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Stabilization of formamidinium lead iodide perovskite precursor solution for blade-coating efficient carbon electrode perovskite solar cells

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Chinese Physics B 2021年第8期30卷 176-181页

作者： Yu Zhan Weijie Chen fu Yang Yaowen Li Laboratory of Advanced optoelectronic Materials College of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China

formamidinium lead triiodide(fAPbI_(3))is a research hotspot in perovskite photovoltaics due to its broad light absorption and proper thermal ***,quite a few researches focused on the stability of the fAPbI_(3) perovskite precursor ***,the most efficient fAPbI_(3) layers are prepared by the spin-coating method,which is limited to the size of the ***,the stability of fAPbI_(3) perovskite solution with methylammonium chloride(MACl)or cesium chloride(CsCl)additive is studied for preparing perovskite film through an upscalable blade-coating *** additive works well for achieving a high-quality fAPbI_(3) film,resulting in efficient carbon electrode perovskite solar cells(pero-SCs)in the ambient ***,the perovskite solution with MACl additive shows poor aging stability that noα-fAPbI_(3) phase is observed when the solution is aged over one *** the perovskite solution with CsCl additive shows promising aging stability that it still forms high-quality pureα-fAPbI_(3) perovskite film even the solution is aged over one *** the solution aging process,the MACl could be decomposed into methylamine which will form some unfavored intermediated phase inducingδ-phase fAPbI_(3).Whereas,replacing MACl with CsCl could effectively solve this *** founding shows that there is a great need to develop a non-MACl fAPbI_(3) perovskite precursor solution for cost-effective preparation of pero-SCs.

关键词： perovskite precursor solution formamidinium lead iodide blade-coating carbon electrode

Assembly of lamins in vitro

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Cell Research 1996年第1期6卷 11-22页

作者： MIN GUNG WEI XIANG JUN ToNG BIN CHEN BoZHANG ZHoNG fAN LIU MING XIAo DING ZHoNGHE ZHAI(college of Life Sciences, Peking Universitycollege of chemistry and Molecular Engineering, PekingUniversity Beijing 100871, China.) college of Life Sciences Peking University college of chemistry and Molecular Engineering Peking University Beijing China

After lamins A, B and C were isolated and purified from rat liver, their assembly properties were examined by electron microscopy and scanning tunneling microscopy using negative staining and the glycerol coating method,respectively By varying the assembly time or the ionic conditions under which polymerization takes place, we have observed different stages of lamin assembly, which may provide clues on the structure of the 10 nm lamin filaments. At the first level of structural organization, two lamin polypeptides associate laterally into dimers with the two domains being parallel and in register. At the second level of structural organization, two dimers associate in a half-staggered and atiparallel fashion to form a tetramer 75 nm in length. At the third level of structural organization, 4-10 lamin tetramers associate laterally in register to form 75 nm long 10nm filaments, which in turn combine head to head into long, fully assembled lamin *** assembled lamin filaments are nonpolar.

关键词： Nuclear lamina lamins scanning tunneling microscopy assembly

fe_(2)o_(3)-MWNTs Composite with Reinforced Concrete Structure as High-performance Anode Material for Lithium-ion Batteries

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Chemical Research in Chinese Universities 2023年第2期39卷 240-245页

作者： WANG Suhang ZUo Jinxin LI Yongliang ZHoNG Yiming REN Xiangzhong ZHANG Peixin SUN Lingna college of chemistry and Environmental Engineering Shenzhen UniversityShenzhen518060P.R.China Babel International college PerthWA6100Australia

A fe_(2)o_(3)-MWNTs(multi-walled carbon nanotubes)composite with a reinforced concrete structure was fabricated employing a two-step method which involves a sol-gel process followed by high-temperature in situ *** fe_(2)o_(3)-MWNTs composite,intended to be used as an anode material for lithium-ion batteries,maintained a reversible capacity as high as 896.3 mA·h/g after 100 cycles at a current density of 100 mA/g and the initial coulombic efficiency reached 75.5%.The rate capabilities of the fe_(2)o_(3)-MWNTs composite,evaluated using the ratios of capacity at 100,200,500,1000,2000 and 100 mA/g after every 10 cycles,were determined to be 904.7,852.1,759.0,653.8,566.8 and 866.3 mA·h/g,*** a superior electrochemical performance of the fe_(2)o_(3)-MWNTs composite is mainly attributed to the reinforced concrete construction,in which the MWNTs function as the skeleton and conductive *** a structure contributes to shortening the transport pathways for both Li+and electrons,enhancing conductivity and accommodating volume expansion during prolonged *** fe_(2)o_(3)-MWNTs composite with the designed structure is a promising anode material for high-performance lithium-ion batteries.

关键词： Lithium-ion battery Anode material fe_(2)o_(3)-multi-walled carbon nanotubes(MWNTs)composite Sol-gel Reinforced concrete structure

Mechanically Strong Janus Poly(N-isopropylacrylamide)/Graphene oxide Hydrogels as Thermo-responsive Soft Robots

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Chinese Journal of Polymer Science 2017年第10期35卷 1268-1275页

作者： xin peng tian-qi liu cong shang chen jiao 汪辉亮 Beijing Key Laboratory of Energy Conversion and Storage Materials College of Chemistry Beijing Normal University Beijing 100875 China

Simple preparation of stimuli-responsive hydrogels with good mechanical properties and mild stimuliresponsiveness is essential for their applications as smart soft robots. Mechanically strong Janus poly（Nisopropylacrylamide）/graphene oxide（PNIPAM/Go） nanocomposite hydrogels with stimuli-responsive bending behaviors are prepared through a simple one-step method by using molds made of a Teflon plate and a glass plate. Residual oxygen in the air bubbles on the Teflon plate surface affects the polymerization and hence the cross-linking density, leading to the different swelling/deswelling rates of the two sides of the gels. Therefore, the hydrogels exhibit bending/unbending behaviors upon heating/cooling in water. The incorporation of Go nanosheets dramatically enhances the mechanical properties of Janus hydrogels. Meanwhile, the photo-responsive property of the Go nanosheets also imparts the hydrogels with remotecontrollable deformation under IR irradiation. The application of the Janus PNIPAM/Go hydrogels as thermo-responsive grippers is demonstrated.

关键词： evaporation tough evident biomedical excess tensile hydrogel breaking ionic antimicrobial

Synergistic extraction of praseodymium with 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester and 8-Hydroxyquinoline

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Journal of Shanghai University(English Edition) 2009年第1期13卷 72-75页

作者：张倩乌东北包伯荣 Department of chemistry College of SciencesShanghai University Department of chemistry Tongji University

The synergistic extraction of Pr^3＋ from hydrochloric medium using mixture of 2-ethylhexyl phosphonic acid mono- 2-ethylhexyl ester （P507, HL） and 8-Hydroxyquinoline （HQ） in heptane was investigated. The effect of equilibrium of aqueous acidity on extraction of Pr^3＋ was discussed. The effect of extractant concentraction, different diluents, equilibrium time and acetate ion concentration oil extraction reaction were also studied. With a method of double-logarithmic slope, composition of the extracted species on 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester and 8-Hydroxyquinoline was derived. The result shows that the synergistic extraction system not only overcomes emulsification of 8-Hydroxyquinoline, but also shows perfect capacity of synergistic extraction. The largest synergistic enhancement factor can be calculated to be 5.49 at pH 3.6 for Pr^3＋.

关键词： 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester 8-Hydroxyquinoline (HQ) synergistic extraction,praseodymium

Graphene oxide-derived single-atom catalysts for electrochemical energy conversion

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Rare Metals 2022年第5期41卷 1703-1726页

作者： Jian-Bin Liu Hai-Sheng Gong Gong-Lan Ye Hui-Long fei State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China

Sustainable electrochemical energy conversion is considered as a promising solution to energy crises and environmental issues. owing to their maximized utilization efficiency and excellent catalytic performance, single-atom catalysts(SACs) have obtained tremendous attention in the field of electrochemical energy conversion. In the last few years, graphene oxide(Go) has been considered to be a promising precursor for fabricating graphene-supported SACs due to its advantageous features such as large surface area, high density of intrinsic defects, and scalability. In this review, the recent advances in the preparation of graphene oxide-derived single-atom catalysts(Go-SACs) and their diverse electrochemical applications are ***, the synthetic strategies of Go-SACs are discussed with focuses on the advantages and shortages of each method. Subsequently, the electrochemical applications of Go-SACs in various energy conversion processes,including the oxygen reduction reaction(oRR), oxygen evolution reaction(oER), hydrogen evolution reaction(HER), nitrogen reduction reaction(NRR), and carbon dioxide reduction reaction(Co;RR), are discussed in detail. finally, the remaining challenges and future prospects in the fabrication and application of Go-SACs are presented.

关键词： Single-atom catalysts Graphene oxide Electrocatalysis Energy conversion

Mercuric ions induced aggregation of gold nanoparticles as investigated by localized surface plasmon resonance light scattering and dynamic light scattering techniques

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Science China chemistry 2013年第6期56卷 806-812页

作者： WANG Wei LIU Chun LING Jian HUANG ChengZhi college of Pharmaceutical Sciences Southwest University Education Ministry Key Laboratory on Luminescence and Real-Time Analysis College of Chemistry and Chemical EngineeringSouthwest University

With the development of nanosciences, both localized surface plasmon resonance light scattering （LSPR-LS） and dynamic light scattering （DLS） techniques have been widely used for quantitative purposes with high sensitivity. In this contribution, we make a comparison of the two light scattering techniques by employing gold nanoparticles （AuNPs） aggregation induced by mercuric ions. It was found that citrate-stabilized AuNPs got aggregated in aqueous medium in the presence of mercuric ions through a chelation process, resulting in greatly enhanced LSPR-LS signals and increased hydrodynamic diameter. The enhanced LSPR-LS intensity （A/） is proportional to the concentration of mercuric ions in the range of 0.4-2.5 laM following the linear regression equation of A/= -84.7＋516.4c, with the correlation coefficient of 0.983 （n = 6） and the limit of determi- nation （3o-） about 0.10 gM. on the other hand, the increased hydrodynamic diameter can be identified by the DLS signals only with a concentration of Hg2＋ in the range of 1.0-2.5 gM, and a linear relationship between the average hydrodynamic diame- ters of the resulted aggregates and the concentration of Hg2＋ can be expressed as d = -6.16 ＋ 45.9c with the correlation coeffi- cient of 0.994. In such case, LSPR-LS signals were further applied to the selective determination of mercuric ions in lake water samples with high sensitivity and simple operation.

关键词： gold nanoparticles (AuNPs) localized surface plasmon resonance light scattering (LSPR-LS) dynamic light scattering(DLS) mercury aggregation

Synthesis of spiro-cyclopropane derivatives containing multiple chiral centers

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Science China chemistry 1999年第3期42卷 268-276页

作者：黄慧陈庆华 1. Department of chemistry Beijing Normal University 100875 Beijing China 2. Department of chemistry Tonghua Teacher’s College 134002 Tonghua China

Tandem asymmetric double Michael addition/internal nucleophilic substitution of the novel chiral source, 5-(l-menthyloxy)-3-bromo-2(5H)-furanone with nucleophilic alcohol compounds has been investigated. The tandem asymmetric reaction can afford four new stereogenic centers with one reaction and give optically pure spiro-cyclopropane derivatives 5a--5d which are difficult to obtain by routine methods. The synthetic method for 5a--5d was studied in detail and the new compounds were identified on the basis of their analytical data and spectroscopic data, such as [α]^(20),IR,~1H NMR,^(13)C NMR, MS and elementary analysis. The absolute configuration of the sprio [5-l-menthyloxy-3-bromo butyrolactocyclopropane-3″, 3′(4′-methyloxy-5′-menthyloxybutyrolactone)] (5a) was established by X-ray crystallography. The work can provide important synthetic strategy in synthesis of some new optically active spiro-cyclopropane analogues and some biologically active molecules with complex structure.

关键词： 5-( l-menthyloxy)-3-bromo-2(5H)-furanone tandem reaction asymmetric double Michael addition /internal nucleophilic substitution crystal structure spiro-cyclopropane derivatives with multiple chiral centers.

Hybrid density functional study on lattice vibration,thermodynamic properties,and chemical bonding of plutonium monocarbide

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Chinese Physics B 2016年第6期25卷 416-425页

作者：杨荣唐斌高涛敖冰云 Institute of Atomic and Molecular Physics Sichuan University Chengdu 610065 China college of Materials Science and Engineering Chongqing Jiaotong University Chongqing 400074 China Institute of finance & Trade Chongqing City Management College Chongqing 401331 China Science and Technology on Surface Physics and chemistry Laboratory P. O. Box 718-35 Mianyang 621907 China

Hybrid density functional theory is employed to systematically investigate the structural,magnetic,vibrational,thermodynamic properties of plutonium monocarbide（Pu C and Pu C0.75）.for comparison,the results obtained by DfT,DfT ＋ U are also *** Pu C and Pu C0.75,fock-0.25 hybrid functional gives the best lattice constants and predicts the correct ground states of antiferromagnetic（AfM） *** calculated phonon spectra suggest that Pu C and Pu C0.75 are dynamically *** of the Helmholtz free energy ？f,internal energy ？E,entropy S,and constant-volume specific heat Cv of Pu C and Pu C0.75 are *** results are in good agreement with available experimental or theoretical *** for the chemical bonding nature,the difference charge densities,the partial densities of states and the Bader charge analysis suggest that the Pu–C bonds of Pu C and Pu C0.75 have a mixture of covalent character and ionic *** effect of carbon vacancy on the chemical bonding is also discussed in *** expect that our study can provide some useful reference for further experimental research on the phonon density of states,thermodynamic properties of the plutonium monocarbide.

关键词： hybrid functional DfT+U plutonium monocarbide