RESEARCH ON CHEMICAL INTERMEDIATES
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2022
·Vol. 48
·期 10
·4105-4118
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IF 3.134
Tang Wanjun,Liu Yunyi,Ding Shuang,Zhao Dongmei,Li Tingcheng,Xie Guangyong
MoV 2 O 8 micro-cuboids were environment-friendly prepared via a facile one-step solvothermal route followed by thermal treatment with vanadium pentoxide and ammonium molybdate as raw materials without using harmful solvents or surfactants. Characterization by XRD, FTIR, XPS, SEM and TEM showed that MoV 2 O 8 formed a layered structure by the stacking of nanosheets and assumed a micro-cuboid shape with a thickness of 150∓30 nm, a width of 350∓110 nm and a length of 680∓18 nm. For the first time, the catalytic properties of MoV 2 O 8 micro-cuboids were investigated for the gas-phase ammoxidation of p -chlorotoluene (PCT) to p -chlorobenzonitrile (PCBN). The as-prepared catalyst exhibited high activity and selectivity in the ammoxidation of PCT to PCBN, with a near 100% conversion and 83.6% yield.
Graphical abstract
研究领域:
材料化学
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催化化学
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纳米材料
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绿色合成
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有机反应工程
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DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 4
·2252-2257
·
IF 3.049
Zichen Wei,Yang Yang,Chenyang Wang,Zhili Li,Lixian Zheng,Jun Luo
Improving room-temperature thermoelectric performance of p-type (Bi,Sb)2Te3 is essential for its practical application. However, the usual doping or alloying methods increase the carrier concentration and result in enhanced thermoelectric properties at high temperatures but not room temperature. In this work, we find that Ti is a promising dopant to shift the optimum thermoelectric properties of p-type (Bi,Sb)2Te3 to room temperature by reducing its carrier concentration. p-type Bi0.5Sb1.5−xTixTe3 samples with various Ti contents have been prepared using a simple melting method. The carrier concentration of Bi0.5Sb1.5−xTixTe3 is reduced by partially replacing Sb with Ti, leading to not only a significantly increased Seebeck coefficient but also an improved power factor near room temperature. Moreover, the total thermal conductivity near room temperature also decreases owing to the combined effect of decreased electrical conductivity and an anisotropic microstructure. An optimal zT value of ∼1.2 is achieved near room temperature for the sample containing 6 at% Ti, and its average zT value below 150 °C increases to ∼1.1, demonstrating the great potential of this material for room-temperature thermoelectric devices.
研究领域:
材料科学
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热电学
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能量转换
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Zhen Tian,Mingxing Zhao,Xiongxiong Xue,Wei Xia,Chenglei Guo,Yanfeng Guo,Yexin Feng,Jiamin Xue
Different two-dimensional (2D) materials, when combined together to form heterostructures, can exhibit exciting properties that do not exist in individual components. Therefore, intensive research efforts have been devoted to their fabrication and characterization. Previously, vertical and in-plane 2D heterostructures have been formed by mechanical stacking and chemical vapor deposition. Here, we report a new material system that can form in-plane p–n junctions by thermal conversion of n-type SnSe2 to p-type SnSe. Through scanning tunneling microscopy and density functional theory studies, we find that these two distinctively different lattices can form atomically sharp interfaces and have a type II to nearly type III band alignment. We also demonstrate that this method can be used to create micron-sized in-plane p–n junctions at predefined locations. These findings pave the way for further exploration of the intriguing properties of the SnSe2–SnSe heterostructure.
研究领域:
材料科学
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纳米技术
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凝聚态物理
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半导体器件
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DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 20
·15469-15478
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IF 3.84
Tingting Wang,Hui Meng,Xiang Yu,Yizhu Liu,Hongbin Chen,Yi Zhu,Jinpeng Tang,Yexiang Tong,Yuanming Zhang
A BiOI/SnS2 p–n junction is prepared by depositing BiOI particles on flowerlike SnS2 flakes. The heterojunction formed between p-type BiOI and n-type SnS2 brings greatly improved photocatalytic activity compared with pure SnS2 or BiOI in the degradation of Rhodamine B dye under visible light and sunlight irradiation. The improved photocatalytic performance is explained by the synergetic effects of the formation of a p–n junction between BiOI and SnS2. The migration of photogenerated carriers can be promoted by the electric field established at the heterojunction interfaces, leading to effective separation of the photogenerated electron–hole pairs and reduced electron–hole recombination. The BiOI/SnS2 heterojunction will find promising applications in photocatalysis and solar energy conversion.
研究领域:
材料科学
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光催化
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纳米材料
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能量转换
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DOI
高影响因子
ORGANIC & BIOMOLECULAR CHEMISTRY
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2011
·Vol. 10
·期 8
·1527-1536
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IF 3.451
Dong-Sheng Guo,Hong-Qing Zhang,Fei Ding,Yu Liu
The binding geometries, abilities and thermodynamic parameters for the intermolecular complexation of two water-soluble calixarenes, p-sulfonatocalix[4]arene (SC4A) and p-sulfonatocalix[5]arene (SC5A), with biguanidinium guests, metformin (MFM) and phenformin (PFM), were investigated by 1H and 2D NMR spectroscopy, X-ray crystallography, and isothermal titration calorimetry (ITC). The obtained results show that biguanidinium guests are captured by calixarenes with the alkyl or aromatic portion immersed into the cavities and the guanidinium portion fixed at the upper-rims. At both acidic and neutral conditions, SC4A always presents stronger binding affinities to biguanidinium guests than SC5A. Moreover, SC4A prefers to include MFM rather than PFM. As a result, the binding selectivity of MFM is up to 44.7 times for the SC4A/SC5A hosts. The intrinsic relationship between binding structures and selectivities were comprehensively analyzed and discussed from the viewpoint of thermodynamics. Finally, the ITC measurements were further performed in phosphate buffer instead of aqueous solution, to examine the buffer effects, counterion effect, and the differences between thermodynamic and apparent association constants.
研究领域:
超分子化学
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热力学
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物理有机化学
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分子识别
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药物化学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Zichen Wei,Zhili Li,Pengfei Luo,Jiye Zhang,Jun Luo
To improve the thermoelectric properties of a material, the carrier concentration needs to be optimized first. But the increase of carrier concentration usually results in degraded carrier mobility , which restricts the enhancement in thermoelectric performance. Herein, we report the Cd doped Bi 0.5 Sb 1.5 Te 3 which overcomes such a trade-off between carrier concentration and mobility. The doping of Cd results in significantly increased hole concentration, which successfully suppresses the bipolar diffusion. Meanwhile, magnetic measurements indicate that the Hall mobility increases with the doping of Cd owing to the decrease of anti-site defects. Thus, simultaneous increase of carrier concentration and mobility is realized in p-type Bi 0.5 Sb 1.5 Te 3 through Cd doping, resulting in significantly enhanced power factor. In addition, the lattice disorder induced by the substitution of Cd for Sb/Bi leads to an obvious reduction in lattice thermal conductivity . As a result, a zT value of 1.2 at 120 °C is achieved for the 2 at% Cd doped sample. The peak zT of the 4 at% Cd doped sample is shifted to 185 °C due to the effectively suppressed bipolar effect and an average zT value of ∼1.0 is obtained in the temperature range of 50–300 °C. Our achievement demonstrates that there is still a significant room to improve the thermoelectric properties of the intensively investigated BiSbTe system by simply doping a properly selected element.
研究领域:
热电材料
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材料科学
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固体物理
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DOI
高影响因子
Journal of Macromolecular Science Part A-Pure and Applied Chemistry
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2024
·
IF 2.1
Yong Tian,Yubin Zhang,Hong Wang,Zhong Lin,Liqi Wu,Zhihua Zhou,Rongjin Zeng,Jian Chen
P-xylene (PX), as one of xylenes, is a kind of very important chemical raw material. It is generally fabricated using methanol (MeOH) and toluene (TOL), and serves as a useful intermediary. However, it is difficult to use a simple and convenient tool to distinguish it from TOL and MeOH. Herein, we reported a simple naphthalene diimide-based polycaprolactone polymer (NDI-PCL) as a high-sensitive fluorescent sensor for xylene detection from MeOH and TOL. NDI-PCL was synthesized via ring-opening polymerization (ROP) of ε-caprolactone. NDI-PCL showed a remarkable fluorescence change from blue to green and yellow because of the formation of charge transfer (CT) interaction between naphthalene diimide (NDI) and aromatic solvents. NDI-PCL was successfully applied as the high-sensitive sensor for discriminating binary solvent mixtures such as PX in TOL, MeOH in PX, and MeOH in TOL, and their limit of detection (LOD) were as low as 19 ppm, 16 ppm and 9 ppm. These excellent fluorescence properties ensured that NDI-PCL indicated great potential application in detecting aromatic solvents.
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DOI
高影响因子
RUSSIAN JOURNAL OF GENERAL CHEMISTRY
·
2025
·Vol. 95
·期 3
·644-653
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IF 0.8
Wang J.,Zhou Y.,Wu X.,Zhou X.,Sun Y.,Wu W.,Wang X.
Discovering super-efficient herbicides with novel structures is one of the effective ways to solve the increasingly severe weed resistance problem and meet ecological requirements. In this work, a series of novel bromo- p -hydroxybenzamides were designed based on the molecular hybridization strategy, and rapidly synthesized by one-step amidation reaction, and then characterized by 1 H NMR, 13 C NMR and HRMS. The herbicidal activity assay indicated that most of the target compounds exhibited good-to-excellent inhibition effects on seed germination of two model plants. At a concentration of 100 mg/L, the inhibition rate of 3,5-dibromo- N -(4-bromo-3-chlorophenyl)- p -hydroxybenzamide reached up to 98 and 96% on the roots and stalks of the monocotyledonous barnyard grass ( E. crus-galli ), respectively. 3,5-Dibromo- N -(2-bromophenyl)- p -hydroxybenzamide showed excellent inhibitory activity on the roots and stalks of dicotyledonous rape ( B. napus ) at 100 mg/L, with an inhibitory rate of more than 90%. Furthermore, the concentration was reduced to 1 mg/L, the inhibitory rate of 3,5-dibromo- N -(2-bromophenyl)- p -hydroxybenzamide on the roots of B. napus was still as high as 90%. This work provides a novel molecular scaffold for the development and research of new super-efficient herbicides.
研究领域:
农药化学
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植物生理学
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DOI
高影响因子
MACROMOLECULAR MATERIALS AND ENGINEERING
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2022
·Vol. 307
·期 9
·2200180
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IF 4.402
Xuemei Zhang,Chen Gao,Yulin Zhang,Xiangdong Wang,Yuhan Duan,Jun Peng,Ping Luo,Yinjie Peng,Xiaoyu Wang,Shisen Wang,Rong Ran
A novel double-crosslinked 3D network hydrogel, poly(aniline-co- p -phenylenediamine-co-melamine) (PD 2 M 4 ) is synthesized through the chemical oxidative copolymerization of aniline, melamine, and p -phenylenediamine, and its properties are compared with those of polyaniline (PANI), poly(aniline-co- p -phenylenediamine) (PPDA 2 ), and poly(aniline-co-melamine) (PMA 4 ) hydrogels. The morphologies, mechanical properties, and chemical compositions of the hydrogels are investigated by nitrogen physisorption, rheological test, microscopic measurements, and spectroscopic techniques, while electrochemical techniques are used to evaluate their electrochemical performances. In accordance with PANI, PPDA 2 , and PMA 4 hydrogels, the PD 2 M 4 hydrogel exhibited an interconnected long nanofiber structure that encouraged the diffusion of electrolyte ions. Its double-crosslinked 3D network and high nitrogen-doping content (6.3 at. %) offered synergistic effects that generated an impressive pseudocapacitance of 657 F g −1 at 0.2 A g −1 , a superior rate capability of 72% retention at a high current density of 30 A g −1 , and good cyclic stability of 62% after 2000 charge/discharge cycles. The present work, therefore, provides a novel copolymerization strategy for N-doping and hierarchical network structure to enhance the electrochemical performances of PANI hydrogel electrodes in supercapacitor applications.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Caichi Liu,Dongbo Jia,Qiuyan Hao,Xuerong Zheng,Ying Li,Chengchun Tang,Hui Liu,Jun Zhang,Xueli Zheng
Iron–nickel sulfide ((Ni,Fe)3S2) is one of the most promising bifunctional electrocatalysts for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline media because of their metallic conductivity and low cost. However, the reported HER activity of (Ni,Fe)3S2 is still unsatisfactory. Herein, three-dimensional self-supported phosphorus-doped (Ni,Fe)3S2 nanosheet arrays on Ni foam (P-(Ni,Fe)3S2/NF) are synthesized by a simple one-step simultaneous phosphorization and sulfuration route, which exhibits dramatically enhanced HER activity as well as drives remarkable OER activity. The incorporation of P significantly optimized the hydrogen/water absorption free energy (ΔGH*/ΔGH2O*), enhanced electrical conductivity, and increased electrochemical surface area. Accordingly, the optimal P-(Ni,Fe)3S2/NF exhibits relatively low overpotentials of 98 and 196 mV at 10 mA cm–2 for HER and OER in 1 M KOH, respectively. Furthermore, an alkaline electrolyzer comprising the P-(Ni,Fe)3S2/NF electrodes needs a very low cell voltage of 1.54 V at 10 mA cm–2 and exhibits long-term stability and outperforms most other state-of-the-art electrocatalysts. The reported electrocatalyst activation approach by anion doping can be adapted for other transition-metal chalcogenides for water electrolysis, offering great promise for future applications.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Ning Zhang,Xiaojing Chen,Jiaojiao Zhao,Pengfei He,Xuli Ding
Despite the great potential of nano-alloying anodes to prominently increase the electrochemical performance in sodium ions batteries , the low-cost and mass-produced methods, as well as the optimization design of alloy-based composites are still needed. Herein, a simple but effective electrospinning method is used to fabricate Sb/P@C composite nanospheres with adjustable P, Sb ratio and uniform morphology. It is found that the amount of Sb inside the Sb/P@C composite and the porous structure can be readily modulated. It is worth noting that the improved electrochemical performance of the Sb/P@C anodes can be attributed to the synergistic effect of Na + ions storage and superior charge transfer in the fabricated composite with reciprocally inlaid Sb/P and C that inhibiting the aggregation of nanospheres . Particularly, the mosaic distribution of Sb/P nanospheres in the carbon matrix not only accelerate the ions and electrons transfer but also serve as the buffer for alleviating the volumetric variation. Importantly, a high capacity of 350 mAh g −1 can be achieved even rising current density to 500 mA g −1 , indicating great potential for high rate sodium ions anodes. The tactics of this work should be general to other alloy-type systems, such as Sn, Bi et al., which also suffer from severe volume expansion causing electrode performance degradation.
研究领域:
材料科学
·
能源存储
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DOI
高影响因子
Surfaces and Interfaces
·
2026
·
IF 6
Qingpo Yang,Shangkang Xie,Zixiang Xing,Jie Liu,Yufeng Shen,Ling Huang,Rubo Fang,Feng Feng,Chunshan Lu,Qingtao Wang,Chong Yao,Qunfeng Zhang,Xiaonian Li
The shielding effect effectively suppresses the chemical adsorption between platinum and sulfur species and hinders the formation of Pt-S bonds. • Electrons transfer from Pt to the carbon encapsulation layer to construct metal-carbon interfacial structures, which endows the catalyst with superior hydrogenation activity in sulfur-containing environments. • Carbon-encapsulated structure enhances the structural stability and sulfur resistance of the catalyst. • Experimental characterizations combined with DFT calculations elucidate the underlying reaction mechanism. The presence of sulfur-containing impurities in industrial feedstocks leads to the rapid deactivation of metal-based catalysts, which originates from the specific recognition between the d orbitals of metallic active sites and the p orbitals of sulfur. In this work, a carbon-encapsulation catalyst strategy was employed to shield this specific d–p orbital recognition effect. The Pt-base catalyst showed a sharp 92.28% loss in activity after sulfur poisoning, whereas the carbon-encapsulated catalyst maintained high efficiency and stability, sustaining a reaction rate of 83.41 min –1 even at high mercaptan concentrations (7945 ppm). Moreover, it exhibited excellent reusability with negligible deactivation after five cycles. Characterization and density functional theory (DFT) calculations revealed that the carbon shell serves as “armor” for Pt active sites, physically isolating them from sulfur impurities and suppressing the hybridization between Pt nanoparticles (Pt NPs) and the S 2p orbitals. Meanwhile, Pt nanoparticles induce electron transfer to the carbon layer, converting it into a conductive “metallic carbon” that enhances hydrogenation activity. This work provides new insights into the anti-sulfur poisoning mechanism of catalytic hydrogenation. Download: Download high-res image (255KB) Download: Download full-size image
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