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Improved length of calcium sulfate crystal seeds and whiskers via ball milling and hydration treatment

Chinese Journal of chemical engineering 2024年第7期71卷 102-109页

作者： Yuke Li Yuxin Liu Jizhen Huang Yi Mei Faculty of Chemical Engineering Kunming University of Science and TechnologyKunming 650500China Yunnan Provincial Key Laboratory of Energy Saving in Phosphorus Chemical Engineering and New Phosphorus Materials Kunming University of Science and TechnologyKunming 650500China

Elucidating the effect of growth periods on the quality of calcium sulfate whiskers(CSWs)prepared from calcium sulfate dihydrate(DH)is ***,crystal seeds and whiskers were prepared from DH in a water–glycerol *** whiskers were obtained from crystal seeds prepared via hydration of DH for 30 s than via ball milling for 5 min followed by hydration for 20 *** attachment of cetyltrimethyl ammonium bromide and glycerol additives to the whisker tops promoted whisker *** whisker sponges exhibited good thermal barrier properties and compression cycle stability.

关键词： Hemihydrate gypsum whisker Hydration Ball milling/hydration Crystal seed Growth process

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Recent advances in heterogeneous hydrosilylation of unsaturated carbon-carbon bonds

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Chinese chemical Letters 2024年第6期35卷 71-85页

作者： Heng Yang Zhijie Zhou Conghui Tang Feng Chen School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002China Key Laboratory of Material Chemistry for Energy Conversion and Storage Ministry of EducationHubei Key Laboratory of Material Chemistry and Service FailureSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074China

The hydrosilylation of unsaturated carbon-carbon bonds is one of the most critical reactions in silicone industrial *** homogeneous Speier's catalyst,Karstedt's catalyst,and other noble metal-based catalysts are widely ***,simplifying the separation of the homogeneous catalyst from reaction products and reducing the high cost of precious metals is still *** review describes the recent development of heterogeneous catalysts for alkene,alkyne,and allene hydrosilylations,which can effectively solve problems in homogeneous hydrosilylation.

关键词： Hydrosilylation Heterogeneous catalysis Alkenes Alkynes Silanes

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Atomically precise M-N-C electrocatalysts for oxygen reduction:Effects of inter-site distance,metal-metal interaction,coordination environment,and spin states

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Journal of Energy Chemistry 2025年第2期101卷 132-155,I0004页

作者： Junfeng Huang Saira Ajmal Anuj Kumar Jianwen Guo Mohammed Mujahid Alam Abdullah G.Al-Sehemi Ghulam Yasin School of Mechanical Engineering Dongguan University of TechnologyDongguan 523808GuangdongChina Nano-Technology Research Laboratory Department of ChemistryGLA UniversityMathuraUttar Pradesh 281406India Department of Chemistry College of ScienceKing Khalid UniversityAbha 61413Saudi Arabia School of Environmental Science and Engineering Tianjin UniversityTianjin 300350China State Key Laboratory of Chemical Resource Engineering College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029China

Inspired by molecular catalysts,researchers developed atomically precise nitrogen-coordinated single or dual metal sites imbedded in graphitized carbon(M-N-C)to fully utilize metallic sites for *** catalysts performed remarkably well in the electrocatalytic oxygen reduction reaction(ORR)due to their distinct coordination and electrical structures,Nonetheless,their maximum efficacy in practical applications has yet to be *** agenda identifies tailoring the coordination environment,spin states,intersite distance,and metal-metal interaction as innovative approaches to regulate the ORR performance of these ***,it is necessary to undertake a precise assessment of these methodologies and the knowledge obtained to be implemented in the design of future M-N-C catalysts for ***,this review aims to analyze recent progress in M-N-C ORR catalysts,emphasizing their innovative engineering with aspects such as alteration in intersite distance,metal-metal interaction,coordination environment,and spin ***,we critically discuss how to logically monitor the atomic structure,local coordination,spin,and electronic states of M-N-C catalysts to modulate their ORR *** have also highlighted the challenges associated with M-N-C catalysts and proposed suggestions for their future design and fabrication.

关键词： Electrocatalysis M-N-C electrocatalysts ORR Activity descriptors Spin states

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Synergistic fibrillization engineering in donor and acceptor phases enables high-performance all-polymer solar cells

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Nano Research 2025年第4期18卷 219-227页

作者： Bin Zhang Yushou Zhao Xiaofeng Qin Aiqin Li Xinling Li Wenming Li Weile Guo Xiaolan Qin Zhicai He Yong Hua Menglan Lv Liming Ding Engineering Research Center for Energy Conversion and Storage Technology of Guizhou School of Chemistry and Chemical EngineeringGuizhou UniversityGuiyang 550025China School of Chemical Engineering and Light Industry Guangdong University of TechnologyGuangzhou 510006China Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of TechnologyGuangzhou 510640China School of Materials and Energy Yunnan UniversityKunming 650091China

Recently,all-polymer solar cells(all-PSCs)have become an important organic photovoltaic technology,ascribing to their unique characteristics of high stability and mechanical ***,the morphology control between polymer donor and polymer acceptor suffers from tough difficulties,resulting from the nature of rigid planarity and chain entanglement in the conjugated polymer *** this work,we utilize an additive,1-chloro-naphthalene(CN),to regulate polymer chain stacking and orientation in D18:PY-IT system,resulting in the formation of versatile nano-scale polymer fibrillization between donor and acceptor ***,the CN-modified D18:PY-IT blend film shows improved molecular stacking characteristics and distinct nano-scale bi-continuous phase *** to the incorporation of CN additive in a bulk-heterojunction(BHJ)D18:PY-IT system,it exhibits higher photovoltaic performance than the as-cast and only thermal annealing(TA)treated devices,where the CN-based device provides a power conversion efficiency(PCE)of 17.31%,an open-circuit voltage(VOC)of 0.955 V,a short-circuit current density(JSC)of 24.16 mA·cm^(-2),and a fill factor(FF)of 74.99%,*** is one of the highest photovoltaic performances reported in the D18:PY-IT based binary BHJ ***,it is evident that the morphology in all-PSCs can be feasibly modulated via incorporating appropriate additive into active layer for achieving excellent photovoltaic performance.

关键词： fibrillization engineering morphology control additive 1-chloro-naphthalene all-polymer solar cells

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Fabrication of anti-fouling polyamide nanofiltration membrane by incorporating streptomycin as a novel co-monomer

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Chinese Journal of chemical engineering 2022年第10期50卷 185-196页

作者： Shujie Guo Jiao Du Fangzheng Yan Zhi Wang Jixiao Wang Chemical Engineering Research Center School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300350China Tianjin Key Laboratory of Membrane Science and Desalination Technology State Key Laboratory of Chemical EngineeringCollaborative Innovation Center of Chemical Science and EngineeringTianjin UniversityTianjin 300350China Haihe Laboratory of Sustainable Chemical Transformations Tianjin 300350China

Polyamide(PA)thin-film composite(TFC)na nofiltration(NF)membrane has extremely broad application prospects in separation of monovalent/diva lent inorganic salts mixed solutio ***,membrane fouling is the main obstacle to the application of PA,TFC and NF ***(SM)is a hydrophilic antibiotic containing a large number of hydroxyl and amino *** this work,the NF membrane was prepared via interfacial polymerization(IP)between trimesoyl chloride(TMC)in the organic phase and SM/piperazine(PIP)mixture in the aqueous *** NF membrane structure and performance were characterized in *** results showed that SM successfully participated in the *** negative charge and hydrophilicity of membrane surface were *** prepared membrane exhibited good anti-adhesion and anti-bacterial performance,Additionally,when the SM concentration was 2%,the prepared membrane exhibited the optimal *** water permeance was 89.4L·m^(-2)·h^(-1)·MPa^(-1).The rejection of NaCl and Na_(2)SO_(4) were 17,17%and 97.84%,*** NaCl/Na_(3)SO_(4) separation factor of the SM2-PIP/TMC membrane in 1000 mg·L^(-1) NaCl and 1000 mg·L^(-1)Na_(2)SO_(4) mixed solution was 40,which was 3.3 times that of PIP/TMC *** indicated that SM2-PIP/TMC demonstrated excellent monovalent/divalent salts separation *** work provided an easy and effective approach to preparing anti-fouling NF membrane while possessing superior monovalent/divalent salts separation performance.

关键词： Streptomycin Polyamide Nanofiltration membrane Anti-adhesion Anti-bacterial

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Carbonized Yolk-shell Metal-Organic Frameworks for Electrochemical Conversion of CO_(2) into Ethylene

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chemical Research in Chinese Universities 2023年第2期39卷 246-252页

作者： WANG Renquan LI Tiantian GAO Rui QIN Jiaqi LI Mengyao GUO Yizheng SONG Yujiang State Key Laboratory of Fine Chemicals School of Chemical EngineeringDalian University of TechnologyDalian116024P.R.China

With the excessive consumption of fossil fuels and the massive emission of CO_(2),it has led to a series of environmental crises posing a serious threat to sustainable *** CO_(2) reduction reaction( CO_(2)RR)to ethylene helps solve these serious environmental ***,we report the synthesis of a copper-based electrocatalyst by pyrolysis of yolk-shell structured HKUST-1 with partial substitution of trimesic acid by benzimidazole(nitrogen source).The electrocatalyst exhibits an ethylene Faradic efficiency(FE)of 25.8%and a partial ethylene current density of 23.7 mA/cm^(2),in addition,the electrocatalyst can maintain stable performance during 10 h of electrolysis,which are all better than those of the electrocatalyst without nitrogen *** to electrochemical measurements and X-ray photoelectron spectroscopy(XPS),we propose that the nitrogen dopant plays an effective role in stabilizing Cu(I)species and promoting CO_(2) molecules activation,as well as suppressing the reduction of Cu(I)species during ***,the performance of the electrocatalyst toward CO_(2)RR is studied in a flow *** work provides a new route for the design of Cu-based electrocatalyst toward electrochemical CO_(2) conversion into ethylene.

关键词： CO_(2) Cu MOF Electrocatalyst Nitrogen Ethylene

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Self-Powered Piezo-Supercapacitors Based on ZnO@Mo-Fe-MnO_(2)Nanoarrays

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Energy & Environmental Materials 2024年第4期7卷 304-314页

作者： Luo Sun Zhiguo Ye Xinyuan Peng Shaojie Zhuang Duosheng Li Zhong Jin School of Materials Science and Engineering Nanchang Hangkong University696#FengHeNan RoadNanchang 330063China State Key Laboratory of Coordination Chemistry MOE Key Laboratory of Mesoscopic ChemistryMOE Key Laboratory of High Performance Polymer Materials and TechnologyJiangsu Key Laboratory of Advanced Organic MaterialsSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China

The development of self-charging supercapacitor power cells(SCSPCs)has profound implications for smart electronic devices used in different ***,we epitaxially electrodeposited Mo-and Fe-codoped MnO_(2)films on piezoelectric ZnO nanoarrays(NAs)grown on the flexible carbon cloth(denoted ZnO@Mo-Fe-MnO_(2)NAs).A self-charging supercapacitor power cell device was assembled with the Mo-and Fe-codoped MnO_(2)nanoarray electrode and poly(vinylidenefluoride-co-trifluoroethylene)(PVDF-Trfe)piezoelectric film doped with BaTiO_(3)(BTO)and carbon nanotubes(CNTs)(denoted PVDF-Trfe/CNTs/BTO).The self-charging supercapacitor power cell device exhibited an energy density of 30μWh cm^(-2)with a high power density of 40 mW cm^(-2)and delivered an excellent self-charging performance of 363 mV(10 N)driven by both the piezoelectric ZnO nanoarrays and the poly(vinylidenefluoride-co-trifluoroethylene)piezoelectric film doped with BaTiO_(3)and carbon *** intriguingly,the device could also be self-charged by 184 mV due to residual stress alone and showed excellent energy conversion efficiency and low self-discharge *** work illustrates for the first time the self-charging mechanism involving electrolyte ion migration driven by both electrodes and films.A comprehensive analysis strongly confirmed the important contribution of the piezoelectric ZnO nanoarrays in the self-charging process of the self-charging supercapacitor power cell *** work provides novel directions and insights for the development of selfcharging supercapacitor power cells.

关键词： MnO_(2) piezoelectric self-charging supercapacitors ZnO nanoarray

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Recent Advances of Electrocatalysts and Electrodes for Direct Formic Acid Fuel Cells:from Nano to Meter Scale Challenges

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Nano-Micro Letters 2025年第6期17卷 482-531页

作者： Yang Li Ming-Shui Yao Yanping He Shangfeng Du School of Chemical Engineering University of BirminghamBirmingham B152TTUK Department of Chemical Engineering Loughborough UniversityLoughboroughLeicestershire LE113TUUK State Key Laboratory of Mesoscience and Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190People’s Republic of China University of the Chinese Academy of Sciences Beijing 100049People’s Republic of China School of Chemical Engineering Kunming University of Science and TechnologyKunming 650504People’s Republic of China

Direct formic acid fuel cells are promising energy devices with advantages of low working temperature and high safety in fuel storage and *** have been expected to be a future power source for portable electronic *** technology has been developed rapidly to overcome the high cost and low power performance that hinder its practical application,which mainly originated from the slow reaction kinetics of the formic acid oxidation and complex mass transfer within the fuel cell ***,we provide a comprehensive review of the progress around this technology,in particular for addressing multiscale challenges from catalytic mechanism understanding at the atomic scale,to catalyst design at the nanoscale,electrode structure at the micro scale and design at the millimeter scale,and finally to device fabrication at the meter *** gap between the highly active electrocatalysts and the poor electrode performance in practical devices is ***,perspectives and opportunities are proposed to potentially bridge this gap for further development of this technology.

关键词： Direct formic acid fuel cell Electrocatalyst Electrode Formic acid oxidation Mass transfer

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Liquid-liquid two-phase flow in a wire-embedded concentric microchannel: Flow pattern and mass transfer performance

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Chinese Journal of chemical engineering 2023年第4期56卷 281-289页

作者： Ming Chen Huiyan Jiao Jun Li Zhibin Wang Feng He Yang Jin Engineering Research Center of Comprehensive Utilization and Clean Processing of Phosphorus Resources School of Chemical EngineeringSichuan UniversityChengdu 610065China The Key Laboratory of Fine Chemical Application Technology of Luzhou Sichuan Vocational College of Chemical TechnologyLuzhou 646300China

In this work, flow pattern and mass transfer of liquid-liquid two-phase flow in a wire-embedded concentric microchannel are studied using toluene-water system. Droplet flow, slug flow, oval flow and annular flow are observed in the wire-embedded concentric microchannel. The effects of embedded wires and physical properties on flow patterns are investigated. The embedded wire insert is conducive to the formation of annular flow. The flow pattern distribution regions are distinguished by the Caaq(capillary number)±We_(org)(Weber number) flow pattern map. When Weorg<0.001, slug flow is the main flow pattern, and when Weorg>0.1, annular flow is the main flow pattern. Oval flow and droplet flow are between We_(org)= 0.001-0.1, and oval flow is transformed into droplet flow with the increase of Caaq. The effect of flow rate, phase ratio, initial acetic acid concentration, insert shape and flow patterns on mass transfers are studied. Mass transfer process is enhanced under annular flow conditions, the volumetric mass transfer coefficient is up to 0.36 s^(-1) because of the high interfacial area and interface renewal rate of annular flow.

关键词： Flow pattern Mass transfer Microchannels Two-phase flow

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High-temperature CO_(2) sorbents with citrate and stearate intercalated Ca-Al hydrotalcite-like as precursor

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Chinese Journal of chemical engineering 2022年第10期50卷 177-184页

作者： Tao Jiang Fei Xiao Yujun Zhao Shengping Wang Xinbin Ma Key Laboratory for Green Chemical Technology School of Chemical Engineering and TechnologyCollaborative Innovation Center of Chemical Science and Engineering(Tianjin)Tianjin UniversityTianjin 300072China

CO_(2),one of the main components of greenhouse gases,increased rapidly because of the growing use of fossil *** CaO sorbents possess the capability to be used in capture of CO_(2) at high *** the work,Ca-Al complex oxides derived from citrate and stearate intercalated layered double hydroxides were fabricated and their CO_(2) adsorption capacity was compared with that from CO_(3)^(2-)intercalated layered double *** results presented that the sorbents(Ca/Al=5)with Ca-Al-citrate layered double hydroxides as precursors performed best and displayed remarkable CO_(2) capture capacity of 52.0%(mass)at the carbonization temperature of 600℃without distinct recession during cycling adsorption/desorption *** excellent CO_(2) adsorption capacity of the sorbent was ascribed to its smaller crystallite size of calcinated particles,optimized pore size distribution as well as homogeneous distributed Ca and Al in the sorbent.

关键词： Layered doublehydroxides CO_(2)capture CaO-based Organic ions

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