检索结果-南通市图书馆

Single-atom Co alloyed Ru for electrocatalytic nitrite reduction to ammonia

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第5期17卷 3660-3666页

作者： fuzhou Wang Jiaqi Xiang Guike Zhang Kai Chen Ke Chu School of Materials Science and engineering Lanzhou Jiaotong UniversityLanzhou 730070China

Electrochemical converting NO_(2)^(-)into NH_(3)(NO_(2)RR)holds an enormous prospect to attain efficient NH_(3) electrosynthesis and polluted NO_(2)^(-)***,we report single-atom Co alloyed Ru(Co_(1)Ru)as an efficient and durable NO_(2)RR *** experimental and theoretical investigations reveal that single-atom Co alloying of Ru enables the construction of Co_(1)-Ru heteronuclear active sites to synergistically promote NO_(2)^(-)activation/hydrogenation while suppressing the competitive H_(2) evolution,rendering the greatly enhanced activity and selectivity of Co_(1)Ru towards the NO_(2)***,Co_(1)Ru assembled within a flow cell exhibits an impressive NH_(3) yield rate of 2379.2μmol·h^(-1)·cm^(-2) with an NH_(3)-Faradaic efficiency of 92%at a high current density of 415.9 mA·cm^(-2),which is among the highest NO_(2)RR performances reported to date.

关键词： electrochemical converting NO_(2)-into NH3 single-atom alloys theoretical computations industrial-level current density

ADF Studies of Neutral Small C_n(n=3～6)High-symmetry Clusters

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Structural chemistry 2000年第3期19卷 168-173页

作者： HUANG Xin\ LI Jun Qian ② (Department of chemistry, fuzhou university, fuzhou, 350002, china) (State Key Laboratory of Structural chemistry, fuzhou, 350002, china) 福州大学福建福州 350 0 0 2 中科院福建物质结构所结构化学国家重点实验室福建福州 350 0 0 2

The geometries, electronic structures of pure carbon clusters were investigated in the range of C 3 to C 6 size. To obtain accurate results, the STO double zeta basis sets with a polarization function are selected. The main focuses are on the new geometry, electronic structures of carbon clusters, such as the three dimensional structure for C 4, C 5 and so on. The clusters are found to have more isomers corresponding to different geometries and spin multiplicities close to their ground states. We find that the spin multiplicity of the ground state or close to ground state of odd numbered linear chain is 1. But in even numbered linear chains, the spin multiplicity is 3. In odd numbered cyclic structure without branch chain, the spin multiplicity of the ground state or close ground state is 3, and that of even numbered is 1. But the three dimensional structure disagree those principles.

关键词： small carbon clusters density function geometry eletronic structure spin multiplicity

Hydrothermal Synthesis and Structure of a New Molybdenum Phosphate: (NH_3CH_2CH_2NH_3)_(2.5)[Mo_5O_(15)(PO_4) (HPO_4)]·7.5H_2O

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural chemistry 2002年第1期21卷 42-45页

作者： LIN Zheng-Zhong ZHANG Han-Hui HUANG Chang-Cang SUN Rui-Qing (Department of chemistry, fuzhou university, fuzhou 350002, china ) ( State Key Laboratory of Structural chemistry, fuzhou 350002, china ) Department of chemistry Fuzhou University Fuzhou 350002

The title compound (C5N5H41P2Mo5O30.5) was synthesized under hydrothermal condition and its crystal structure was determined by X-ray diffraction. It belongs to triclinic system, space group P , with a=9.9645(6), b=10.8666(7), c=15.814(1)? α=71.482(3), β=88.528(2), γ=78.448(2)°, V=1589.4(2)3, Dc=2.510g/cm3, Z=2,μ=2.138mm-1,λ(MoKα) = 0.71073 ? F(000)=1180. The final R and wR were 0.0396 and 0.1052 for 6626 observed reflections with I ≥2σ(I), respectively. The result of the structure analysis indicates that the [Mo5O15(PO4) (HPO4)]5- anion in the title compound consists of five edge-sharing or corner-sharing MoO6 octahedra and two corner-sharing PO4 tetrahedra. Each MoO6 octahedron adopts distorted octahedral geometry.

关键词： hydrothermal molybdenum phosphate crystal structure

Nitriding of Hard Fe Electrodepositionand Its Effects on Wear Resistance

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2001年第2期17卷 271-274页

作者： Chenghui GAO, Dajian CHEN and Baiyang ZHOU Department of Mechanical engineering, fuzhou university, Fujian, fuzhou 350002, china Dept. of Mech. Eng. Fuzhou Univ. Fuzhou 350002 China

Nitriding is employed for the hard Fe electrodeposition to produce a hard-facing and antiwear coating. It only takes 1 h for the hard Fe coating, which is much shorter than nitriding the Fe and steel. The results showed that the nitriding can increase the microhardness, wear resistance of the coating, as well as the bonding strength of the coating with the substrate. Additionally it can eliminate the brittleness, turn the internal stress of the coating from tension to compression. The wear resistance of the nitrided Fe coating is 4.6 times as high as that of Cr coating. It is simple and economic to combine hard Fe electroplating and nitriding, which is a good technology of the tribological surface modification.

关键词： Fe Nitriding of Hard Fe Electrodepositionand Its Effects on Wear Resistance

The preparation, structure and spectra properties of dual μ3-oxo bridged tetranuclear complexes containing the [CrnFe4-nO2]8+ core(n=0,2,4)

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of chemistry 1994年第6期12卷 534-541页

作者： PAN, Wen-YuDepartment of chemistry, Fujian Medical college, fuzhou, 350004 chinaYU, Xiu-FenDepartment of chemistry, fuzhou university, fuzhou, Fujian 350002 china Department of chemistry Pujian Medical College Fuzhou 350004 China Department of chemistry Fuzhou University Fuzhou Fujian 350002 China

The preparation and characterization of [CrnFe4-nO2(O2CMe)7(bipy)2]Cl (1, n=0; 2, n=2; 3, n=4, bipy=2,2'-bipyridine) are described. The three complexes (1, 2 and 3) are obtained by tipyridine-mediated conversion of trinuclear [CrnFe3-nO(O2CMe)6(H2O)3]+(1, n=0; 2, n=1;3, n=3), and crystallized as three of approximate isomorphs. Crystal 2 is monoclinic with space group C2/c, a=27.454(5)A, b=11.789(1)A, c=16.570(3)A, B=118.78(1), V=4700.8A, z=4, u(MoKa)=11.64cm-1, F(000)=2056, final R=0.058 and Rw=0.066 for 3479 reflections with I > 3o(I). The Fe and Cr atoms in the cation are all +3 oxide state and disordered in the lattice, which is also supported by its Mossbauer studies. The [Cr2Fe2O2]8+ core can be thought of as being derived from two edge-sharing M3O units (M=Fe or Cr), and as a butterfly-like structure. The cations' structure of all three crystals are similar to each other and have C2 symmetry. The species are characterized by IR spectra and magnetic techniques, with particular emphasis on differentiation of coordination bond strengths and electronic environment of metal atoms in these complexes.

关键词： Tetranuclear Cr-Fe complex synthesis crystal structure IR.

AN ASSESSMENT OF LAND USE CHANGES IN FUQING COUNTYOF china USING REMOTE SENSING TECHNOLOGY

在线全文

学校读者我要写书评

暂无评论

Chinese Geographical Science 2002年第2期12卷 126-135页

作者： XU Han-qiu( Department of Environmental and Resources engineering, fuzhou university, fuzhou 350002, P. R. china) Department of Environmental and Resources engineering Fuzhou University Fuzhou P. R. China

Fuqing County of southeast china has witnessed significant land use changes during the last decade. Re mote sensing technology using multitemporal Landsat TM images was used to characterize land use types and to monitor land use changes in the county. Two TM scenes from 1991 and 1996 were used to cover the county and a five-year time period. Digital image processing was carried out for the remotely sensed data to produce classified images. The images were further processed using GIS software to generate GIS databases so that the data could be further spatially analyzed taking the advantages of the software. Land use change areas were determined by using the change detection technique. The comparison of the two classified TM images using the above technologies reveals that during the five study years, a large area of arable lands in the county has been lost and deforestation has taken place largely because of the dramatic in crease in built-up land and orchard. The conclusive statistical information is useful to understand the processes, causes and impacts of the land use changes in the county. The major driving force to the land use changes in the county ap peared to be the rapid economic development. The decision makers of the county have to pay more attention to the land use changes for the county’s sustainable development.

关键词： land use change remote sensing GIS driving force

Studies on Mechanism of Chemiluminescence Reaction of 2, 6, 7-Trihydroxyl -9- (4'-chlorophenyl ) -3-fluoroner

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural chemistry 1998年第5期17卷 377-382页

作者： Xie Zeng-Hong (Department of chemistry, fuzhou university, fuzhou 350002) Department of chemistry Fuzhou University Fuzhou 350002 China

Catalytic chemiluminescence of over twenty metallic ions in the systemof 2, 6, 7-tihydroxyl-9- (4'-chlorophenyl)-3-fluorone (Cl-PF )-H2O2 has been *** amount of Co(Ⅱ) strong1y catalysed this chemiluminescence reaction, especiallyin presence of cationic surfactant cetyltrimethylammonium bromide (CTMAB), andthe chemiluminescence intensity was proportional to the concentraction of Co(Ⅱ) in therange 0. 5~6ng. ml-1 Co(Ⅱ). Two steps could be involved in the chemiluminescentreaction of C1-PF. In alkaline solution, the O2 radical ion should attack an oxygenbridge between the benzene rings of Cl-PF with break in oxygen bridge bond to produce reaction product which is excited by the energy derived from this chemical reaction. The electronic excited state emits the radiation(560 nm) on falling to the groundstate, followed by formation of polyphenol derivatives. the polyphenol derivatives arefurther oxidized to produce chemiluminescence (480 nm) which is due to emission fromsinglet oxygen.

关键词： 2 6 7-trihydroxyl-9-(4'-chlorophenyl)-3-fluorone chemiluminescence Huckel molecular orbital method

X-ray Study on the Ring-substituted Phthalocyanines:Crystal Structure of Metal Free 1,4,8,11,15,18,22,25-Octa-butyloxyphthalocyanine

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural chemistry 2002年第6期21卷 617-620页

作者： WANG Jun-Dong HUANG Jin-LingCAI Jin-Wan CHEN Nai-Sheng(Department of chemistry, fuzhou university, and State Key Laboratory of Structural chemistry,fuzhou 350002, china) Department of chemistry Fuzhou University State Key Laboratory of Structural Chemistry Fuzhou 350002

The crystal structure of 1,4,8,11,15,18,22,25-octa-butyloxyphthalocyanine was determined by X-ray diffraction methods. The crystal is of triclinic, space group P 1 with a = 14.0780(3), b = 14.3480(4), c = 17.0090(2) A, α = 72.156(2), β = 86.193(2), r= 73.655(2)°, C64H82N8O8, Mr = 1091.38, Z = 2, V = 3137.5(1) A3, Dc= 1.155 g/cm3, F(000) = 1172, μ(MoKα) = 0.077 mm-1, the final R = 0.0787 and wR = 0.2240 for 5795 observed reflections with I ≥ 2σ(I). The steric congestion between the neighboring butyloxy groups distorts the core of phthalocyanine into a saddle shape conformation. In the crystal lattice, molecules overlap to each other with π-π interaction but the extent of overlap is different along the three axial directions.

关键词： phthalocyanine crystal structure

Density functional theory for adsorption of HCHO on the FeO(100) surface

在线全文

学校读者我要写书评

暂无评论

Journal of Natural Gas chemistry 2010年第1期19卷 21-24页

作者： Lingling Wang, Wenkai Chen Department of chemistry, fuzhou university, fuzhou 350108, Fujian, china Department of chemistry Fuzhou University Fuzhou 350108 Fujian China

The density functional theory （DFT） and periodic slab model were used to get information concerning the adsorption of HCHO on the FeO（100） surface. A preferred η^2-（C,O）-di-σ four-membered ring adsorption conformation on the Fe-top site was found to be the most favorable structure with the predicted adsorption energy of 210.7 kJ/mol. The analysis of density of states, Mulliken population, and vibrational frequencies before and after adsorption showed clear weakening of the carbonyl bond, and high sp^3 character on the carbon atom.

关键词： density functional theory formaldehyde iron monoxide adsorption