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Towards a new avenue for rapid synthesis of electrocatalytic electrodes via laser-induced hydrothermal reaction for water splitting
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作者 Yang Sha Menghui Zhu +6 位作者 Kun Huang Yang Zhang Francis Moissinac Zhizhou Zhang Dongxu Cheng Paul Mativenga Zhu Liu 《International Journal of Extreme Manufacturing》 SCIE EI CAS CSCD 2024年第1期340-351,共12页
Electrochemical production of hydrogen from water requires the development ofelectrocatalysts that are active,stable,and low-cost for water splitting.To address these challenges,researchers are increasingly exploring ... Electrochemical production of hydrogen from water requires the development ofelectrocatalysts that are active,stable,and low-cost for water splitting.To address these challenges,researchers are increasingly exploring binder-free electrocatalytic integratedelectrodes (IEs) as an alternative to conventional powder-based electrode preparation methods,for the former is highly desirable to improve the catalytic activity and long-term stability for large-scale applications of electrocatalysts.Herein,we demonstrate a laser-inducedhydrothermal reaction (LIHR) technique to grow NiMoO4nanosheets on nickel foam,which is then calcined under H2/Ar mixed gases to prepare the IE IE-NiMo-LR.This electrode exhibits superior hydrogen evolution reaction performance,requiring overpotentials of 59,116 and143 mV to achieve current densities of 100,500 and 1000 mA·cm-2.During the 350 h chronopotentiometry test at current densities of 100 and 500 m A·cm-2,the overpotentialremains essentially unchanged.In addition,NiFe-layered double hydroxide grown on Ni foam is also fabricated with the same LIHR method and coupled with IE-NiMo-IR to achieve water splitting.This combination exhibits excellent durability under industrial current density.The energy consumption and production efficiency of the LIHR method are systematicallycompared with the conventional hydrothermal method.The LIHR method significantly improves the production rate by over 19 times,while consuming only 27.78%of the total energy required by conventional hydrothermal methods to achieve the same production. 展开更多
关键词 electrocatalytic electrode laser-induced hydrothermal reaction NiFe layered double hydroxides hydrogen evolution reaction water splitting energy consumption production rate
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Kinetics of Hydrothermal Reactions of Minerals in Near-critical and Supercritical Water 被引量:18
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作者 ZHANG Ronghua HU Shumin ZHANG Xuetong 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2000年第2期400-405,共6页
This work presents new experimental results on the kinetics of mineral dissolution in near-critical and supercritical water in a temperature range (T) from 25 to 400°C and a constant pressure of 23 MPa. Kinetic e... This work presents new experimental results on the kinetics of mineral dissolution in near-critical and supercritical water in a temperature range (T) from 25 to 400°C and a constant pressure of 23 MPa. Kinetic experiments were carried out by using a flow reactor (packed bed reactor) of an open system. The dissolution rates of albite and magnetite were measured under these experimental conditions. Na, Al and Si release rates for albite dissolution in water were measured as a function of the temperature and flow velocity in the reaction system. The maximum release rates of Na, Al and Si of albite dissolution in the hydrothermal flow systems under different flow velocities were always obtained at 300°C, that is to say, the maximum albite dissolution rates in the flow systems, regardless of different flow rates, were repeatedly measured at 300°C. Results indicate a wide fluctuation in albite dissolution rates occurring close to the critical point of water. The dissolution rates increased when the temperatures increased from 25 to 300°C and decreased when the temperatures increase from 300 to 400°C. At some flow velocities, the dissolution rates rose as the temperature surpassed 374°C. Albite dissolution was incongruent in water at most temperatures. It was only at 300°C that albite dissolution was congruent. The albite dissolution from 25 to 300°C (at 23 MPa) will change from incongruent to congruent, whereas from subcritical 300 to 400°C (at 23 MPa), the dissolution will change from congruent to incongruent. The release ratio of Al/Si (or Na/Si) is positive at T<300°C, and it is negative at T>300°C. The dissolution rates of magnetite in water increased with increasing T until T at the critical point of water or around it. The authors believe that this is caused by the wide fluctuations in water properties under the conditions from the near-critical to supercritical state. 展开更多
关键词 KINETICS hydrothermal reaction critical state
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LiFePO_4 doped with magnesium prepared by hydrothermal reaction in glucose solution 被引量:10
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作者 Xiu Qin Ou Guang Chuan Liang Jin Sheng Liang Sheng Zhao Xu Xia Zhao 《Chinese Chemical Letters》 SCIE CAS CSCD 2008年第3期345-349,共5页
Lithium iron phosphate (LiFePO4) doped with magnesium was hydrothermally synthesized from commercial LiOH, FeSO4, H3PO4 and MgSO4 with glucose as carbon precursor in aqueous solution. The samples were characterized ... Lithium iron phosphate (LiFePO4) doped with magnesium was hydrothermally synthesized from commercial LiOH, FeSO4, H3PO4 and MgSO4 with glucose as carbon precursor in aqueous solution. The samples were characterized by X-ray powder diffraction, scanning electron microscopy and constant charge-discharge cycling. The results show that the synthesized powders have been in situ coated with carbon precursor produced from caramel reaction of glucose. At ambient temperature (28±2℃), the electrochemical performances of LiFePO4 prepared exhibit the high discharge capacity of 135 mAh g^-1 at 5C and good capacity retention of 98% over 90 cycles. The excellent electrochemical performances should be correlated with the intimate contact between carbon and LiFePO4 primary and secondary particles, resulting from the in situ formation of carbon precursor/carbon, leading to the increase in conductivity of LiFePO4. 展开更多
关键词 Lithium iron phosphate Mg doping hydrothermal reaction GLUCOSE Carbon coated
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Carbon encapsulated magnetic nanoparticles produced by hydrothermal reaction
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作者 Nong Yue He Ya Fei Guo +3 位作者 Yan Deng Zhi Fei Wang Song Li Hong Na Liu 《Chinese Chemical Letters》 SCIE CAS CSCD 2007年第4期487-490,共4页
Carbon encapsulated magnetic nanoparticles (CEMNs) were synthesized by heating an aqueous glucose solution containing Fe-Au (Au coated Fe nanoparticles) nanoparticles at 160-180 ℃ for 2 h. This novel hydrothermal... Carbon encapsulated magnetic nanoparticles (CEMNs) were synthesized by heating an aqueous glucose solution containing Fe-Au (Au coated Fe nanoparticles) nanoparticles at 160-180 ℃ for 2 h. This novel hydrothermal approach is not only simple but also provides the surface of CEMNs with functional groups like--OH. The formation of carbon encapsulated magnetic nanoparticles was not favored when using pure Fe nanoparticles as cores because of the oxidation of Fe nanoparticles by 1-120 during the reaction and, therefore, the surfaces of the naked Fe nanoparticles had to be coated by Au shell in advance. TEM, XRD, XPS and VSM measurments characterized that they were uniform carbon spheres containing some embedded Fe-Au nanoparticles, with a saturation of 14.6 emu/g and the size of the typical product is -350 nm. 展开更多
关键词 Carbon encapsulated magnetic nanoparticles hydrothermal reaction Gold shell
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STRUCTURE CONTROL IN HYDROXYAPATITE SYNTHESIS BY HYDROTHERMAL REACTION AND ORGANIC MODULATORS 被引量:1
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作者 Huigang Zhang Qingshan Zhu 《China Particuology》 SCIE EI CAS CSCD 2005年第6期317-320,共4页
Properties of materials are determined not only by their composition, but also by their structure. It is, therefore, of great significance to develop the ability of tailoring the structure of materials according to th... Properties of materials are determined not only by their composition, but also by their structure. It is, therefore, of great significance to develop the ability of tailoring the structure of materials according to the requirements of intended applications. In this work a novel glutamic acid-assisted hydrothermal process was developed to synthesize apatite crystals with controllable morphologies. Varied morphologies from whisk broom, fibers, mushroom, prickly spheres, to dandelion were produced through modulating both the formation of a transitory phase and its transformation into the final phase. 展开更多
关键词 structure control hydrothermal reaction APATITE
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Excess capacity on compound phases of Li_(2)FeTiO_(4) composite cathode materials synthesized by hydrothermal reaction using optional titanium sources to boost battery performance
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作者 Liu Yang Shaohua Luo +6 位作者 Yafeng Wang Yang Zhan Qing Wang Yahui Zhang Xin Liu Wenning Mu Fei Teng 《Chinese Chemical Letters》 SCIE CAS CSCD 2020年第12期3200-3204,共5页
Li_(2)FeTiO_(4) composites have been produced using commercial LiAC,FeCl_(2) and different titanium sources by hydrothermal synthesis(HS)at 175℃and subsequent annealing at 700℃.Impure phase TiO_(2),Fe_(2)O_(3) and F... Li_(2)FeTiO_(4) composites have been produced using commercial LiAC,FeCl_(2) and different titanium sources by hydrothermal synthesis(HS)at 175℃and subsequent annealing at 700℃.Impure phase TiO_(2),Fe_(2)O_(3) and FeTi0_(4) were detected out among the Li_(2)FeTiO_(4) composites with different titanium sources.Micron and nano-sized particles of Li2FeTiO4 were prepared from various titanium raw materials,with nano-sized particles predominating when titanium raw materials were layered hydrogen titanate nanowire(H2Ti3O7 NW,HTO-NW)and titanium oxide nanotubes(TiO_(2) NB).The Li_(2)FeTiO_(4) composites synthesized by HTO-NW shows a primary particle size of 50-200 nm of high crystallinity staggered with undissolved nanowire with a diameter size of about 100 nm.The samples using one-dimensio nal nanometer titanium oxide(TiO2 NB)as the raw material can get a super high initial discharge capacity of 367.8 mAh/g at the rate of C/10 and excellent cycling stability.The selection of raw materials and adopting multi-phase modification can be considered as an effective strategy to improve the electro-chemical properties of Li_(2)FeTiO_(4) composite cathode materials for the lithium secondary battery. 展开更多
关键词 Li_(2)FeTiO_(4)nanocomposites Cathode materials hydrothermal reaction Lithium ion battery Post-heat-treatment
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Synthesis of Low-cost LiFePO_4 from Li_2CO_3 by a Novel Hydrothermal Method and Investigation on the Reaction Mechanism 被引量:2
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作者 李向锋 HU Yunlong +1 位作者 LIU Fang 张昭 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2015年第2期223-230,共8页
Phspho-olivine Li Fe PO4 was synthesized from the relatively insoluble lithium source Li2CO3, proper iron and phosphorus sources(n(Li):n(Fe):n(P)=1:1:1) by a novel hydrothermal method. Afterwards, the opti... Phspho-olivine Li Fe PO4 was synthesized from the relatively insoluble lithium source Li2CO3, proper iron and phosphorus sources(n(Li):n(Fe):n(P)=1:1:1) by a novel hydrothermal method. Afterwards, the optimal sample was mixed with glucose and two-step calcinated(500 ℃ and 750 ℃) under high-purity N2 to obtain the Li Fe PO4/C composite. The resultant samples were characterized by X-ray diffraction(XRD), atomic absorption spectrometry(AAS), scanning electron microscops(SEM), transmission electron microscopy(TEM), energy dispersive spectrometry(EDS), elementary analysis(EA) and electrochemical tests. The results show that the optimal reaction condition is to set the reactant concentration at 0.5 mol·L^-1, the reaction temperature at 180 ℃ for 16 h duration. During the reaction course, an intermediate product NH4 Fe PO4·H2O was first synthesized, and then it reacted with Li+ to form Li Fe PO4. The optimized Li Fe PO4 sample with an average particle size(300 to 500 nm) and regular morphology exhibits a relatively high discharge capacity of 84.95 m Ah· g^-1 at the first charge-discharge cycle(0.1C, 1C=170 m A·g^-1). Moreover, the prepared Li Fe PO4/C composite shows a high discharge capacity of 154.3 m Ah·g^-1 at 0.1C and 128.2 m Ah·g^-1 even at 5C. Besides it has good reversibility and stability in CV test. 展开更多
关键词 Li-ion battery LiFePO4 hydrothermal method Li2CO3 reaction mechanism
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Effective Activation of Melamine for Synchronous Synthesis of Catalytically Active Nanosheets and Fluorescence-Responsive Quantum Dots
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作者 Jie Xuan Guijian Guan Ming-Yong Han 《Transactions of Tianjin University》 EI CAS 2024年第3期284-296,共13页
Because of the low reactivity of cyclic nitrides,liquid-phase synthesis of carbon nitride introduces challenges despite its favorable potential for energy-efficient preparation and superior applications.In this study,... Because of the low reactivity of cyclic nitrides,liquid-phase synthesis of carbon nitride introduces challenges despite its favorable potential for energy-efficient preparation and superior applications.In this study,we demonstrate a strong interaction between citric acid and melamine through experimental observation and theoretical simulation,which eff ectively activates melamine-condensation activity and produces carbon-rich carbon nitride nanosheets(CCN NSs)during hydrothermal reaction.Under a large specific surface area and increased light absorption,these CCN NSs demonstrate significantly enhanced photocatalytic activity in CO_(2) reduction,increasing the CO production rate by approximately tenfold compared with hexagonal melamine(h-Me).Moreover,the product selectivity of CCN NSs reaches up to 93.5%to generate CO from CO_(2).Furthermore,the annealed CCN NSs exhibit a CO conversion rate of up to 95.30μmol/(g h),which indicates an 18-fold increase compared with traditional carbon nitride.During the CCN NS synthesis,nitrogen-doped carbon quantum dots(NDC QDs)are simultaneously produced and remain suspended in the supernatant after centrifugation.These QDs disperse well in water and exhibit excellent luminescent properties(QY=67.2%),allowing their application in the design of selective and sensitive sensors to detect pollutants such as pesticide 2,4-dichlorophenol with a detection limit of as low as 0.04μmol/L.Notably,the simultaneous synthesis of CCN NSs and NDC QDs provides a cost-eff ective and highly efficient process,yielding products with superior capabilities for catalytic conversion of CO_(2) and pollutant detection,respectively. 展开更多
关键词 Carbon nitride hydrothermal reaction PHOTOCATALYSIS Carbon dioxide Quantum dots
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Hydrothermal Synthesis and Thermal Decomposition Mechanism of Alkaline Earth Benzoates 被引量:9
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作者 Zhang, Keli Yuan, Jibing +1 位作者 Yuan, Liangjie Sun, Jutang 《Wuhan University Journal of Natural Sciences》 EI CAS 1999年第1期91-96,共6页
Alkaline earth benzoates were synthesized using hydrothermal reaction. The complexes were characterized by elemental analysis, IR, X ray powder diffraction. All of them are monoclinic and have layered structure. The ... Alkaline earth benzoates were synthesized using hydrothermal reaction. The complexes were characterized by elemental analysis, IR, X ray powder diffraction. All of them are monoclinic and have layered structure. The mechanism of thermal decomposition of alkaline earth benzoates was studied by using TG, DTA, IR and gas chromatography mass spectrometry. The thermal decomposition of alkaline earth benzoates in nitrogen proceeded in one or two stages: they decomposed to form MCO 3 (M=Ca,Sr,Ba) or MgO and organic compounds, respectively. The organic compounds obtained from decomposition reaction are mainly benzophenone, triphenylmethane and so on. 展开更多
关键词 alkaline earth BENZOATE hydrothermal reaction thermal decomposition
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A New Cadmium(Ш) Polymer Based on 3,5-Pyrazoledicarboxylic Acid:Hydrothermal Synthesis and Crystal Structure 被引量:2
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作者 周秋香 王猛 白晓杰 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2012年第1期7-10,共4页
The reaction of CdCl3.2.5H2O with 3,5-pyrazoledicaiboxylic acid under hydrother-mal conditions produce a novel three-dimensional(3-D) coordination polymer [Cd2(C5H2O4N2)2.2H2O]n.The title compound crystallizes in ... The reaction of CdCl3.2.5H2O with 3,5-pyrazoledicaiboxylic acid under hydrother-mal conditions produce a novel three-dimensional(3-D) coordination polymer [Cd2(C5H2O4N2)2.2H2O]n.The title compound crystallizes in the monoclinic system,space group P21/c with a = 6.422(4),b = 12.334(7),c = 8.936(6) ,β = 104.793(7)°,V = 684.4(7) 3,Z = 4,Dc = 2.761 g/cm3,μ = 3.181 mm-1,F(000) = 544,R = 0.0248 and wR = 0.0624.In the crystal structure of the title compround,molecules are linked through N-H...O hydrogen bonds,forming chains running along the a axis.Every Cd(Ш) coordinates with four molecules of ligand and one water molecule,forming a pentagomal-bipyramidal geometry. 展开更多
关键词 hydrothermal reaction 3-D coordination polymer crystal structure
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Improved two-step hydrothermal process for acetic acid production from carbohydrate biomass 被引量:1
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作者 Zhibao Huo Yan Fang +3 位作者 Guodong Yao Xu Zeng Dezhang Ren Fangming Jin 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2015年第2期207-212,共6页
An improved two-step process for converting carbohydrate biomass to acetic acid under hydrothermal conditions is proposed. The first step consists of the production of lactic acid from carbohydrate biomass, and the se... An improved two-step process for converting carbohydrate biomass to acetic acid under hydrothermal conditions is proposed. The first step consists of the production of lactic acid from carbohydrate biomass, and the second step consists of conversion of the lactic acid obtained in the first step to acetic acid using CuO as an oxidant. The results indicated that CuO as an oxidant in the second step can significantly improve the production of high-purity acetic acid from lactic acid, and the maximum yield of acetic acid was 61%, with a purity of 90%. The yield of acetic acid obtained using the improved two-step hydrothermal process from carbohydrate biomass, such as glucose, cellulose and starch, was greater than that obtained using traditional two-step process with H_2O_2 or O_2. In addition, a proposed pathway for the production of acetic acid from lactic acid in the second step with CuO was also discussed. The present study provides a useful two-step process for the production of acetic acid from carbohydrate biomass. 展开更多
关键词 carbohydrate biomass lactic acid CUO acetic acid hydrothermal reactions
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Hydrothermal Synthesis, Crystal Structure and Photoluminescence of [Sm(PCA)_3(H_2O)_2]_n·6nH_2O 被引量:1
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作者 陈文通 魏坤宇 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2011年第5期672-677,共6页
A new one-dimensional (1-D) compound [Sm(PCA)3(H2O)2]n·6nH2O (1, HPCA=pyrazinecarboxylic acid) has been synthesized via hydrothermal reaction and structurally characterized by single-crystal X-ray diffrac... A new one-dimensional (1-D) compound [Sm(PCA)3(H2O)2]n·6nH2O (1, HPCA=pyrazinecarboxylic acid) has been synthesized via hydrothermal reaction and structurally characterized by single-crystal X-ray diffraction. Compound 1 crystallizes in the Pbca space group of orthorhombic system with a=19.465(3), b=12.034(4), c=19.842(4) , V=4648(2)3, C15H25N6O14Sm, Mr=663.76, Dc=1.897 g/cm3, S=1.023, μ(MoKα)=2.610 mm-1, F(000)=2648, R=0.0239 and wR=0.0616. Compound 1 is characteristic of an infinite 1-D chain-like structure with the samarium atoms locating at an environment of a monocapped square antiprism. The [Sm(PCA)3(H2O)2]n chains and the lattice water molecules interconnect together through π-π interactions and hydrogen bonding interactions to yield a 3-D supramolecular framework. Photoluminescent investigation reveals that the title compound displays an emission in the greenish blue region. 展开更多
关键词 crystal structure hydrothermal reaction LANTHANIDE PHOTOLUMINESCENCE pyrazinecarboxylic acid
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Temperature-dependent Hydrothermal Synthesis of Two Distinct Three-dimensional Copper Complexes 被引量:2
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作者 杨玉亭 屠长征 +2 位作者 缪娇娇 李俊莉 陈广 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2016年第4期597-604,共8页
Two distinct copper coordination polymers, namely [Cu^Ⅱ2(2,5-pydc)2(bpp)2]·H2O(1) and Cu2^ⅠCu^Ⅱ(2,5-pydc)2(bpp)2(2)(2,5-pydc = pyridine-2,5-dicarboxylic acid, bpp = 1,3-bi(4-pyridyl)propane), h... Two distinct copper coordination polymers, namely [Cu^Ⅱ2(2,5-pydc)2(bpp)2]·H2O(1) and Cu2^ⅠCu^Ⅱ(2,5-pydc)2(bpp)2(2)(2,5-pydc = pyridine-2,5-dicarboxylic acid, bpp = 1,3-bi(4-pyridyl)propane), have been successfully synthesized through hydrothermal conditions under different temperatures. Single-crystal X-ray structural analysis revealed that both complexes 1 and 2 are 3D frameworks. Complex 1 is an 8-connected 2-fold interpenetrating network based on [Cu(2,5-pydc)]4 molecular building block(MBB), and also can be simplified as a 4-connected net if the Cu(Ⅱ) ion is regarded as an independent node, whereas 2 shows a(4,4)-connected non-interpenetrated framework which contains mixed valence Cu(Ⅰ/Ⅱ) centers. The results demonstrate that temperature plays a significant role in the final structures of the complexes. 展开更多
关键词 copper coordination polymer temperature hydrothermal reactions mixed valence
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Hydrothermal Synthesis, Crystal Structure and Luminescent Property of a Cd(Ⅱ) Compound with(4,6)-Connected Topology 被引量:2
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作者 张鑫 孙明玲 +1 位作者 覃业燕 姚元根 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2016年第6期914-920,共7页
A new Cd(Ⅱ) coordination polymer, namely {Cd_2(L)(biimpy)(H_2O)}_n(1, H4 L = 3-(3?,5?-dicarboxylphenoxy)phthalic acid, biimpy = 2,6-bis(1-imdazoly)pyridine), has been successfully synthesized via the ... A new Cd(Ⅱ) coordination polymer, namely {Cd_2(L)(biimpy)(H_2O)}_n(1, H4 L = 3-(3?,5?-dicarboxylphenoxy)phthalic acid, biimpy = 2,6-bis(1-imdazoly)pyridine), has been successfully synthesized via the hydrothermal reactions of Cd(Ⅱ) ions, H_4L and biimpy. The crystal structure is of triclinic, space group P1 with a = 7.7874(5), b = 9.9716(5), c = 18.5278(6) ?, α = 91.327(4), β = 96.689(4), γ = 111.896(5)o, V = 1322.39(12) ?~3, C_(27)H_(17)Cd_2N_5O_(10), M_r = 796.26, Z = 2,D_c = 2.000 g/cm^3, F(000) = 780, μ = 1.679 mm^(-1), R = 0.0345 and wR = 0.0767 for 3890 observed reflections(I 〉 2s(I)). Single-crystal X-ray structural analysis reveals that compound 1 features a three-dimensional(3D) framework based on two different dinuclear [Cd_2(COO)_2] building subunits, and topological analysis shows that it can be simplified into a binodal(4,6)-connected topological network with the point symbol of {3.4~2.5~2.6}{3~2.4~2.5~2.6~4.7~4.8}. Moreover, the thermal stability and luminescent property of compound 1 were also studied. 展开更多
关键词 Cd(Ⅱ) compound hydrothermal reaction 3D framework luminescence
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Synthesis of Coordination Polymers Using Different Maleic Acid Ligands under Hydrothermal Conditions
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作者 WANG Xiao-lan WANG En-bo XU Xin-xin 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2007年第3期245-249,共5页
A novel coordination polymer, [ Ni (mal) (1,10'-phen) ( H2O) ] n ( 1 ) ( mal = malate, 1,10'-phen = 1,10- phenanthroline) was synthesized using malic acid which was generated from maleic acid via hydrother... A novel coordination polymer, [ Ni (mal) (1,10'-phen) ( H2O) ] n ( 1 ) ( mal = malate, 1,10'-phen = 1,10- phenanthroline) was synthesized using malic acid which was generated from maleic acid via hydrothermal reaction. Complex 1, which displays a two-dimensional supramolecular network, was formed by the addition reaction of Ni and maleic acid with water molecules. To our knowledge, several coordination polymers have been directly synthesized from malic acid, but these types of complexes have seldom been synthesized from maleic acid via hydrothermal reactions. When Ni( Ⅱ ) ion was changed to Zn( Ⅱ) ion under the same condition, two-dimensional covalent complex 2 [ Zn2 (fma) 2 (1,10'-phen) 2 ] n (fma = fumatic acid) was formed. Furthermore, complex 2 exhibits intense photolumi- nescent property at room temperature. 展开更多
关键词 Maleic acid hydrothermal reaction Mixed ligands Photoluminescent property
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Hydrothermal Assembly and Structural Characterization of a Novel 3D Coordination Polymer: [Cd_2Zn(BTC)_2(H_2O)_4]_n·2nH_2O
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作者 陈建新 刘世雄 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 北大核心 2005年第1期3-3,共1页
A hydrothermal reaction of 1,3,5-benzene-tricarboxylic acid (H3BTC) with cad- mium acetate, zinc acetate and pyridine led to the formation of pink crystals of [Cd2Zn(BTC)2- (H2O)4]n?2nH2O 1. Single-crystal X-ray dif... A hydrothermal reaction of 1,3,5-benzene-tricarboxylic acid (H3BTC) with cad- mium acetate, zinc acetate and pyridine led to the formation of pink crystals of [Cd2Zn(BTC)2- (H2O)4]n?2nH2O 1. Single-crystal X-ray diffraction analysis has revealed that 1 (Cd2ZnC18H18O18) crystallizes in the monoclinic system, space group C2/c with a = 19.4328(7), b = 7.1420(3), c = 18.0426(5) ?, β = 118.035(1)o, V = 2210.3(1) ?3, Mr = 812.49, Dc = 2.442 g/cm3, Z = 4, μ(MoKα) = 3.081 mm-1 and F(000) =1584. A total of 10735 reflections were collected, of which 2544 were unique. The structure was refined to R = 0.0200 and wR = 0.0603 for 2388 observed reflections with I>2σ(I). The crystal structure consists of cadmium(II)/zinc(II) carboxylates of BTC as well as coordination and discrete water molecules. Extension of the coordination geometry around three metal centers (Cd(1), Cd(2) and Zn(1)), two BTC3- ligands and four coordinated water molecules generates a three-dimensional coordination polymer. 展开更多
关键词 hydrothermal reaction coordination polymer 1 3 5-benzene-tricarboxylic acid cadmium complex ZINC
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Hydrothermal Synthesis, Crystal Structure and Fluorescence Property of a Novel Coordination Polymer [Eu_2(C_6H_8O_4)_3(H_2O)_2]_n·n(4,4′-bpy)
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作者 董国义 窦军红 +3 位作者 葛世艳 林琳 郑一博 韦志仁 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 北大核心 2005年第1期69-73,共5页
A novel coordination polymer [Eu2(C6H8O4)3(H2O)2]n?n(4,4?-bpy) (Mr = 928.51) was synthesized by the hydrothermal reaction of EuCl3?6H2O, adipic acid and 4,4?-bpy, and determined by elemental analysis, IR spectroscop... A novel coordination polymer [Eu2(C6H8O4)3(H2O)2]n?n(4,4?-bpy) (Mr = 928.51) was synthesized by the hydrothermal reaction of EuCl3?6H2O, adipic acid and 4,4?-bpy, and determined by elemental analysis, IR spectroscopy, thermal gravimetric analysis, single-crystal diffraction and fluorescence property. X-ray analysis reveals that a three-dimensional network has been formed between Eu3+ by carboxyl of adipic acid. The crystal is of orthorhombic, space group Pbcn with a = 21.870(7), b = 7.652(2), c = 19.624(6) ?, V = 3284.1(17) ?3, Z = 4, Dc = 1.878 g/cm3, μ = 3.854 mm-1, F(000) = 1824, R = 0.0345 and wR = 0.0565. The coordination polymer exhibits intensive red light under UV excitation at room temperature, which is attributed to the 5D0→7F2 transition of Eu(Ⅲ) ions. 展开更多
关键词 hydrothermal reaction three-dimensional coordination polymer crystal structure fluorescence property
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Photo-degradation of Acid-red 3B dye catalyzed by TiO_2 nanotubes 被引量:6
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作者 JIANG Fang ZHENG Shou-rong ZHENG Zheng XU Zhao-yi WANG Yan-jin 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2006年第4期783-787,共5页
TiO2 nanotube precursor was synthesized by the hydrothermal reaction of TiO2 powders with NaOH solution and the properties of the nanotube materials were tuned using different post-treatments. Transmission electron mi... TiO2 nanotube precursor was synthesized by the hydrothermal reaction of TiO2 powders with NaOH solution and the properties of the nanotube materials were tuned using different post-treatments. Transmission electron microscopic (TEM) observation revealed that the nanotube could be obtained by either a direct rinse with acid solution or rinse with distilled water followed by acid solution. The results of X-ray diffraction (XRD) and inductively coupled plasma (ICP) analysis indicated that the nanotube material was composed of H2Ti2O5·H2O. In addition, the photocatalytic activities of the resulting catalysts were found to be strongly dependent on the post-treatment. The results of the photocatalytic reaction showed that the degradation of Acid-red 3B dye fitted pseudo-zero-order kinetics and TiO2 nanotube prepared under direct rinse with acid solution exhibited a higher catalytic efficiency compared to other catalysts. 展开更多
关键词 TiO2 nanotube Acid-red 3B photocatalysis hydrothermal reaction
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Synthesis and Crystal Structure of [La(BTC)(H_2O)_6]_n 被引量:4
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作者 WEN Yi-Hang CHENG Jian-Kai +3 位作者 FENG Vun-Long ZHANG Jian LI Zhao-Ji YAO Yuan-Gen 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 北大核心 2005年第12期1440-1444,共5页
The title compound, [La(BTC)(H2O)6]n1 (H3BTC = benzene-1,3,5-tricarboxylic acid), has been synthesized by the hydrothermal reaction of La(NO3)3·3H2O with H3BTC and Na2CO3, and its structure was determined... The title compound, [La(BTC)(H2O)6]n1 (H3BTC = benzene-1,3,5-tricarboxylic acid), has been synthesized by the hydrothermal reaction of La(NO3)3·3H2O with H3BTC and Na2CO3, and its structure was determined by single-crystal X-ray diffraction. The crystal structure is of monoclinic, space group Cc with a = 11.5289(3), b = 18.0383(7), c = 7.3507(3) A, β= 119.5680(10)°, V = 1329.59(8)A^3, C9H15LaO12, Mr = 454.12, Z = 4, Dc = 2.269 g/cm^3,μ = 3.280 mm^-1, Flack parameter = 0.07(4), F(000) = 888, R = 0.0316 and wR = 0.0774 for 1312 observed reflections(I〉 2σ(I)). Complex 1 features a one-dimensional (l-D) parallel ribbon-like structure. There are extensive hydrogen-bonding interactions involving coordinated water molecules and free carboxylate oxygen atoms. In addition, π-π interactions via benzoic multicarboxylate ligands are discussed. These non-covalent interactions lead to the formation of a 3-D framework. 展开更多
关键词 hydrothermal reaction ribbon-like non-covalent interactions
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Design of best performing hexagonal shaped Ag@CoS/rGO nanocomposite electrode material for electrochemical supercapacitor application 被引量:3
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作者 Alagu Segar DEEPI Arputharaj Samson NESARAJ 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2020年第10期2764-2774,共11页
The mixed metal/metal sulphide(Ag@CoS)with reduced graphene oxide(rGO)nanocomposite(Ag@CoS/rGO)was synthesized for the possible electrode in supercapacitors.Ag@CoS was successfully deposited on the rGO nanosheets by h... The mixed metal/metal sulphide(Ag@CoS)with reduced graphene oxide(rGO)nanocomposite(Ag@CoS/rGO)was synthesized for the possible electrode in supercapacitors.Ag@CoS was successfully deposited on the rGO nanosheets by hydrothermal method,implying the growth of 2D Ag and CoS-based hexagonal-like structure on the rGO framework.The synthesized nanocomposite was subjected to structural,morphological and electrochemical studies.The XRD results show that the prepared nanocomposite material exhibits a combination of hexagonal and cubic phase due to the presence of CoS and Ag phases together.The band appearing at nearly 470.33 cm^−1 in FTIR spectra can be ascribed to the absorption of S—S bond in the Ag@CoS/rGO nanocomposite.The clear hexagonal structure was analysed by SEM and TEM with the grain sizes ranging from nanometer to micrometer.The electrode material exhibits excellent cyclic stability with a specific capacitance of 1580 F/g at a current density of 0.5 A/g without any loss of capacitive retention even after 1000 cycles.Based on the electrochemical performance,it can be inferred that the prepared novel nanocomposite material is very suitable for using as an electrode for electrochemical supercapacitor applications. 展开更多
关键词 Ag@CoS/rGO electrode hydrothermal reaction physicochemical characteristics electrochemical performance electrochemical supercapacitor
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