ACS Catalysis
·
2025
·
IF 13.1
Rui Zhai,Zhenyu Wang,Chang Huang,Chao Zeng,Mengyue Gu,Tianqi Wang,Fanqi Bu,Shaobin Wang,Jinying Zhang
Phosphorus has various crystallographic structures and variable phosphorus-derived structures, which have attracted much attention due to its unique properties. One-dimensional phosphorus structures with atomic substitution in the phosphorus lattice are extremely favored due to their high specific surface area and stable single-atom dispersion. The precise crystal structures and single atomic substitution positions are crucial factors to understand the mechanism of single-atom effects but remain a big challenge. Herein, single crystals composed of 1D zigzag linear phosphorus selenium chains (ZLP-Se) have been produced and characterized by SC-XRD to be P18.56Se1.44 with a space group of Pnma (CSD-2348033). The exact Se substitution positions were further ascertained by calculations of the whole thermodynamic stability phase diagram to have three types of substitution patterns (Se1/P1 mixed occupied positions with intervals of 3Se+2P, 1Se+4P, and 1Se+1P+1Se+2P). The selenium-rich crystal plane (-10-1) has been demonstrated to significantly enhance CO2 adsorption and C−C coupling to obtain ethylene (C2H4). A high photocatalytic CO2 reduction performance (18.0 μmol g−1 h−1, 97.0% electron selectivity for C2H4) has been achieved by the ZLP-Se with the Ag cocatalyst. The adsorption of CO2* and CO* was found to be much stronger on the Se-rich surface of ZLP-Se. The CO* intermediates were found to be energetically favored for protonation and subsequent asymmetrical C−C coupling to produce C2H4, with COCHO* intermediates detected by in situ DRIFTS. The electron was also demonstrated by in situ XPS to transfer from Se and Ag to P under Xe lamp irradiation, confirming the electronic localization effect of ZLP-Se to yield C2H4.
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ORGANIC ELECTRONICS
·
2019
·
IF 3.495
Tongchao Chu,Xiuping Ju,Xiao Han,Hongmei Du,Yan Zhang,Jinsheng Zhao,Junhong Zhang
Three novel electrochromic copolymers PTPE-1, PTPE-2, and PTPE-3 were synthesized by changing the ratio of donor to acceptor using the Stille coupling polymerization . 5,8,14,17-tetrabromoquinoxaline[2′,3':9,10]phenanthro[4,5-abc] phenazine (monomer b) was first introduced and employed as multi-functionalized unit with bisquinoxaline structure and high planarity, which was used as the acceptor unit. Two electron-rich monomers ProDOT-decyl 2 (monomer a) and thiophene (monomer c) are selected as the co-monomers and donor units. The three polymers were tested by X-ray photoelectron spectroscopy (XPS), cyclic voltammetry (CV), spectro-electrochemistry, kinetics, thermogravimetric analysis (TG), etc. All three polymers have narrow band gaps of lower than 1.85 eV and satisfactory thermal stability. As to electrochromic switching properties, the polymers showed high optical contrast and fast response time both in the visible and near-infrared regions. The optical contrasts are 53.35% at 540 nm and 66.49% at 1325 nm for PTPE-3, and its coloration efficiencies are 163 cm 2 C −1 at 540 nm, 205 cm 2 C −1 at 1325 nm, with fast switch time of less than 1 s. The color changes of three polymers were diversified and distinct, PTPE-1 changes from chestnut color to blue-gray color, PTPE-2 changes from dull red color to wathet color and PTPE-3 changes from deep red color to light blue-gray color. The excellent properties of the polymers might result from their cross-linked structure and consequent formation of the compatible ion transport channel.
研究领域:
材料科学
·
电化学
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ACS Omega
·
2019
·
IF 2.584
Fanfan Gao,Xinyu Li,Yue Zhang,Chengde Huang,Wen Zhang
Redox flow batteries have received wide attention because of their unique advantages such as high efficiency, long cycle life, low operating cost, and independent adjustment of energy power. In this study, five types of anthraquinone derivative organic redox couple were selected, and the surfaces of graphite felt were modified. When the number of functional groups is increased or the substitution position is closer to the carbonyl (C═O) groups, a more pronounced hindrance for the C═O reaction on the benzene ring is observed; thus, the electrochemical performance and reversibility decreases. Sodium 9,10-anthraquinone-2-sulfonate solution is the best organic redox couple in terms of both reversibility and electrochemical performance. It was also found that all the surface treatment methods of graphite felt are beneficial for improving their electrochemical performances. All these superior results demonstrate that the graphite felt treated under air exposure at 550 °C for 3 h exhibited the best electrochemical performance, which might be attributed to the increase in the content of C–OH functional groups.
研究领域:
储能技术
·
电化学
·
材料科学
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RSC Advances
·
2018
·Vol. 8
·期 18
·9611-9617
·
IF 2.936
Ji-Wei Shen,Zhiqing Wang,Xiaoxuan Wei,Jiawei Liu,Yinmao Wei
Herein, user-friendly control of the synthesis of sub-10 nm hexagonal (β-) NaYbF4:Er nanocrystals (NCs) with extremely low-level Gd3+ doping (0%, 10 mol%) was achieved. We reveal for the first time that the effective sodium/fluoride levels during the formation of cubic (α-) nuclei are not only controlled by the sodium/fluoride to rare-earth precursor ratios used, but also sensitively restricted by the in situ NaF generation reaction in a sodium oleate-based solvothermal system. Excessive in situ NaF generation will lead to a respective sodium- and fluoride-deficient environment, delayed α-to-β transition and larger β-NCs. Based on these effects, sub-10 nm monodisperse low-level Gd3+-doped β-NaYbF4:Er was obtained with a user-friendly low fluoride dosage by finely balancing this NaF generation reaction and achieving an intrinsic optimized sodium-fluoride level for NC nucleation. Notably, our work represents the first example where the focus is on the competing in situ NaF generation reaction and its use for nucleation regulation, as well as for the user-friendly control of the solvothermal synthesis of sub-10 nm β-NaYbF4:Er.
研究领域:
材料科学
·
纳米技术
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PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Guoqiang Cui,Xuebing Yang,Tingting Liu,Zaizhi Liu,Lei Yang
An efficient approach for enzyme-enhanced extraction using an ionic liquid solution (ILEEE) of the major alkaloidal components camptothecin (CPT) and 10-hydroxycamptothecin (HCPT) from the samara of Camptotheca acuminata is presented. The enzyme pretreatment in an aqueous ionic liquid (IL) media was used for the enhancement of extraction yield. The activity of hemicellulase was investigated in various ILs with imidazolium-based cations ([C 2 MIM] + , [C 4 MIM] + , [C 6 MIM] + , [C 8 MIM] + , [C 10 MIM] + ) and anions (Br − , Cl − , Ac − , HSO 4 − , NO 3 − ). The optimal ionic liquid for the hemicellulase extraction process was found to be a 0.75 M [C 8 MIM]Br aqueous solution. Single factor experiments and Box–Behnken design found the optimal operational parameters for ILEEE to be an incubation temperature of 40 °C, incubation time of 12 h, extraction phase of pH 4, liquid-solid ratio of 30 mL/g, 0.75 M [C 8 MIM]Br and a hemicellulase concentration of 0.441 mg/mL. Under these optimized extraction conditions, the total yield of CPT and HCPT was 1043 ± 51.2 μg/g. SEM images of the samples revealed that hemicellulases hydrolyze the cell wall, leading to structure breakdown, which enabled [C 8 MIM]Br to have a high dissolving power for the targeted components. These factors are the main causes for the increasing in the total yield of the CPT and HCPT when using the ILEEE extraction method.
研究领域:
药学
·
化学工程
·
生物技术
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2026
·
IF 2.4
Yuhang Chen,Long Cheng,Zhao Lei,Yuqi Su,Maogang He,Ying Zhang
Transport properties, including thermal diffusivity and the Fick diffusion coefficient, are key parameters for optimizing chemical processes and ensuring production safety. In this work, the thermal diffusivity and Fick diffusion coefficient of the n–heptane + n–decane binary mixture were measured by dynamic light scattering at n–heptane amount fractions from 0.25 to 0.75. Measurements were performed along five isobars at 0.1, 2.5, 5.0, 7.5, and 10 MPa. Thermal diffusivity was determined over 298.15–523.15 K, except at 0.1 MPa, where the temperature range was limited to 298.15–373.15 K, while Fick diffusion coefficients were obtained from 298.15 to 373.15 K. The relative expanded uncertainties in thermal diffusivity and Fick diffusion coefficient were estimated to be 0.094 and 0.146, respectively, at a confidence level of 0.95 (k = 2). The effects of temperature, pressure, and composition on thermal diffusivity and Fick diffusion coefficient were analyzed, aiming to offer guidance for optimizing the design of industrial processes and ensuring operational safety and reliability.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2014
·
IF 5.03
Chun-Feng Gao,Li-Ping Wang,Qi-Feng Li,Chao Wang,Zhao-Dong Nan,Xiao-Zheng Lan
In practical use, latent heat storage system always faces a lack of phase change materials (PCMs) that have ideal performance at desirable temperature and high efficiency to treat thermal effects from various outer heat sources. To solve this problem, some new latent heat storage composites were prepared by incorporating those well-performed PCMs in porous materials. In doing this, the layered perovskite-type compounds, (1-C 10 H 21 NH 3 ) 2 ZnCl 4 (C 10 Zn) and (1-C 12 H 25 NH 3 ) 2 ZnCl 4 (C 12 Zn), were embedded in controlled porous glass (CPG), which can acquire size-dependent thermal properties. Heat storage nature, morphology and crystalline structures of the materials were characterized using differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and powder X-ray diffractions (XRD). Under confinement of the porous glass with nominal pore sizes of d =12–300 nm, the porous C n Zn compound gains a regulation window of around 10 °C in relation to the bulk by its solid–solid phase transition. The transition temperature ( T d ), depression of the transition temperature (∆ T trs ), and enthalpy change of the transition (∆ trs H d ) of the confined compound show a linear relation to the reverse pore size. A same stable thermal cycling property is observed in the pore compound as the bulk, which is consistent with similar diffraction patterns among them. The supercooling of the pore form becomes larger than the bulk. The retention of the layered structure and complete crystallization in the pore C n Zn is responsible for its reversible heat storage property.
研究领域:
材料科学
·
热能工程
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EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2021
·Vol. 2021
·期 12
·1152-1159
·
IF 2.524
Quansen Wu,Gongguo Zhang,Yanyun Ma,Mengfan Li,Feng Liu,Hongwen Huang,Maochang Liu,Yiqun Zheng
Graphical Wavy gold-silver alloy nanowires with tunable diameters in the range of 2–10 nm are prepared via an ultrafast seed-mediated co-reduction. Their UV-vis extinction spectra show a broad absorbance band in the range of 450–550 nm. We report an ultrafast synthesis of wavy gold-silver (AuAg) nanowires with tunable diameters via a seed-mediated co-reduction. The success of current strategy relies on the use of an elevated reaction temperature to accelerate the synthesis to be completed within several minutes and the use of Au seeds with controlled sizes to enable the manipulation over their diameters in the range of 2–10 nm. The presence of chloride-contained quaternary ammonium surfactant and excessive reductant have been demonstrated to be critical for the high-yield formation of AuAg products with the unique morphology of wavy nanowire. Due to the advantage in size control, the size effect on the plasmonic behavior of AuAg alloy wavy nanowires is investigated, where the products with sub-5 nm diameter exhibit a broad shoulder absorbance peak in their spectrum.
研究领域:
材料科学
·
纳米技术
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Journal of Cleaner Production
·
2023
·
IF 11.1
Shen Xu,Jianying Huang,Zengxing Li,Yonggang Lei,Yingzhen Zhang,Kim Hoong Ng,Yuekun Lai
It is very attractive to find a cheap and efficient cocatalyst for enhancing the H 2 generation of graphitic carbon nitride (CN) under visible light. To achieve that, we proposed a novel two-step method to deposit sub-10 nm metallic Ni 2 P particles on the surface of CN sheets for a maximized interfacial contact. Characteristic results confirmed the establishment of ohmic heterojunction upon Ni 2 P-modification of CN, which deemed to be an effective measure to alleviate photo-charges recombination. In addition to facilitating spatial separation of charges, Ni 2 P could also enhance the optical properties of CN while reducing its impedance for interfacial electron shuttling. Better still, the P-end of Ni 2 P is highly electronegative, offering desirable H + -capturing capability for enhanced H 2 generation. These give rise to an improved H 2 production of Ni 2 P/CN composite, optimally at 645.3 μmol g −1 ·h −1 as compared to immeasurable H 2 yielded by the pristine CN. Such photocatalytic performance is even comparable to the Pt-modified CN photocatalyst (640.6 μmol g −1 ·h −1 ). In recyclability test, a notable activity suppression of 33.17% was recorded after four reaction cycles. This can be ascribed to the pronounced photo-corrosion of the Ni 2 P cocatalyst during photoreaction. Nonetheless, a remarkably high H 2 generation (1328.6 μmol g −1 in 3 h) was still attained at 4 th cycle. This justifies the effectiveness of our synthesized Ni 2 P cocatalyst in enhancing H 2 generation of CN under visible light irradiation.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Yuanming Fu,Xianyang Meng,Ximei Liang,Jiangtao Wu
The density and viscosity of liquid 1-dodecanol and 1,12-dodecanediol were reported, which were obtained simultaneously by using a vibrating-wire viscometer. The measurements were determined at temperatures from 298.15 to 573.15 K for 1-dodecanol and 373.15 to 573.15 K for 1,12-dodecanediol and at pressures from 0.1 to 10 MPa. The combined expanded uncertainties (k = 2) of the reported data for density and viscosity were estimated to be 0.26% and 2.1%, respectively. The density and viscosity data obtained in this work were correlated with the Tait-type equation and Andrade–Tait equation, respectively. The average absolute percentage deviation of the density data from the correlations were 0.08% for 1-dodecanol and 0.06% for 1,12-dodecanediol, and the average absolute percentage deviation of the viscosity data from the correlations were 0.64% for 1-dodecanol and 0.67% for 1,12-dodecanediol. The correlations were also used to compare the present results with the available literature data. An acceptable agreement between the present results and the literature data was observed. Finally, the derived properties of isobaric expansibility and isothermal compressibility were derived based on the Tait-type equation of this work.
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DYES AND PIGMENTS
·
2020
·
IF 4.613
Wei Zhang,Yang Luo,Yang Zhou,Ming Liu,Weitao Xu,Bing Bian,Zhu Tao,Xin Xiao
A new fluorescent probe composed of cucurbit[10]uril (Q[10]) and a water-soluble derivative of pyrene, aminopropyl-1-pyrenebutanamide (PBA), is designated. 1 H NMR spectroscopy reveals that PBA is encapsulated into Q[10] in an aqueous solution to form a stable 1:1 host-guest inclusion complex of PBA@Q[10]. This complex behaves as a highly selective fluorescence quenching probe for Fe 3+ in aqueous solutions that may be attributed to the efficient absorption of Fe 3+ , which hindering absorption of PBA@Q[10] probe at the excitation wavelength of 332 nm, and competitive experiments for the coexistence of Fe 3+ with one or all of the other metal ions (37 metal ions) reveals that the selectivity of PBA@Q[10] to Fe 3+ is not disturbed by the addition of 50.0 equiv. of the other metal ions. The limits of detection of Fe 3+ was determined to be 0.55 mM. Furthermore, the fluorescence enhancing effect of PBA@Q[10] for Ag + is detected at the above wavelength. According to the mechanistic studies, the fluorescence enhancing route involves interaction of Ag + ions with the probe, mainly under an internal charge transfer between Ag + and the probe. Outcomes of this study suggest that PBA@Q[10] probably functions as a potential and promising fluorescence sensor for monitoring of different polluting metal ions in waste waters.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2013
·Vol. 299
·期 3
·1509-1515
·
IF 1.467
Liu Zhen-feng,Wang Guo-lin,Dong Meng-jie,Jin Jian-wen,Li Jia-jun,Zhang Qian,Zhao Kui,Yang Shu-ye,Lin Xiang-tong
The preparation of 10-(2-[ 18 F]fluoroethoxy)-20( S )-camptothecin, a potential positron emission tomography tracer for the imaging of topoisomerase I in cancers, is described. 10-(2-[ 18 F]Fluoroethoxy)-20( S )-camptothecin was synthesized by the [ 18 F]fluoroalkylation of the corresponding hydroxy precursor molecule with 2-[ 18 F]fluoroethyl bromide ([ 18 F]FEtBr) in dimethylsulfoxide (DMSO) at 55 °C for 20 min; this was followed by purification using high performance liquid chromatography (HPLC) with a total preparation time of 60 min. The overall radiochemical yield was approximately 5.4–12 % (uncorrected), and the radiochemical purity was above 96 %.
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危险品化学品经营许可证（带存储）