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Phase engineering of MXene Derivatives Via molecular Design for High-Rate Sodium-Ion Batteries

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Energy & Environmental Materials 2024年第05期7卷 126-134页

作者： Hui Zhang Xingwu Zhai Xin cao Zhihao Liu Xinfeng Tang Zhihong Hu Hang Wang Zhandong Wang Yang Xu wei He wei Zheng Min Zhou Zheng Ming Sun Hefei National Laboratory for Physical Sciences at the Microscale School of Chemistry and Materials Science University of Science and Technology of China School of Materials Science and engineering Southeast University National Synchrotron Radiation Laboratory University of Science and Technology of China Department of chemistry University College London School of chemistry and Chemical engineering Southeast University

Since 2019, research into MXene derivatives has seen a dramatic rise; further progress requires a rational design for specific functionality. Herein, through a molecular design by selecting suitable functional groups in the MXene coating, we have implemented the dual N doping of the derivatives,nitrogen-doped TiO2@nitrogen-doped carbon nanosheets （N-TiO2@NC）, to strike a balance between the active anatase TiO2at low temperatures, and carbon activation at high temperatures. The NH3.eduction environment generated at 400℃as evidenced by the in situ pyrolysis SVUV-PIMS process is crucial for concurrent phase engineering. With both electrical conductivity and surface Na+availability, the N-TiO2@NC achieves higher interface capacitive-like sodium storage with long-term stability. More than100 mAh g-1is achieved at 2 A g-1after 5000 cycles. The proposed design may be extended to other MXenes and solidify the growing family of MXene derivatives for energy storage.

关键词： high-rate sodium-ion batteries molecular design MXene derivative phase engineering

Biological decomposition of Na_2S_2O_3.into sulfur by a newly isolated facultative thermophilic alkaline desulphuricant strain

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Science china chemistry 2009年第2期52卷 226-230页

作者： ZHANG JianBin1,ZHANG Tong2,MA Kai2,ZHANG PengYan2,LI Qiang2 & wei XiongHui1 1 Department of Applied chemistry,college of chemistry & molecular engineering,peking university,Beijing 100190,china 2 college of Chemical engineering,Inner Mongolia university of Technology,Huhhot 010051,china 1. Department of Applied chemistry College of Chemistry & Molecular Engineering Peking University Beijing 100190 China 2. college of Chemical engineering Inner Mongolia University of Technology Huhhot 010051 China

A facultative thermophilic alkaline desulphuricant strain named GDJ-3.was isolated from neutral soils,enriched on sulfur synthetic medium,and detected in previous *** and chemotax-onomic analyses and 16s RNA gene sequencing showed that the strain was in good agreement with Alpha proteobacterium sp.(97%) and ochrobactrum sp.(98%).The regenerative processes of the solu-tion containing sulfur compounds(SCS) from the strain through an orthogonal test were investigated to get the optimum regenerative *** results showed that regenerative temperature,air flow,and stirring speed of the agitator were the main three variables influencing the regenerative processes of the *** optimum regenerative efficiency of the SCS from the strain was obtained when tem-perature,air flow,and stirring speed of the agitator were 3.8.2 K,3.0 L/min,and zero r/min,*** this condition,when the cell concentration of the strain was adjusted to 107/mL,the concentra-tions of Na2S2O3.and Na2S in the SCS decreased from 112.68 g/L to 96.88 g/L and from 0.87 g/L to 0.11 g/L in 9.5 ***,XRD spectrum shows that sulfur was formed in the regeneration *** results suggest that the strain has potential application to the regeneration of the industrial so-lution containing sulfur compounds.

关键词： bio-desulfurization thermophiles optimization biocomposition orthogonal test

RuO_(2)/TiO_(2)/MXene with multi-heterojunctions coating on carbon cloth for high-activity chlorine evolution reaction at large current densities

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Nano Research 2024年第6期17卷 4764-4772页

作者： Yuhao Duan Liuxu wei Chenyu Cai Junbao Mi Fuyuan cao Jiaze Chen xiaolong Li Xiujiang Pang Bin Li Lei Wang Key Laboratory of Eco-chemical engineering Ministry of EducationInternational Science and Technology Cooperation Base of Eco-chemical Engineering and Green ManufacturingCollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042China college of Materials Science and engineering Qingdao University of Science and TechnologyQingdao 266042China college of Environment and Safety engineering Qingdao University of Science and TechnologyQingdao 266042China

The chlorine evolution reaction(CER)is a crucial step in the production of chlorine gas and active chlorine by chlor-alkali ***,the endeavor to fabricate electrodes capable of yielding high current density at minimal overpotential remains a central challenge in advancing the realm of chlorine evolution ***,we grow TiO_(2)and RuO_(2)on MXene@carbon cloth(CC)through the favorable affinity and induced deposition effect between the surface functional groups of MXene and the metal.A self-supported electrode(RuTiO_(2)/MXene@CC)with strong binding at the electrocatalyst-support interface and weak adhesion at electrocatalyst-bubble interface is *** RuTiO_(2)/MXene@CC can reduce the electron density of RuO_(2)by regulating the electron redistribution at the heterogeneous interface,thus enhancing the adsorption of Cl−.RuTiO_(2)/MXene@CC could achieve a high current density of 1000 mA·cm^(−2)at a small overpotential of 220 mV,superior to commercial dimensionally stable anodes(DSA).This study provides a new strategy for constructing efficient CER catalysts at high current density.

关键词： chlorine evolution reaction high current density MXene TiO_(2) RuO_(2)

Synthesis and ordered aggregation in water of a blue light-emitting PEO-PHP-PEO triblock oligomer

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Chinese Science Bulletin 2003年第15期48卷 1525-1530页

作者： HE Haifeng, cao Hongqing, WAN Xinhua, TU Yingfeng, CHEN xiaofang & ZHOU Qifeng Department of Polymer Science and engineering, {3. of chemistry and molecular engineering, peking university, Beijing 100871, china Correspondence should be addressed to Wan Xinhua (e-mail: xhwan@***) Department of Polymer Science and engineering College of Chemistry and Molecular Engineering Peking University

A novel blue light-emitting coil-rod-coil triblock oligomer, PEO-PHP-PEO, which consists of para-hexaphenyl (PHP) as the rigid rod and poly(ethylene oxide) (PEO, M w = 750) as the flexible coil, has been synthesized. It is the first soluble poly(para-phenylene) molecule containing no lateral substituent, which can dissolve not only in organic solvents such as chloroform and THF, but also in water. The critical micelle concentration (CMC) of PEO-PHP-PEO in water is 5.25×10-4 mol·L-1 and the surface tension at CMC, 鉉MC, is 61.29 mN·m-1. The absorption peak of the molecularly dissolved PEO-PHP-PEO in water is centered at 3.3.nm and the fluorescence spectrum has a maximum at 43. nm and shows the vibronic fine structure typical of molecular dissolution. The photoluminescence spectrum of the aggregate solution is similar to that of the PHP polycrystal film, indicating that the ordered packing of PHP block has taken place due to a combination of hydrophobic interaction and p-p stacking. The oligomer self-assembles into cotton-like nanofibers with diameter of about 20 nm in 5.0×10-3.mol·L-1 aqueous solution.

关键词：合成工艺低聚物聚乙烯荧光光谱 PHP 对六苯基

Measurement of Monomer Reactivity Ratios of D,L-3.Methylglycolide with Glycolide or D,L-Lactide

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Chinese Chemical Letters 2000年第9期11卷 815-818页

作者： Chang Ming DONG Kun Yuan QIU Zhong wei GU Xin De FENG Department of Polymer Science and engineering, college of {3. and molecular engineering, peking university, Beijing 100871 National Research Institute for Family Planning, Beijing 100081 peking Univ Coll Chem & Mol Engn Dept Polymer Sci & Engn Beijing 100871 Peoples R China Natl Res Inst Family Plannning Beijing 100081 Peoples R China

For monomer reactivity ratios study, the copolymerization of D,L-3.methylglycolide (MG) with glycolide (GA) or D,L-lactide (LA) was carried out in bulk to a certain low conversion in the presence of stannous octoate at 140 degrees C. The copolymer compositions were determined by H-1 NMR spectroscopy. The monomer reactivity ratios were evaluated by Fineman-Ross method, Kelen-Tudos method and linear least-squares method. The monomer reactivity ratios of D,L-3.methylglycolide and glycolide or D,L-lactide are r(mg)= 0.73. r(ga)= 1.47; r(mg)= 1.71, r(la)= 0.92, respectively.

关键词： D,L-3.methylglycolide glycolide D,L-lactide ring-opening copolymerization monomer reactivity ratios

FABRICATION OF SELF-ASSEMBLY DNA-C_(60) MULTILAYER FILMS

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Chinese Journal of Polymer Science 2002年第6期20卷 591-593页

作者： Shu-guang Yang Yong-jun Zhang Xin-hua Dai Wen-hong Tang Chun-yan Liu wei-xiao cao Yu-liang Li Jian Xu State Key Laboratory of Polymer Physics and {3., Institute of {3., Chinese Academy of Sciences,Beijing 100080, china Technology Institute of Physics and {3. Chinese Academy of Sciences, Beijing 100101, china college of {3. and molecular engineering peking {13. Beijing 100871, china Chinese Acad Sci Inst Chem State Key Lab Polymer Phys & Chem Beijing 100080 Peoples R China Chinese Acad Sci Technol Inst Phys & Chem Beijing 100101 Peoples R China peking Univ Coll Chem & Mol Engn Beijing 100871 Peoples R China

Electrostatic layer-by-layer self-assembly multilayer films were successfully fabricated from C-60-ethylenediamine adduct (C-60-EDA) and DNA. Under visible light irradiation, DNA is ready to be cleaved and the films a... 详细信息

关键词： self-assembly photo-induced cleavage DNA C-60

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, {3. universitycollege of chemistry and molecular engineering, {3.university Beijing 100871, china.) college of chemistry and molecular {3. Peking University Beijing 100871 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

Strong metal-support interactions between highly dispersed Cu^(+) species and ceria via mix-MOF pyrolysis toward promoted water-gas shift reaction

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Journal of Energy chemistry 2024年第4期91卷 475-483页

作者： xiao-Chen Sun Xing-Chi Li Ze-wei Xie Chen-Yue Yuan De-Jiu Wang Qian Zhang xiao-Yu Guo Hao Dong Hai-Chao Liu Ya-Wen Zhang Beijing National Laboratory for molecular Sciences(BNLMS) State Key Laboratory of Rare Earth Materials Chemistry and ApplicationsPKU-HKU Joint Laboratory in Rare Earth Materials and Bioinorganic ChemistryCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China Beijing National Laboratory for molecular Sciences(BNLMS) College of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China Beijing National Laboratory for molecular Sciences(BNLMS) State Key Laboratory for Structural Chemistry of Stable and Unstable SpeciesCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China

The modulation of metal-support interfacial interaction is significant but challenging in the design of high-efficiency and high-stability supported ***,we report a synthetic strategy to upgrade Cu-CeO_(2)interfacial interaction by the pyrolysis of mixed metal-organic framework(MOF)*** obtained highly dispersed Cu/CeO_(2)-MOF catalyst via this strategy was used to catalyze water-gas shift reaction(WGSR),which exhibited high activity of 40.5μmolCOgcat^(-1).s^(-1)at 3.0℃and high stability of about 120 *** on comprehensive studies of electronic structure,pyrolysis strategy has significant effect on enhancing metal-support interaction and then stabilizing interfacial Cu^(+)species under reaction *** Cu^(+)species and generated oxygen vacancies over Cu/CeO_(2)-MOF catalyst played a key role in CO molecule activation and H2O molecule dissociation,*** collaborated closely and then promoted WGSR catalytic performance in comparison with traditio nal supported *** study shall offer a robust approach to harvest highly dispersed catalysts with finely-tuned metal-support interactions for stabilizing the most interfacial active metal species in diverse heterogeneous catalytic reactions.

关键词： Cu-based catalyst MOF derivative Water-gas shift reaction Metal-support interaction

Coupling of BiOCl Ultrathin Nanosheets with Carbon Quantum Dots for Enhanced Photocatalytic Performance

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Transactions of Tianjin university 2024年第3期30卷 211-220页

作者： Pin Song xiaoyu Fang wei Jiang Yuyang cao Daobin Liu Shiqiang wei Jun Du Lang Sun Lei Zhao Song Liu Yuzhu Zhou Jun Di Chade Lv Bijun Tang Jiefu Yang Tingting Kong Yujie Xiong Key Laboratory of Functional molecular Solids Ministry of EducationAnhui Engineering Research Center of Carbon NeutralityCollege of Chemistry and Materials ScienceAnhui Normal UniversityWuhu 241000China National Synchrotron Radiation Laboratory CAS Center for Excellence in NanoscienceSchool of Chemistry and Materials ScienceUniversity of Science and Technology of ChinaHefei 230029China School of chemistry and Chemical engineering National Special Superfi ne Powder Engineering Research CenterNanjing University of Science and TechnologyNanjing 210094China MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001China School of Materials Science&engineering Nanyang Technological UniversitySingapore 639798Singapore

Over the past few decades,photocatalysis technology has received extensive attention because of its potential to mitigate or solve energy and environmental pollution *** novel materials with outstanding photocatalytic activities has become a research hotspot in this *** this study,we prepared a series of photocatalysts in which BiOCl nanosheets were modified with carbon quantum dots(CQDs)to form CQDs/BiOCl composites by using a simple solvothermal *** photocatalytic performance of the resulting CQDs/BiOCl composite photocatalysts was assessed by rhodamine B and tetracycline degradation under visible-light *** with bare BiOCl,the photocatalytic activity of the CQDs/BiOCl composites was significantly enhanced,and the 5 wt%CQDs/BiOCl composite exhibited the highest photocatalytic activity with a degradation efficiency of 94.5%after 3. min of ***,photocatalytic N_(2)reduction performance was significantly improved after introducing *** 5 wt%CQDs/BiOCl composite displayed the highest photocatalytic N_(2)reduction performance to yield NH_3.3.6.25μmol/(g h)),which is significantly higher than those of 3.wt%CQDs/BiOCl(256.04μmol/(g h)),7 wt%CQDs/BiOCl(254.07μmol/(g h)),and bare BiOCl(240.19μmol/(g h)).Our systematic characterizations revealed that the key role of CQDs in improving photocatalytic performance is due to their increased light harvesting capacity,remarkable electron transfer ability,and higher photocatalytic activity sites.

关键词： Carbon quantum dots BiOCl Rhodamine B Tetracycline Photocatalysis