of the solar cell absorbers. Herein, a novel Se&Sb2Se3 co-selenization process was employed to introduce Sb into CZTSSe crystal lattice. The results reveal that Sb-doping plays an active role in the crystallization and grain growth of CZTSSe absorber layer. More importantly, one of the most seriously detrimental SnZn deep defect is effectively passivated, resulting in significantly reduced deep-level traps and band-tail states compared to Sb free devices. As a result, the power conversion efficiency of CZTSSe solar cell is increased significantly from 9.17% to 11.75%, with a VOC especially enlarged to 505 mV from 449 mV. This insight provides a deeper understanding for engineering the harmful Sn-related deep defects for future high-efficiency CZTSSe photovoltaic devices.
研究领域:
材料科学
·
光伏技术
·
半导体物理
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）