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t-BuOK/DMF-Promoted C-3 sulfuration of Oxindoles via a Radical Process

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有机化学 2024年第9期44卷 2898-2905页

作者： Wang Lili Zhang Zhou Wang Tingliang Wang Xinglan Mao Yuanhu Zhang Jiquan Guizhou Provincial Engineering Technology Research Center for Chemical Drug R&D College of PharmacyGuizhou Medical UniversityGuiyang 561113

An efficient C-3 sulfuration of oxindoles has been *** disulfide as the sulfurating agent,a wide range of sulfurated oxindoles have been synthesized under t-BuOK/N,N-dimethylformamide(DMF)promoted *** present method i... 详细信息

关键词： oxindole disulfide sulfuration radical

Solvent-free nanocasting toward universal synthesis of ordered mesoporous transition metal sulfide@N-doped carbon composites for electrochemical applications

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Nano Research 2019年第9期12卷 2250-2258页

作者： Jiahui Zhu Zhi Chen Lin Jia Yuqi Lu Xiangru Wei Xiaoning Wang Winston Duo Wu Na Han Yanguang Li Zhangxiong Wu Suzhou Key Laboratory of Green Chemical Engineering School of Chemical and Environmental EngineeringCollege of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China Institute of Functional Nano and Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials and DevicesSoochow UniversitySuzhou 215123China

Transition metal sulfides (TMSs) have a wide range of applications owing to their intriguing *** efforts have been devoted to nanostructuring TMSs to enhance their properties and performance,still there is a high need in general synthesis of TMS ***,for the first time,a simple solvent free reactive nanocasting approach that integrates solid precursor loading,in-situ sulfuration and carbonization into a single heating step is developed for the universal synthesis of ordered mesoporous TMS@N-doped carbon composites (denoted as OM-TMS@NCs) with methionine (Met) and metal chlorides as the precursors and the mesoporous silica (SBA-15) as the hard template.A series of OM-TMS@NCs with a hexagonal mesostructure,ultra-high surface areas (430-754 m2·g-1),large pore volumes (0.85-1.32 cm3·g-1),and unique TMS stoichiometries,including MoS2,Fe7S8,Co9S8,NiS,Cu7S4 and ZnS,are *** distinct structure configurations,namely,highly dispersed ultrathin TMS nanosheets within NCs and TMS@NC co-nanowire arrays,can be obtained depending on different *** structure evolution of the OM-TMS@NCs over the solvent-free nanocasting process is studied in detail for a deep understanding of the *** demonstrations,these materials are promising for electrocatalytic hydrogen evolution reaction and lithium ion storage with high performances.

关键词： transition metal sulfides mesoporous materials solvent-free nanocasting in-situ sulfuration carbon-based composites electrochemical applicati ons

Preparation of Cu(In,Al)(Se,S)2 Thin Films by Low-Cost Non-vacuum Hybrid Process

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Chinese Journal of Chemical Physics 2015年第6期28卷 -页

作者： Zhao-fan Liu Wei Xia Chen-chen Yuan Pai-feng Luo Department of Materials Science and Engineering Hefei University of Technology Hefei 230009China CAS Key Laboratory of Materials for Energy Conversion University of Science and Technology of China Hefei 230026 China

Cu(In,Al)(Se,S)2 thin films were successfully obtained through a simple low-cost non-vacuum process. The Cu(In,Al)Se2 raw material powder was firstly synthesized by a traditional solvothermal route. Then, the precursor coatings were prepared by drop-coating Cu(In, Al)Se2 slurry. Finally, the Cu(In,Al)Se2 and Cu(In,Al)(Se,S)2 films were achieved by the selenization and/or sulfuration process. Through X-ray diffraction (XRD), scanning electron microscope, X-ray fluorescence, and absorption spectroscopy measurement, it was found that all the films show the single chalcopyrite phase structure and have the preferred (112) orientation. Meanwhile, after substituting selenium by sulfur, the main XRD peaks shift to higher 2θ degrees and the porous films become more compact. The energy band gap also increases to a suitable range for light absorption from 1.21 eV to 1.33 eV, which indicates that the additional sulfuration process is much more favorable for improving the quality of Cu(In,Al)(Se,S)2 films.

关键词： Non-vacuum Solvothermal X-ray diffraction sulfuration

Amorphous FeCoNi-S as efficient bifunctional electrocatalysts for overall water splitting reaction

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Chinese Chemical Letters 2023年第2期34卷 576-581页

作者： Runze He Chunyan Wang Ligang Feng School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002China

Developing bifunctional electrocatalysts for overall water splitting reaction is still highly desired but with large challenges. Herein, an amorphous Fe Co Ni-S electrocatalyst was developed using thioacetamide for the sulfuration of Fe Co Ni hydroxide during the hydrothermal process. The obtained catalyst exhibited an amorphous structure with hybrid bonds of metal-S bond and metal-O bonds in the catalyst system. The optimized catalyst showed a largely improved bifunctional catalytic ability to drive water splitting reaction in the alkaline electrolyte compared to the Fe Co Ni hydroxide. It required an overpotential of 280 m V and 80 m V(No-IR correction) to offer 10 m A/cm^(2)for water oxidation and reduction respectively;a low cell voltage of 1.55 V was required to reach 10 m A/cm^(2)for the water electrolysis with good stability for12 h. Moreover, this catalyst system showed high catalytic stability, catalytic kinetics, and Faraday efficiency for water splitting reactions. Considering the very low intrinsic activity of Fe Co Ni hydroxide, the efficient bifunctional catalytic ability should result from the newly formed hybrid active sites of metallic metal-S species and the high valence state of metal oxide species. This work is effective in the bifunctional catalytic ability boosting for the transition metal materials by facile sulfuration in the hydrothermal approach.

关键词： Bifunctional electrocatalyst Amorphous Overall water splitting FeCoNi hydroxide sulfuration

Surface Modification of NiW Alloy Substrates

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稀有金属材料与工程 2011年第S3期40卷 380-382页

作者： Wang Xue1, 2, Li Chengshan2, Yu Zeming2, Zheng Huiling2, Ji Yongbin2, Chen Zewen 1, 2, Fan Zhanguo 1 1Northeastern University, Shenyang 110004, China 2Northwest Institute for Non-ferrous Metal Research, Xi’an 710016, China NW Inst Nonferrous Met Res Superconducting Mat Res Ctr Xian 710016 Peoples R China Northeastern Univ Shenyang 110004 Peoples R China

We have studied the adsorption of elemental S on the surfaces of NiW alloy substrates where elementary sulfur was used as sulfur source. Compared with those previous investigations which used H2S as the sulfur source and operated in an ultra-high vacuum chamber, we used elemental sulfur as the sulfur source which does not need an ultra-high vacuum chamber but Ar-H protection atmosphere in the process of sulfuration. After sulfuration, epitaxial LZO buffer layers were deposited on these substrates directly. The samples were investigated by means of AFM, XPS, SEM and XRD in this study. The results show that after sulfuration, S forms a c (2×2) structure at a coverage of 0.5 ML, in agreement with previous results, representing the effectiveness of elemental sulfur during the sulfuration process. The c (2×2)-S superstructure on the surface of the NiW substrates has optimized the La2Zr2O7(LZO) buffer layer texture.

关键词： NiW substrates sulfuration c (2×2) structure buffer layer

Selective flotation of smithsonite from dolomite by using novel mixed collector system

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Transactions of Nonferrous Metals Society of China 2019年第5期29卷 1082-1089页

作者： Li WANG Guang-yan HU Wei SUN SultanAhmed KHOSO Run-qing LIU Xiang-feng ZHANG School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083China Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-containing Mineral Resources Central South UniversityChangsha 410083China

A novel mixed collector (BHOA) was prepared by mixing benzohydroxamic acid (BHA) and sodium oleate (NaOL) and applied to the flotation separation of smithsonite from dolomite. Flotation results showed that NaOL alone had good collecting performance on smithsonite and common gangue mineral dolomite but had poor selectivity. By using a BHA/NaOL mixed system with a molar ratio of 2:1, the recoveries of smithsonite and dolomite reached approximately 90% and 5%, respectively. Surface tension analysis showed that the surface activity of BHOA was a little higher than that of a single NaOL because of synergistic effects. Zeta potential and X-ray photoelectron spectroscopy measurements indicated that surfactants BHA and NaOL co-absorbed on the smithsonite surface and only NaOL was present on the dolomite surface in the presence of BHOA.

关键词： flotation smithsonite dolomite sodium oleate benzohydroxamic acid sulfuration