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Influence of Freezing Layer on the Crystallization Kinetics of PCL on Oriented PE Film

Chinese Journal of Polymer Science 2023年第5期41卷 778-786,I0010页

作者： Hao Zhang Ying-Xiao Song Na Li Shao-Juan Wang Jian Hu Rui Xin Jie Zhang Chun-Feng Song Shou-Ke Yan Key Laboratory of Rubber-Plastics Ministry of Education/Shandong Provincial Key Laboratory of Rubber-PlasticsQingdao University of Science&TechnologyQingdao 266042China State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing 100029China

The effect of freezing layer on the crystallization kinetics of poly(ε-caprolactone)(PCL)thin and ultrathin films was investigated by monitor the growth process of it on oriented polyethylene(PE)and CaF_(2)with and without freezing layer,*** was found that the PCL films with similar thicknesses crystallize much faster on oriented PE than on CaF_(2)*** example,the crystallization rate constant of a 102 nm thick PCL film decreases tremendously by 3 orders of magnitude from 1.1×10^(-1) on PE substrate at 50℃to 7×10^(-4)on CaF_(2)surface at 40℃.Moreover,the crystallization of PCL accelerates on CaF_(2)surface while slows down at PE surface with increasing film *** ultrathin films of PCL with thickness less than 14 nm exhibits the fastest crystallization rate on oriented PE with a rate constant of about 3.5×10^(-1),which is 3 times higher than that of a ca.50 nm thick *** illustrates the great influence of freezing layer on the crystallization process of *** freezing layer thickness of PCL on PE is estimated to be in the range of 14-17 *** the radius of gyration(R_(g)~15.6 nm)of the used PCL material into account,the obtained results may imply the existence of a correlation between the R_(g)of PCL and its freezing layer thickness at PE substrate.

关键词： Poly(ε-caprolactone) Polyethylene Interface Freezing layer Crystallization kinetics

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Lattice-matched metal/WN catalyst with highly oxygenophilic W sites for hydrogen production in seawater electrolyzer

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Journal of Energy Chemistry 2025年第6期105卷 302-311页

作者： Shipeng Geng Liming Chen Yinlong Wu Yi Wang Shuqin Song The Key Lab of Low-Carbon Chemistry & Energy Conservation of Guangdong Province PCFM Lab School of Materials Science and Engineering School of Chemical Engineering and Technology Sun Yat-sen University School of Materials Science and Engineering Hebei University of Science and Technology

Designing efficient and durable hydrogen evolution reaction（HER） catalysts for seawater electrolysis is crucial for large-scale hydrogen ***,we introduce a theory-driven design of metal/WN electrocatalysts,with metal strongly coupled to lattice-matched *** calculations for Pt/WN reveal that W sites enhance H2O adsorption/dissociation,optimizing Pt's H *** prepared Pt/WN@CP nanorods can catalyze HER with low overpotentials of 107 and 113 mV at 500 mA cm-2in alkaline water/seawater,respectively,surpassing Pt/*** calculations and experiments show that the optimized Ni/WN@CP-90 achieves an optimal ΔGH*and overpotential of 219 mV at 500 mA cm-2in alkaline seawater,demonstrating the versatility of the WN support to promote HER ***,the anion exchange membrane water electrolyzer（AEMWE） constructed by Pt/WN@CP or Ni/WN@CP-90 with NiFe-LDH@NF demonstrates outstanding hydrogen production activity with excellent Faraday efficiency（～100%） and durability（120 h）,indicating the potential application of WN-supported catalysts for efficient and stable seawater electrolysis.

关键词： Anion exchange membrane water electrolyzer Density functional theory Hydrogen evolution reaction Seawater electrolysis WN support

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A theoretical insight about co-pyrolysis reaction of natural gas and coal

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Chinese Journal of chemical engineering 2023年第11期63卷 220-225页

作者： Mingjun Pan Chengkai Jin Bingying Han Runping Ye Rongbin Zhang Gang Feng School of Future Technology School of Chemistry and Chemical EngineeringInstitute of Applied ChemistryNanchang UniversityNanchang 330031China School of Chemistry and Chemical Engineering Nanchang UniversityNanchang 330031China State Key Laboratory of Clean and Efficient Coal Utilization Taiyuan University of TechnologyTaiyuan 030024China

The co-pyrolysis of natural gas and coal is a promising way for the production of acetylene due to its high efficiency for energy and hydrogen *** work investigated the thermodynamics for the copyrolysis reaction of natural gas and coal using density functional *** favorable reaction conditions are presented in the form of phase *** calculation results show that the extra amount of methane may benefit the production of acetylene in the co-pyrolysis reaction,and the C/H ratio of 1:1,temperature around 3000 K and pressure at 0.1 MPa are most *** results would provide basic data for related industrial process for the production of acetylene.

关键词： Natural gas Thermodynamics Hydrocarbons Co-pyrolysis Gibbs free energy Density functional theory

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Continuous synthesis of N,N-dicyanoethylaniline in microreactors:Reaction kinetics and process intensification

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Chinese Journal of chemical engineering 2024年第8期72卷 95-105页

作者： Pengcheng Lu Yaoyao Li Jianjun Zhang Yuchao Zhao Qingqiang Wang Ying Chen Nan Jin Xiugang Yu Shandong Provincial Key Laboratory of Chemical Engineering and Process College of Chemistry and Chemical EngineeringYantai UniversityYantai 264005China Shandong ANOKY Chemical Technology Research Co. Ltd.Yantai 265601China Yantai Guobang Chemical Machinery Technology Co. Ltd.Yantai 264000China

Cyanoethylation of phenylamine is one of the important steps for the production of dicyanoethyl-based disperse ***,the exothermic nature of this reaction and the inherent instability of intermittent dynamic operation pose challenges in achieving both high safety and reaction *** this study,a continuous cyanoethylation of phenylamine for synthesizing N,N-dicyanoethylaniline in a microreactor system has been *** optimizing the reaction conditions,the reaction time was significantly reduced from over 2 h in batch operation to approximately 14 min in the microreactor,while high conversion and selectivity were *** on the reaction network constructed,the reaction kinetics was established,and the kinetic parameters were then *** findings provide valuable insights into a controllable cyanoethylation reaction,which would be helpful for the design of efficient processes and optimization of reactors.

关键词： Cyanoethylation Microreactor Kinetics N,N-dicyanoethylaniline Optimization Safety

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Carbon-based nanoarrays embedded with Ce-doped ultrasmall Co_(2)P nanoparticles enable efficient electrooxidation of 5-hydroxymethylfurfural coupled with hydrogen production

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Science China Chemistry 2023年第7期66卷 2141-2152页

作者： Shangfang Xie Hongchuan Fu Liyu Chen Yingwei Li Kui Shen Guangdong Provincial Key Laboratory of Fuel Cell Technology School of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhou 510640China

The electrooxidation of 5-hydroxymethylfurfural(HMFOR)not only offers a green route to attain high-value 2,5-furandicarboxylic acid(FDCA)from biomass,but also is considered as a promising approach to replace the kinetically sluggish OER for future hydrogen ***,we report the construction and structural optimization of Ce-doped ultrasmall Co_(2)P nanoparticles(NPs)in carbon-based nanoarrays to boost HER-coupled *** demonstrate that the electronic structure of Co-based electrocatalysts can be positively regulated by Ce doping and the optimized Ce-Co_(2)P-based electrocatalyst only require a low voltage of 1.20 V *** to achieve 10 m A cm^(-2)for HMFOR with an excellent FDCA Faraday efficiency(FEFDCA)of 98.5%,which are superior to its Ce-free counterpart(1.29 V ***;FEFDCA=83.9%).When being assembled into a HERcoupled HMFOR system,this bifunctional electrocatalyst can achieve 50 m A cm^(-2)with an ultralow voltage of 1.46 V,which is reduced by 210 m Vas compared with that of its Ce-free counterpart(1.67 V).Quasi-operando experiments and DFTcalculations further reveal the significant roles of Ce doping in promoting the charge transfer between active sites and HMF,and reducing the free energy barrier of intermediate(^(*)HMFCA)*** study provides new insights into the underlying mechanisms of Ce doping into metal phosphides for boosting HER-coupled HMFOR,developing a facile methodology to construct efficient electrocatalysts for energy storage/conversion systems.

关键词： ultrasmall Co_(2)P nanoparticles Ce doping nanosheet arrays 5-hydroxymethylfurfural electrooxidation hydrogen evolution reaction

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Shaping the future of fiber technology: exploring functional and smart innovations

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National Science Review 2024年第10期11卷 7-8页

作者： Meifang Zhu State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua University NSR

On 14 February 1928, American chemist Dr. Wallace Hume Carothers wrote a letter to Dr. John R. Johnson at Cornell University, in which he articulated, for the first time, his deep insights into polymerization and polymeric molecules [1]. These pioneering ideas directly led to the invention and commercialization of nylon by Du Pont in the 1930s, marking the dawn of the chemical fiber era. Over nearly 100 years of development,chemical fibers have evolved from a singular category into a diverse range of materials utilized in fields spanning clothing and home textiles to aerospace and electronic devices [2].

关键词： technology future smart fiber exploring functional innovations shaping

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Red mud-based catalysts for the catalytic removal of typical air pollutants: A review

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Journal of Environmental Sciences 2023年第5期127卷 628-640页

作者： Jiawei Chen YaoWang Zhiming Liu State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing 100029China Beijing Center for Environmental Pollution Control and Resource Recovery Beijing University of Chemical TechnologyBeijing 100029China Beijing Key Laboratory of Energy Environmental Catalysis Beijing University of Chemical TechnologyBeijing 100029China

Red mud,as a solid waste produced during the alumina production,can cause severe ecoenvironmental pollution and health risks to ***,the resourcing of this type of solid waste is an effective way for the sustainable *** paper reviews the recent progress on red mud-based catalysts for the removal of typical air pollutants,such as the catalytic reduction of nitrogen oxides(NO_(x))by NH_(3)(NH_(3)-SCR)and the catalytic oxidation of CO and volatile organic compounds(VOCs).The factors influencing the catalytic performance and the structure–activity relationship have been *** prospects and directions for the development of such catalysts are also *** review would benefit for the high value-added utilizations of red mud in mitigating atmospheric pollutions.

关键词： Red mud Catalyst NH_(3)-SCR Catalytic oxidation Air pollutants

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Facilitating efficient photocatalytic hydrogen evolution via enhanced carrier migration at MOF-on-MOF S-scheme heterojunction interfaces through a graphdiyne(C_(n)H_(2n-2))electron transport layer

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Chinese Journal of Structural Chemistry 2023年第12期42卷 11-23页

作者： Fei Jin Bolin Yang Xuanpu Wang Teng Li Noritatsu Tsubaki Zhiliang Jin School of Chemistry and Chemical Engineering Ningxia Key Laboratory of Solar Chemical Conversion TechnologyKey Laboratory for Chemical Engineering and TechnologyState Ethnic Affairs CommissionNorth Minzu UniversityYinchuan750021PR China Department of Applied Chemistry Graduate School of EngineeringUniversity of ToyamaGofuku3190Toyama930-8555Japan

Interface engineering of photocatalysts is an effective way to enhance their photocatalytic *** this work,the MOF-on-MOF strategy was used to construct the ZIF-9(Co)/Cu_(3)BTC_(2) photocatalyst in ***,graph-diyne,possessing an inherent capability to facilitate rapid electron transfer at the interface,has been introduced into the ZIF-9(Co)/Cu_(3)BTC_(2) interface to regulate the interfacial carrier *** photogenerated carrier transfer capability has been significantly enhanced by the interfacial synergy,while retaining the original active sites and high specific surface *** exceptional efficiency performance of the composite catalyst under identical conditions could be attributed to the following two key factors:(i)The interfacial S-scheme hetero-junction in ZIF-9(Co)/Cu_(3)BTC_(2) provides the composite catalyst with strong reduction activity,facilitating the involvement of additional electrons in the reduction reaction through bended bands and an internal electric field.(ii)Carrier dynamics analysis shows that graphdiyne,as an electron transport layer,accelerates the charge migration rate at the S-scheme heterojunction interface through the electron relay *** incorporation of graphdiyne greatly improves the catalytic activity of MOFs and also demonstrates the great potential of graph-diyne in *** work provides a feasible idea for the interface engineering design of graphdiyne in photocatalysts.

关键词： Graphdiyne S-scheme heterojunction MOFs Photocatalytic hydrogen evolution

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Sustainable ammonia synthesis: Opportunities for electrocatalytic nitrate reduction

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Journal of Energy Chemistry 2025年第6期105卷 630-668页

作者： Haoxuan Jiang Tianyu Li Yuting Gao Jieping Fan Dingwei Gan Shuai Yuan Longfei Hong Yue Feng Jing Sun Qiang Song Tianqi Zhang Ali Rouhzollah Jalili Patrick J.Cullen Renwu Zhou State Key Laboratory of Electrical Insulation and Power Equipment Centre for Plasma Biomedicine School of Electrical Engineering Xi'an Jiaotong University Chemical and Biomolecular Engineering The University of Sydney School of Chemistry University of New South Wales (UNSW) Sydney

Ammonia is the cornerstone of modern agriculture,providing a critical nitrogen source for global food production and serving as a key raw material for numerous industrial *** nitrate reduction,as an environmentally friendly method for synthesizing ammonia,not only mitigates the reliance on current ammonia synthesis processes fed by traditional fossil fuels but also effectively reduces nitrate pollution resulting from agricultural and industrial *** review explores the fundamental principles of electrocata lytic nitrate reduction,focusing on the key steps of electron transfer and ammonia ***,it summarizes the critical factors influencing the performance and selectivity of the reaction,including the properties of the electrolyte,operating voltage,electrode materials,and design of the electrolytic *** discussion of recent advances in electrocatalysts,including pure metal catalysts,metal oxide catalysts,non-metallic catalysts,and composite catalysts,highlights their significant roles in enhancing both the efficiency and selectivity of electrocata lytic nitrate to ammonia(NRA) *** challenges for the industrial NRA trials and further outlooks are outlined to propel this strategy toward real-world ***,the review provides an in-depth overview and comprehensive understanding of electrocata lytic NRA technology,thereby promoting further advancements and innovations in this domain.

关键词： Ammonia synthesis Electrocatalysts Influencing factors Mechanisms Nitrate reduction reaction

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Apically guiding electron/mass transfer reaction induced by Ag/FeN_(x)Mott-Schottky effect within a hollow star reactor toward high performance zinc-air batteries

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Journal of Energy Chemistry 2024年第8期95卷 106-116,I0004页

作者： Kaixiang Shi Kaixin Wang Tong Li Junhao Li Jie Ren Xu Li Yonggang Min Zhouguang Lu Wei Tan Quanbing Liu Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center(Rongjiang Laboratory) Guangdong University of TechnologyJieyang 515200GuangdongChina Guangzhou Key Laboratory of Clean Transportation Energy Chemistry Guangdong Provincial Key Laboratory of Plant Resources BiorefinerySchool of Chemical Engineering and Light IndustryGuangdong University of TechnologyGuangzhou 510006GuangdongChina Key Laboratory of Electrochemical Energy Storage and Energy Conversion of Hainan Province School of Chemistry and Chemical EngineeringHainan Normal UniversityHaikou 571158HainanChina School of Materials and Energy Guangdong University of TechnologyGuangzhou 510006GuangdongChina Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055GuangdongChina

The disparity in the transfer of carriers(electrons/mass)during the reaction in zinc-air batteries(ZABs)results in sluggish kinetics of the oxygen reduction reaction(ORR)and oxygen evolution reaction(OER),along with elevated overpotentials,thereby imposing additional constraints on its ***,the pre-design and target-development of inexpensive,high-performance,and long-term stable bifunctional catalysts are urgently *** this work,an apically guiding dual-functional electrocatalyst(Ag-FeN_(x)-N-C)was prepared,in which a hierarchical porous nitrogen-doped carbon with three-dimensional(3D)hollow star-shaped structure is used as a substrate and high-conductivity Ag nanoparticles are coupled with iron nitride(FeN_(x))*** calculations indicate that the Mott-Schottky heterojunction as an inherent electric field comes from the two-phase bound of Ag and FeN_(x),of which electron accumulation in the FeN_(x)phase region and electron depletion in the Ag phase region promote orientated-guiding charge *** effective modulation of local electronic structures felicitously reforms the d-band electron-group distribution,and intellectually tunes the masstransfer reaction energy barriers for both ORR/***,the hollow star-s haped hierarchical porous structure provides an apical region for fast mass *** results show that the halfwave potential for ORR is 0.914 V,and the overpotential for OER is only 327 mV at 10 mA cm^(-2).A rechargeable ZAB with Ag-FeN_(x)-N-C as the air cathode demonstrates long-term cycling performance exceeding 1500 cycles(500 h),with a power density of 180 mW cm^(-2).Moreover,when employing AgFeN_(x)-N-C as the air cathode,flexible ZABs demonstrate a notable open-circuit voltage of 1.42 V and achieve a maximum power density of 65.6 mW cm^(-2).Ag-FeN_(x)-N-C shows guiding electron/mass transfer route and apical reaction microenvironment for the electrocatalyst architecture in the explo

关键词： Hollow star structure Mott-Schottky effect Apically guiding effect Bifunctional catalysis Zinc-air batteries

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