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Journal of Energy Chemistry 2022年第11期31卷 404-411,I0011页

作者： Weijian Wu Zhen Gao Qun Li Zhiya Wang Shiyin Liu Hongbo Wu Yuanchun Zhao Yalong Jiao Xiaojia Zhao Hebei Key Laboratory of Inorganic Nano-materials College of Chemistry and Materials ScienceHebei Normal UniversityShijiazhuang 050024HebeiChina Hebei Key Laboratory of Photophysics Research and Application College of PhysicsHebei Normal UniversityShijiazhuang 050024HebeiChina State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004HebeiChina

A mixture of Ni and Fe oxides is among the most commonly active catalysts for the oxygen evolution reaction(OER)during the water oxidation *** particular,Ni oxide incorporated with even a small amount of Fe leads to substantively enhanced OER ***,the critical role of Fe species during the electrocatalytic process is still under ***,we report nickel(oxy)hydroxide incorporated with Fe through the surface reconstruction of a bimetallic metal-organic framework(NiFe-MOF)during the water oxidation *** spectroscopic investigations with theoretical calculations reveal the critical role of Fe in promoting the formation of highly oxidized Ni^(4+),which directly correlates with an enhanced OER *** the geometric and electronic structu res of the as-reconstructed Ni_(1-x)Fe_(x)OOH electrocatalysts can be delicately tuned by the Ni-Fe ratio of the bimetallic NiFe-MOF,further affecting the catalytic *** a result,the Ni_(1-x)Fe_(x)OOH derived from Ni_(0.9)Fe_(0.1)-MOF delivers low overpotentials of 260 mV at 10 mA cm^(-2)and 400 mV at 300 mA cm^(-2).

关键词： structural transformation Bimetallic metal-organic framework Oxygen evolution reaction In-situ Raman spectroscopy High-valence metal sites

structural transformation of FePt nanocomposite films during annealing and its effects on magnetic properties

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Rare Metals 2006年第z1期25卷 588-591页

作者： ZHAN Xiaoyuan ZHANG Yue GU Yousong LI Jianmin Department of Materials Physics and Chemistry University of Science and Technology Beijing Beijing 100083 China Department of Materials Physics and Chemistry University of Science and Technology Beijing Beijing 100083 China Department of Materials Physics and Chemistry University of Science and Technology Beijing Beijing 100083 China Department of Materials Physics and Chemistry University of Science and Technology Beijing Beijing 100083 China

Fe100-xPtx(x=30at.%-60at.%) nanocomposite films were deposited on natural-oxidized Si(100) substrates by magnetron sputtering. The as-deposited films were annealed between 373 and 1073 K. In situ X-ray diffraction shows that the FePt nanocomposite films undergo a phase transformation from a disordered FCC phase to an ordered L10 phase between 673 and 773 K. The coercivity is 306 kA·m-1 whiles the average grain sizes is about 10 nm in the optimized FePt alloy film sample annealed at 673 K. The adjustable coercivity and fine grain size suggest that this FePt nanocomposites system is suitable as recording media at extremely high areal density.

关键词： structural transformation annealing process magnetic properties recording media

structural transformation,TFP and High-Quality Development

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China Economist 2022年第1期17卷 70-82页

作者： Liu Zhibiao Ling Yonghui Yangtze River Industrial Economic Research Institute Nanjing UniversityNanjingChina

In this paper,we performed an empirical study on the TFP effect of structural transformation based on panel data of economic growth in 169 countries across the *** findings are threefold:First,structural transformation has an inverted U-shaped effect on *** the degree of structural transformation is on the left side of the inflection point,structural transformation is conducive to softening industrial structure and inducing TFP;when the degree of structural transformation is on the right side of the inflection point,structural transformation will induce industrial hollowing out and inhibit ***,since the reform and opening up program was launched in 1978,China’s structural transformation has evolved from the stage of adaptation to the stage of strategic adjustment with an increasingly evident trend towards a service-based economy,but structural transformation remains on the left side of the inflection point of the inverted U-shaped curve,*** TFP effect of structural transformation is ***,TFP improvement lies at the heart of high-quality *** pursuing high-quality development,China should lower growth rate expectations,attach greater importance to supply-side structural reforms,and accelerate structural transformation to promote TFP improvement.

关键词： Economic growth structural transformation TFP high-quality development

An old story with new insight into the structural transformation and radical production of micron-scale zero-valent iron on successive reactivities

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Chinese Chemical Letters 2020年第10期31卷 2634-2640页

作者： Xinhao Wang Xueting Pu Yue Yuan Yunjie Xiang Yuling Zhang Zhaokun Xiong Gang Yao Bo Lai State Key Laboratory of Hydraulics and Mountain River Engineering College of Architecture and EnvironmentSichuan UniversityChengdu 610065China Sino-German Centre for Water and Health Research Sichuan UniversityChengdu 610065China National Engineering Laboratory for Clean Technology of Leather Manufacture College of Biomass Science and EngineeringSichuan UniversityChengdu 610065China Institute of Environmental Engineering RWTH Aachen UniversityAachen 52062Germany

It is generally recognized that the formation and accumulation of iron oxides on the surface of zero-valent iron(Fe^(0))resulting in significant decrease of contaminant degradation rates during the long-term ***,in this study,we found that the removal efficiencies of p-nitrophenol(PNP)by micro zero-valent iron(mFe^(0))could maintain at the satisfactory level in the process of continuous reactions(20 cycles).The removal rate constant(0.1779 min^(-1))of the 5th cycle was 6.74 times higher than that of the 1streaction(0.0264 min^(-1)),even the 20th cycle(0.0371 min^(-1))was higher than that of the 1st ***,almost no dissolved iron was detected in the solution,and the total iron concentrations decreased dramatically with the process of continuous *** results of scanning electron microscope and energy dispersive spectrometry(SEM-EDS)and X-ray diffraction(XRD)revealed that the structure and composition of corrosion products change from amorphous to highly crystal with the increase of the number of *** corrosion products were mainly magnetite(Fe_(3)O_(4))and a small part of maghemite(γ-Fe_(2)O_(3)),which were in the form of micro sphe res on the surface of mFe^(0).The formation of surface oxidation shell hindered the release of Fe^(2+).X-ray photoelectron spectroscopy(XPS)results illustrated that partial Fe3O_(4) could be converted into y-Fe_(2)O_(3).Electrochemical analysis proved that the electron transfer rate of mFe^(0) increased with the formation of the oxides ***,the consumption of iron core and thicker oxide film weakened the electron transfer ***,the quenching experiments indicated that the reaction activity of mFe^(0) could be enhanced with the addition of *** study deepened the understanding of the structural transformation and radical production of mFe^(0) in continuous reactions.

关键词： Zero-valent iron Iron oxides p-Nitrophenol structural transformation Successive reactivities

Hcp-icosahedron structural transformation induced by the change in Ag concentration during the freezing of (CoAg)_(561) clusters

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Chinese Physics B 2012年第4期21卷 424-427页

作者：肖绪洋 School of Electronics Engineering Chongqing University of Arts and SciencesChongqing 402160China

The synergy effect of alloy elements in bimetallic clusters can be used to tune the chemical and physical properties. Research on the influences of alloy concentration and distribution on the frozen structure of bimetallic clusters plays a key rolc in exploring new structural materials. In this paper, we study the influence of Ag concentration on the frozen structure of the （AgCo）561 cluster by using molecular dynamics simulation with a general embedded atom method. The results indicate that tt^e structure and chemical ordering of the （AgCo）561 cluster are strongly related to Ag concentration. Hcp-icosahedron structural transformation in the frozen （CoAg）561 cluster can be induced by changing Ag concentration. The chemical ordering also transforms to Janus-like Co Ag from core-shell Co-Ag.

关键词： bimetallic cluster freeze molecular dynamics structural transformation

A Unique Solvent-Induced structural transformation of Two Acentric [Zn2（H2O）（Hdtim）2] Isomers

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Chinese Journal of Chemistry 2012年第9期30卷 2232-2236页

作者：党琴琴冀芳张献明 School of Chemistry&Material Science Shanxi Normal UniversityLinfenShanxi 041004China

Solvent-induced structural transformation was observed in two layered supramolecular isomers of [Zn2（H2O）（Hdtim）2] （H3dtim--4,5-ditetrazoyl-imidazole）. structural analyses revealed that the two isomers have the similar geometry of Zn, coordination mode of Hdtim2-, and topology. Their structural differences only arise from different arrangement of the layers which seemingly corresponds to cooperative clockwise and counter-clockwise 90° rotation of the adjacent layers. This is a quite unique solvent-dependent supramolecular isomerism in coordination polymers.

关键词： structural transformation isomers packing fashion

Thermally induced structural transformation of polytriazoleimide to polyindoleimide

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Chinese Chemical Letters 2012年第9期23卷 1087-1090页

作者： Yan Peng E Li Qiang Wan Yu Jing Li Fa Rong Huang Lei Du Key Laboratory for Specially Functional Polymeric Materials and Related Technology of the Ministry of Education School of Materials Science and EngineeringEast China University of Science and TechnologyChina Shanghai 200237

A new kind of polytriazoleimide containing bisphenyl-l,2,3-triazole （BPT） was synthesized by copper-catalyzed 1,3-dipolar cycloaddition of azides and alkynes （CuAAC） and polycondensation. The thermal stability and degradation mechanism of the polytriazoleimide were investigated. The results show that the structure of BPT in polytriazoleimide transforms to phenylindole after thermal treatment, accompanying the release of NE.

关键词： Polytriazoleimide structural transformation Phenylindole Thermal stability

A rare porous zinc phosphonocarboxylate framework with high thermal stability and interesting structural transformation

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Chinese Chemical Letters 2018年第6期29卷 959-962页

作者： Yan-Jie Qi Jin-Hua Liu Wen-Xu Zheng Xin-Xiong Li Shou-Tian Zheng State Key Laboratory of Photocatalysis on Energy and Environment College of Chemistry Fuzhou University

A rare porous zinc-organic framework with ultrahigh thermal stability over 500℃ was obtained, which exhibits a CaF2-type topology formed by 8-connected tetranuclear Zn4 clusters and 4-connected phosphonocarboxylate ligands. Interestingly, the similar reactions to the 2 zinc-organic framework but in the absence of H2 O or by the replacement of Zn2＋with Co2＋can yield three different 3 D cluster-based frameworks but with the same CaF2-type topology.

关键词： Phosphonocarboxylate ligand Metal-organic framework Stability structural transformation Gas adsorption

Anion-induced differential assembly and structural transformation of supramolecular coordination cages

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Chinese Chemical Letters 2024年第3期35卷 268-272页

作者： Shao-Ping Zheng Yao-Wei Xu Pei-Yang Su Chen-Hui Liu Yin-Hui Huang Yu-Lin Lu Zhang-Wen Wei Zhiwei Jiao Hai-Sen Xu Cheng-Yong Su MOE Laboratory of Bioinorganic and Synthetic Chemistry Lehn Institute of Functional MaterialsSchool of ChemistrySun Yat-sen UniversityGuangzhou 510006China Institute of Environmental Research at Greater Bay Area Guangzhou UniversityGuangzhou 510006China State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic ChemistryChinese Academy of SciencesShanghai 200032China

The intimate host-anion interactions will regulate thermodynamics and kinetics in the self-assembly of cationic cages mimicking biological ***,we report construction and transformation of three Pd(Ⅱ)-based metal-organic cages(MOCs)depending on different *** conversions of the lantern-shaped MOC-34 into either octahedral MOC-35 or tricapped trigonal prism MOC-36 are induced by BF_(4)^(–)or NO_(3)^(–),***-36 is kinetically favored and can undergo quantitative conversion to the thermodynamically preferred MOC-35 upon heating,accelerated by excess BF_(4)^(–)to motivate dissociative dynamics of Pd-vertices and lower activation barrier of cage *** guest encapsulation behaviors of MOC-35 and MOC-36 have also been *** results manifest a significance of host-anion dynamics beyond complementary anion template,shedding light on the understanding of intricate anion recognition in nature.

关键词： Supramolecular coordination cage Dynamic host-anion interactions structural transformation Anion receptor Guest inclusion

Spectroscopic Analysis of structural transformation in Biodiesel Oxidation

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China Petroleum Processing & Petrochemical Technology 2013年第3期15卷 28-32页

作者： Wu Jiang Chen Boshui Fang Jianhua Wang Jiu Department of Petrochemistry Logistical Engineering University

The oxidation behavior of three biodiesels of different origins,*** oil derived biodiesel,soybean oil derived biodiesel and waste oil based biodiesel,were tested on an oxidation *** chemical compositions of the biodiesels were characterized by gas ***,the structural transformation of fatty acid methyl ester(FAME)of the biodiesels was analyzed by an infrared spectrometer and an ultraviolet absorption *** results demonstrated that the oxidation behavior of biodiesels of different origins was closely related to the composition and distribution of *** concentration of unsaturated FAME with multi-double bonds exhibited poorer oxidation ***,cis-trans isomerization transformation occurred in the unsaturated FAME molecules and conjugated double-bond produced during the oxidation process of *** cis-trans variations corresponded to deeper oxidation *** higher the content of unsaturated FAME with multi-double bonds in a biodiesel,the more the conjugated double bonds was formed.

关键词： biodiesel oxidation structural transformation spectroscopic analysis