ACS Omega
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2020
·
IF 2.87
Yi Cao,Peiyuan Tang,Wenfeng Qiu,Tong Zhao
Flexible all-solid-state supercapacitors have drawn more attention owing to the rapid growth of wearable electronic equipments. Herein, we have succeeded in synthesizing a series of Y-doped lanthanum titanate flexible self-supporting films (LSF-x, 0.1 ≤ x ≤ 0.5) and investigating the change of microstructures, morphological characteristics, and lattice structures of these films affected by different Y-doping contents. To further determine the optimum Y-doping content, we have explored the electrochemical properties of working electrodes prepared by LSF-x (0.1 ≤ x ≤ 0.5) samples as the main active material. As the LSF-0.2 electrode has the best areal capacitance of 1.3 F·cm–2 at 2 mA·cm–2, we use the LSF-0.2 electrodes and PVA–Na2SO4 gel to fabricate a flexible all-solid-state supercapacitor device. This device has a high areal capacitance of 255.9 mF·cm–2 at a current density of 2 mA·cm–2 with a high cell voltage of 2.1 V, while the corresponding energy density is 156.8 μWh·cm–2 with a power density of 2.1 mW·cm–2. Moreover, it also shows a long cycling life and outstanding flexibility. Therefore, the LSF-0.2 sample can be used as an excellent energy-storage material for a wearable electronic device.
研究领域:
材料科学
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能源技术
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纳米科技
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DOI
高影响因子
Small
·
2016
·Vol. 13
·期 2
·1601769
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IF 8.315
Guang Yang,Hongwei Lei,Hong Tao,Xiaolu Zheng,Junjie Ma,Qin Liu,Weijun Ke,Zhiliang Chen,Liangbin Xiong,Pingli Qin,Zhao Chen,Minchao Qin,Xinhui Lu,Yanfa Yan,Guojia Fang
Despite the rapid increase of efficiency, perovskite solar cells (PSCs) still face some challenges, one of which is the current–voltage hysteresis. Herein, it is reported that yttrium-doped tin dioxide (Y-SnO 2 ) electron selective layer (ESL) synthesized by an in situ hydrothermal growth process at 95 °C can significantly reduce the hysteresis and improve the performance of PSCs. Comparison studies reveal two main effects of Y doping of SnO 2 ESLs: (1) it promotes the formation of well-aligned and more homogeneous distribution of SnO 2 nanosheet arrays (NSAs), which allows better perovskite infiltration, better contacts of perovskite with SnO 2 nanosheets, and improves electron transfer from perovskite to ESL; (2) it enlarges the band gap and upshifts the band energy levels, resulting in better energy level alignment with perovskite and reduced charge recombination at NSA/perovskite interfaces. As a result, PSCs using Y-SnO 2 NSA ESLs exhibit much less hysteresis and better performance compared with the cells using pristine SnO 2 NSA ESLs. The champion cell using Y-SnO 2 NSA ESL achieves a photovoltaic conversion efficiency of 17.29% (16.97%) when measured under reverse (forward) voltage scanning and a steady-state efficiency of 16.25%. The results suggest that low-temperature hydrothermal-synthesized Y-SnO 2 NSA is a promising ESL for fabricating efficient and hysteresis-less PSC.
研究领域:
材料科学
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光伏技术
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纳米技术
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半导体器件
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DOI
高影响因子
Journal of Physical Chemistry C
·
2017
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IF 4.536
Dongxu Zhu,Aiwei Tang,Qinghua Kong,Bin Zeng,Chunhe Yang,Feng Teng
Ternary alloyed Cu2–xSySe1–y nanocrystals (NCs) were synthesized by using a simple and phosphine-free colloidal approach, in which sulfur powder and 1-dodecanethiol (DDT) were used as sulfur sources. In both cases, the crystal phase transformed from cubic berzelianite to monoclinic djurleite structure together with the morphology evolution from quasi-triangular to spherical or discal with an increase of sulfur content. Accordingly, the near-infrared (NIR) localized surface plasmon resonance (LSPR) absorption of the as-obtained sulfur-rich NCs exhibited obvious red-shift of wavelength and widening of absorption width. When the sulfur powder was chosen as sulfur sources, the LSPR wavelength of the as-obtained alloyed Cu2–xSySe1–y NCs could be tuned from 975 to 1230 nm with a decrease of selenium content in the NCs. In contrast, the region of the red-shift could be up to 1250 nm for the alloyed NCs synthesized by incorporation of different DDT dosage into the reaction system. The different sulfur sources and the electron donating effects of the DDT as a ligand played an important role in the LSPR absorption tuning. This deduction could be testified by the post-treating the quasi-triangular Cu2–xSe NCs with DDT under different temperatures and over different reaction time, which exhibited a red-shift of LSPR wavelength up to 450 nm due to coordination of DDT to Cu atoms on the NC surface while incorporating some sulfur anions into the lattice. This study offers a convenient tool for tuning the LSPR absorption of copper chalcogenide NCs and makes them for application in biological and optoelectronic fields.
研究领域:
纳米材料
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等离激元学
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胶体化学
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光电子学
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材料科学
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
·
IF 24.319
Na Ye,Pengcheng Zhao,Xiaoying Qi,Riguang Zhang,Binhang Yan,Wenchao Sheng,Zhao Jiang,Tao Fang
Engineering high-performance inexpensive TaN-modified Pd-based nanostructures for alkaline methanol oxidation reaction(MOR) has attracted extensive attention, yet the related enhancement mechanism of TaN for MOR remains lacked. The core-shell like Pd 3 Ni 1 -TaN/C catalyst decorated with Ni(OH) 2 /NiOOH that contains highly dispersed Ni sites and nitrogen defects has been fabricated for the first time. The unsaturated coordination environment and core-shell like morphology of Pd 3 Ni 1 -TaN/C bring fruitful active sites and a down-shifted d -band center, making it a highly-efficient electrocatalyst for alkaline MOR (17.3-fold that of commercial Pd/C). Besides the electronic effects and surface defect sites of Pd 3 Ni 1 -TaN/C, TaN also helps MOR proceed via HCOO ad pathway (non-CO) accompanied by enhanced OH adsorption induced by the addition of Ni. DFT(Density Functional Theory) calculations also further confirm the energy barrier of the formation of HCOO ad intermediate and desorption energy of CO on Pd 3 Ni 1 -TaN/C are reduced. The introduction of Ni species and nitrogen vacancies enhances the CO tolerance evidently.
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高影响因子
MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Lina Wang,Xiangbiao Zeng,Li Zhang,Ying Yu,Bixia Lin,Yumin Wang,Manli Guo,Yujuan Cao
Herein, a novel filed-free electrochemical sensor based on inverted Y-type DNA conformation was developed for the ultrasensitive determination of tetracycline (TC). In this sensor, a ferrocene was immobilized on a DNA strand near the interface and showing a signal as reference. Meanwhile, a methylene blue (MB) was modified on a DNA vertical away from the interface, presenting a little signal. When the target TC attracted the aptamer, the DNA modifying MB was released, and then exchanged another DNA near the interface via toe-hold strand displacement effect. This caused an obvious enhancement of the MB signal, and achieved a sensitive response to the TC amount. In comparison to other DNA sensors based on field-confined assembling mode, this sensor exploited the transform of self-structure to make signal response, which avoids the steric hinerance effect and achieving field-free conversion. Meanwhile, the immobile ferrocene provided a reference proportion, reducing the influence of nonspecific signal on measurement accuracy. The followed assays demonstrated when the base-pairs on the straight side were 1.5-fold to that on the hypotenuse, the strand transferring efficiency and signal response were optimal. It exhibited a linearity of 1.0 × 10 -1 –1.0 × 10 3 nM for TC with a detection limit of 28.4 pM. In practical assay, the measured result was matched to that of the contrast method. Meanwhile, the recovery rates ranged from 98.0% to 103.0% with the RSD of 1.4%∼2.5%, respectively. Indicating an expectant application prospect of the proposed sensor in antibiotic monitoring.
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INORGANIC CHEMISTRY
·
2021
·
IF 5.165
Shuang Yu,Kai Yue Zhang,Jin Xiao Li,Yao Xiao,Li Xian Sun,Feng Ying Bai,Yong Heng Xing
Three new metal–organic frameworks (MOFs), namely, [Pb7(TTPCA)4Cl2]·3H2O (1), [Pb7(TTPCA)4(DMA)2(HCOO)2]·H2O (2), and [Pb4(TTPCA)3]·3DMF·2H2O·H3O (3), were synthesized by the H3TTPCA ligand [H3TTPCA = 1,1′,1″-(1,3,5-triazine-2,4,6-triyl)-tripiperidine-4-carboxylic acid], with lead(II) nitrate under solvothermal conditions. They were characterized by CHN analysis, IR spectroscopy, UV–vis spectroscopy, and single-crystal and powder X-ray diffraction. In addition, their thermogravimetric analysis and fluorescence properties were studied. Compounds 1–3 were 3D MOF structures with different Pbx(COO)y clusters: ([Pb7(COO)12Cl2]), ([Pb7(COO)12]), and [Pb8(COO)18]. Fluorescence detection of compounds 1–3 shows that they can act as excellent sensors of nitrophenols with a low limit of detection and a high quenching constant.
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DOI
PubMed
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2020
·
IF 3.442
Hui Yong,Xin Wei,Yanhao Wang,Shihai Guo,Zeming Yuan,Yan Qi,Dongliang Zhao,Yanghuan Zhang
To improve hydrogen storage property of Mg-based alloy, the Mg–Ce–Y–Ni + 10 wt % M (M = Zr, Ti, V) composites were prepared by the combination of alloying and ball-milling, and their microstructure, phase evolution, as well as hydrogen storage thermodynamic and kinetic properties, were investigated by XRD , PCT, and DSC methods. The result shows that the hydrogenated samples are composed of MgH 2 , Mg 2 NiH 4 and corresponding ZrH 2 , TiH 2 and VH 1.9 phases. In comparison, the |Δ H| value of M = Ti sample is larger than that of M = Zr and M = V samples, and the M = Ti sample has the highest the peak temperatures and lowest plateau pressure, which indicates that Zr and V elements are more efficient to reduce the thermodynamic stability of RE-Mg-Ni hydrogen storage alloys. Besides, the DSC curve of the M = V sample has another endothermic peak which corresponds to the decomposition reaction between VH 1.9 and VH 0.8 , which has a contribution to desorption kinetic property for the M = V sample. The apparent activation energies ( E de ) show an increasing trend in the following order: M = Zr (87.7 kJ/mol) < M = V (89.1 kJ/mol) < M = Ti (99.3 kJ/mol).
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ChemistrySelect
·
2023
·Vol. 8
·期 39
·e202302583
·
IF 2.1
Chunyan Yang,Qin Yang,Lei Chen,Nan Xu,Fubin Chen,Ting Pu
Graphical N-doped yellow fluorescent carbon quantum dots (Y-CDs) and red fluorescent carbon quantum dots were prepared by reacting o-phenylenediamine and p-phenylenediamine with terephthalic acid using solvothermal method. The emission wavelengths of Y-CDs and R-CDs are located at 530 nm and 600 nm, respectively. These two types of carbon dots can quench water in organic solvents and determine the content of water in them. In this work, we reported two nitrogen doped carbon quantum dot fluorescence sensors (Y-CDs and R-CDs) with good stability and luminescence efficiency, which can be quickly, sensitively and low-cost for the determination of trace water content in organic solvents. Using o-phenylenediamine and p-phenylenediamine as nitrogen sources and terephthalic acid as carbon sources, the preparation was carried out through simple solvothermal synthesis and heteroatom doping. The luminescence characteristics and interaction mechanism with the target were discussed. The results indicate that the two carbon dots can effectively quench the water content in acetone, ethanol, and DMF, as well as physical interactions such as hydrogen bonding and dynamic quenching, which are the reasons for the observed quenching effect. Based on this, a new method for determining water content in organic solvents using carbon quantum dot fluorescence probes has been established. The linear relationship between the fluorescence quenching efficiency F 0 /F of two carbon quantum dots and the water content in different organic solvents was studied. The detection limits (LOD) of water in acetone, ethanol and N,N-dimethylformamide (DMF) were 0.17 %, 2.35 %, 0.26 %, respectively, determined by Y-CDs. The LOQ of acetone, ethanol, and DMF were 0.554 %, 7.83 %, 0.855 %, respectively. The LOD of water in acetone, ethanol and DMF determined by R-CDs were 0.056 %, 0.69 %, 0.27 % and the LOQ was 0.187 %, 2.290 %, 0.909 %, respectively. Good recovery rates and precision were achieved in practical applications.
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高影响因子
Food Bioscience
·
2023
·
IF 5.2
Shuai Zhao,Chengtuo Niu,Yiheng Wang,Feiyun Zheng,Chunfeng Liu,Jinjing Wang,Qi Li
Zygosaccharomyces rouxii ( Z. rouxii ) and Staphylococcus carnosus ( S. carnosus ) are fundamental taxa in spontaneous bean-based food fermentation , playing a vital role in flavor generation and macromolecule degradation. The present study aimed to investigate the biological mechanisms underlying the interaction between Z. rouxii Y-8 and S. carnosus M43 in BBP (broad bean paste) moromi by mono- and co-culture. It was found that the biomass of Z. rouxii and S. carnosus was higher in co-culture than that in mono-culture ( p < 0.05), indicating that a facilitation relationship among them. Moreover, the observed intensity of facilitation (OIF) peaked at 0.479 ± 0.002 under aerobic conditions, which was higher than that under anaerobic conditions (0.147 ± 0.014). Furthermore, the facilitative microbial interaction showed the stability and robustness during co-culture with different inoculum proportions (1:3, 1:5, 1:7, 1:10) and cell passage from 1 to 4 generations. Physical separation co-culture and acetic acid tolerance test revealed that acetic acid played a crucial role in regulating the interaction between Z. rouxii (R 2 = 0.6955) and S. carnosus (R 2 = 0.7097), with metabolic complementarity and inhibition alleviation as the underlying mechanisms. Additionally, Z. rouxii and S. carnosus as starter could enhance the accumulation of flavor compound, and accelerate the maturity of BBP fermentation. The dissection of interaction between Z. rouxii and S. carnosus provided valuable insights for revealing the complex web of relationships among microbiota and the development of microbial starter in BBP brewing ecosystem.
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高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2023
·
IF 2.8
Jiayu Feng,Kai Li,Ping Ning,Chi Wang,Xin Sun,Fei Wang,Peng Gao
In this study, a series of Mg-modified γ-Al2O3 sorbents have been introduced to simultaneously remove HCl and HF in a low-temperature environment. These sorbents were prepared by impregnation, and the effects of Mg loading amount and calcination temperature on the performance of the sorbent were investigated. The optimal sorbent (modified by 15 wt% Mg and calcined at 400℃, Mg15/Al2O3-400) exhibited the highest adsorption capacity of all the sorbents tested, 37.89 mg(HF)•gsorbent−1 and 34.54 mg(HCl)•gsorbent−1, respectively. Taking into account an excellent HF(HCl) capacity of the Mg15/Al2O3-400, these sorbents are very promising HF(HCl)sorbents usable in a low-temperature environment. The role of MgO loaded on γ-Al2O3 was investigated by Brunauer−Emmet−Teller (BET) method, X-ray diffractometer (XRD), scanning electron microscopy (SEM-EDS), X-ray photoelectron spectroscopy (XPS), temperature-programmed desorption of CO2 (CO2-TPD), and thermogravimetric analysis (TG-DTG). The results revealed that MgO acted as a ‘leading role’ to promote the adsorption activity of the sorbents. BET analysis demonstrated that the Mg modification process did not seriously change the pore type of the γ-Al2O3. CO2-TPD results revealed that the calcination temperature will significantly affect the number and strength of the basic sites on the surface of the sorbent. In addition, XRD and XPS analysis indicated that the consumption of MgO and the accumulation of reaction products on the surface and pores are the main reasons for the deactivation of the sorbent.
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DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR GRAPHICS & MODELLING
·
2023
·
IF 2.9
Bingyue Yan,Wei Yang,Yuyao Zhong,Qijun Duan,Jun Xie
With the development of alternate electrical power system and the improvement of voltage level, the operation conditions faced by epoxy resin (ER) insulation materials are becoming more and more complex. The traditional ER materials have been difficult to meet the increasingly stringent requirements. In this paper, the thermal and mechanical properties of DGEBA/TDE-85/MTHPA blend system were studied by molecular dynamics (MD) simulation and experiment. The results show that the addition of TDE-85 can significantly improve the thermal and mechanical properties, and the comprehensive improvement effect is the best when the molar ratio of DGEBA and TDE-85 is about 8:2. The experimental results are consistent with the simulation results. Further analysis of the micro-parameters of the monomer and the cross-linking network found that the torsional energy barrier of TDE-85 is higher than DGEBA. And the compatibility of the two ER is better when the ratio is 8:2. In addition, TDE-85 can introduce high-stability Y-nodes into the system, making the cross-linked network more stable, which has a significant effect on improving the thermal and mechanical properties. The research provide a reference for the blending modification of high-performance ER for high-voltage insulation.
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PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Yajing Cai,Guojie Zhang,Jun Liu,Yunfei Zhang,Tianshan Li,Xiaodi Zhang,Ying Wang,Yuqiong Zhao,Guoqiang Li
Dry reforming of methane (DRM) is an effective method for achieving carbon reduction and carbon neutrality by directly converting two greenhouse gases , CH 4 and CO 2 , into value-added products. However, catalysts used in this process are prone to metal sintering and carbon deposition , which are major obstacles. Thus, the design of high-performance catalysts is crucial for the success of dry reforming technology. In this paper, a series of Co-based catalysts modified with different rare earth metals (Y, Tb, Gd) and γ-Al 2 O 3 as the support were prepared using the conventional co-impregnation method. The effects of the introduction of rare earth metals additives on the activity and resistance to carbon build-up of the catalysts were investigated. The catalysts were analyzed using various characterization techniques. The results showed that Y and Tb as additives could effectively improve the activity and stability of the catalyst. However, the Gd modified Co-based catalyst had a large specific surface area but was less favorable for the DRM reaction. The best performance catalyst was achieved with the 10Co–5Y/γ-Al 2 O 3 under 750 °C with CH 4 and CO 2 conversions of 91.79% and 98.33%, respectively. This is mainly due to the fact that the introduction of Y enhances the electron transfer between Co and metal oxides , generating more oxygen vacancies and base vacancies on the surface, thus enhancing the adsorption and activation of CO 2 . The 10Co–5Y/γ-Al 2 O 3 catalyst demonstrated excellent DRM performance even after 20 h at 750 °C. Moreover, we proposed a hypothesis regarding the mechanism of resistance to carbon build-up. This study provides a reasonable idea to design Co-based catalysts with resistance to sintering and carbon accumulation to improve the performance of reforming catalysts.
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