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Study on concentration distribution and detonation characteristics for non-axisymmetric fuel dispersal

Defence technology（防务技术） 2024年第1期31卷 484-495页

作者： Linghui Zeng Zhongqi Wang Xing Chen Jianping Li State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081China College of Environment and Chemical Engineering Sichuan University of Science&EngineeringZigong643000China

The study of non-axisymmetric fuel dispersal and detonation can provide reference for the prevention of industrial cloud explosion accidents and the design of fuel air explosive(FAE).The concentration and detonation fields of 85 kg cylindrical and fan-shaped fuel are investigated by experiments and numerical simulations.A dynamic model of the whole process for fuel dispersal and detonation is *** concentration distribution of fuel is used as the initial condition to calculate the detonation stage,thus solving the initial value problem of detonation *** phase and component changes of fuel cloud at different locations are *** fuel cloud is divided into directions of 0°,90°,135°and 180°.The results show that the maximum cloud radius is 20.94 m in 135°and the minimum is 12.04 m in 0°.The diameter of the detonation fireball is 53.6 m,and the peak temperature is 3455 *** highest peak overpressure is 3.44 MPa in 0°and the lowest is 2.97 MPa in 135°.The proportion of liquid phase in 0°is22.90%,and the fuel loss is 11.8% and 9% higher than that in 135°and cylindrical charge,*** stable propagation distance of blast wave in 135°is 42.50% longer than 0°and 28.37% longer than cylindrical charge.

关键词： Fuel dispersal Concentration distribution Detonation characteristic Fuel loss Numerical simulation

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Designing metal-organic framework fiber network reinforced polymer electrolytes to provide continuous ion transport in solid state lithium metal batteries

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Nano Research 2024年第4期17卷 2719-2727页

作者： Wanqing Fan Ying Huang Meng Yu Kaihang She Jingren Gou Zheng Zhang MOE Key Laboratory of Material Physics and Chemistry Under Extraordinary Conditions School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Beijing Key Laboratory of Membrane Materials and Engineering Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

Polyethylene oxide(PEO)-based solid-state electrolytes are considered ideal for electrolyte materials in solid-state lithium metal batteries(SSLMBs).However,practical applications are hindered by the lower conductivity and poor interfacial ***,we propose a strategy to construct a three-dimensional(3D)fiber network of metal-organic frameworks(MOFs).Composite solid electrolytes(CSEs)with continuous ion transport pathways were fabricated by filling a PEO polymer matrix in fibers containing interconnected *** 3D fiber network provides a fast Li+transport path and effectively improves the ionic conductivity(1.36×10^(-4) S·cm^(-1),30℃).In addition,the network of interconnected MOFs not only effectively traps the anions,but also provides sufficient mechanical strength to prevent the growth of Li *** from the advantages of structural design,the CSEs stabilize the Li/electrolyte interface and extend the cycle life of the Li-symmetric cells to 3000 *** assembled SSLMBs exhibit excellent cycling performance at both room and high *** addition,the constructed pouch cells can provide an areal capacity of 0.62 mA·h·cm^(-2),which can still operate under extreme *** work provides a new strategy for the design of CSEs with continuous structure and stable operation of SSLMBs.

关键词： polyethylene oxide(PEO) solid-state lithium metal batteries(SSLMBs) three-dimensional fiber network composite solid electrolytes(CSEs)

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Structural engineering of Fe single-atom oxygen reduction catalyst with high site density and improved mass transfer

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Journal of Energy Chemistry 2024年第11期98卷 634-644页

作者： Jiawen Wu Yuanzhi Zhu An Cai Xiaobin Fan Wenchao Peng Yang Li School of Chemical Engineering and Technology Tianjin UniversityTianjin 300354China Faculty of Chemical Engineering Yunnan Provincial Key Laboratory of Energy Saving in PhosphorusChemical Engineering and New Phosphorus MaterialsKunming University of Science and TechnologyKunming 650500YunnanChina Institute of Shaoxing Tianjin UniversityShaoxing 312300ZhejiangChina

Fe-N-C catalysts are widely considered as promising non-precious-metal candidates for electrocatalytic oxygen reduction reaction(ORR),Yet despite their high catalytic activity through rational modulation,challenges remain in their low site density and unsatisfactory mass transfer ***,we present a structural engineering approach employing a soft-template coating strategy to fabricate a hollow and hierarchically porous N-doped carbon framework anchored with atomically dispersed Fe sites(FeNCh) as an efficient ORR *** combination of hierarchical porosity and high exterior surface area is proven crucial for exposing more active sites,which gives rise to a remarkable ORR performance with a half-wave potential of 0.902 V in 0.1 m KOH and 0.814 V in 0.1 m HClO_(4),significantly outperforming its counterpart with solid structure and dominance of micropores(FeNC-s).The mass transfer property is revealed by in-situ electrochemical impedance spectroscopy(EIS) *** distribution of relaxation time(DRT) analysis is further introduced to deconvolve the kinetic and mass transport processes,which demonstrates an alleviated mass transport resistance for FeNC-h,validating the effectiveness of structural *** work not only provides an effective structural engineering approach but also contributes to the comprehensive mass transfer evaluation on advanced electrocatalyst for energy conversion applications.

关键词： Single-atom catalysts Oxygen reduction reaction Structural engineering Active site density Mass transfer Zinc-air batteries

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Deciphering the role of ultra-low-loaded rhodium in NiFe-MIL-53 for superior oxygen evolution reaction

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Journal of Energy Chemistry 2025年第1期100卷 77-86页

作者： Jinzhi Jia Jinhua Zhang Kailu Guo Lanyue Zhang Gening Du Hao You Junfeng Huang Mudong Tu Hua Li Yong Peng Wei Dou Cailing Xu State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical EngineeringSchool of Materials and EnergyLanzhou UniversityLanzhou 730000GansuChina College of Chemistry and Chemical Engineering Luoyang Normal UniversityLuoyang 471934HenanChina

Designing highly active and stable electrocatalysts of oxygen evolution reaction(OER)is one of the crucial *** this study,a novel OER electrocatalyst,NiFe-MIL-53 modified with ultra-low rhodium(Rh@NiFe-MIL-53),is successfully prepared via the hydrothermal ***-situ Raman spectroscopy and electrochemical impedance spectroscopy reveal that the doped Rh accelerates the phase transformation of NiFe-MIL-53 and the in-situ formed Rh@NiFeOOH is the actual active *** importantly,the enhanced reversibility of electrochemical reconstruction between NiFeOOH and NiFe(OH)_(2)after doping Rh is beneficial for improving the electrochemical stability of the catalyst.X-ray photoelectron spectroscopy spectra show the strong electronic interaction between single-atom Rh and Ni/Fe in Rh@***,theoretical calculations confirm that the integration of single-atom Rh into the NiFeOOH successfully reduces the band gap,regulates the d-band center(εd),accelerates the charge transfer,and optimizes the adsorption behavior of oxygen-containing intermediates,thereby lowering the energy barrier of rate-determining ***,the optimized Rh@NiFe-MIL-53 exhibits excellent OER activity(240 mV)with a small Tafel slope of 48.2 mV dec^(-1)and long-term durability(over1270 h at 10 m A cm^(-2)and 110 h at 200 mA cm^(-2)).This work presents a new perspective on designing highly efficient OER electrocatalysts.

关键词： NiFe-MIL-53 Rh Electrochemical reconstruction Catalytic mechanism Oxygen evolution reaction

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Transforming waste particles into valuable adsorbents via amyloid-mediated molecular engineering

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Science China Chemistry 2025年第1期68卷 317-328页

作者： Qingmin Yang Jian Zhao Yujia Zhang Xingyu Zhou Hao Ren Bowen Hu Zhongli Lei Lixin Chen Peng Yang Key Laboratory of Applied Surface and Colloid Chemistry Ministry of EducationSchool of Chemistry and Chemical EngineeringShaanxi Normal UniversityXi’an 710119China School of Material and Chemical Engineering Bengbu UniversityBengbu 233030China Anhui Provincial Engineering Laboratory of Silicon-Based Materials Bengbu 233030China Xi’an Key Laboratory of Polymeric Soft Matter School of Chemistry and Chemical EngineeringShaanxi Normal UniversityXi’an 710119China International Joint Research Center on Functional Fiber and Soft Smart Textile School of Chemistry and Chemical EngineeringShaanxi Normal UniversityXi’an 710119China School of Chemistry and Chemical Engineering Northwestern Polytechnical UniversityXi’an 710129China

The high-value utilization of industrial solid waste using a facile and eco-friendly process is of great interest and significance in reducing environmental pollution and developing a green circular ***,we propose an amyloid-mediated molecular engineering strategy to transform particulate waste into valuable adsorbents for metal *** method has the advantage of aqueous solution fabrication under mild conditions without the use of high-temperature hydrothermal methods and toxic chemical ***-mediated molecular engineering manipulates the phase transition of bovine serum albumin(BSA)on particulate waste surfaces,resulting in a remarkable~3.1 times improvement in the adsorption capacity of fly ash,a typical industrial solid waste for gold ions after modification with the phase-transitioned BSA(PTB).The resultant adsorption ability was 69–1,980 times higher than those of conventional and emerging adsorbent materials such as ion exchange resins,activated carbon(AC),covalent organic frameworks(COFs),and metal-organic frameworks(MOFs).We further demonstrated the application of our PTB-modified materials in the recovery of precious metals from low-grade gold ore and electronic waste ***,this strategy could increase the value of waste materials nearly 27 *** addition,this method is generally extendable to other conventional industrial adsorbents such as resin,clay,and Al_(2)O_(3),and enhances their adsorption capabilities at least ***,this work provides a simple and green approach for improving the adsorption performance of solid particles,and is expected to develop into a universal strategy for transforming waste particles into high-value-added products.

关键词： amyloid-like protein aggregates surface engineering fly ash solid waste adsorption

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Two-dimensional Cu-porphyrin nanosheet membranes for nanofiltration

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Nano Research 2023年第5期16卷 6290-6297页

作者： Jiahao Cai Shizheng Song Lijie Zhu Qipeng Lu Zong Lu Yanying Wei Haihui Wang School of Chemistry&Chemical Engineering Guangdong Provincial Key Lab of Green Chemical Product TechnologyState Key Laboratory of Pulp and Paper EngineeringSouth China University of TechnologyGuangzhou 510640China School of Instrument Science and Opto-Electronics Engineering Beijing Information Science and Technology UniversityBeijing 100192China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Beijing Key Laboratory for Membrane Materials and Engineering Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

A kind of two-dimensional(2D)metal-organic framework(MOF)material,Cu-meso-tetrakis(4-carboxyphenyl)porphine(Cu-TCPP)nanosheets with wrinkled and flat morphologies are used as building blocks to assemble membranes by vacuum filtration(VF)and electrophoretic deposition(EPD)as energy-efficient nanofiltration(NF)membranes to remove dyes from *** the nanosheets with wrinkled structure can provide additional water transport channels,thereby increasing the water permeance,in the premise of a high rejection(>97.0%)for the dye brilliant blue G(BBG)(1.60 nm×1.90 nm),the water permeance of the membrane assembled by the wrinkled nanosheets(~1170 nm)is about 4 times that of the membrane assembled by the flat nanosheets(~530 nm),reaching 16.39 L·m^(−2)·h^(−1)·bar^(−1).Additionally,the use of the relatively flat nanosheets and the membrane preparation method of electrophoretic deposition is more conducive to stack nanosheets orderly and reduce ***,the water permeance of the membrane prepared by EPD(~1170 nm)with flat nanosheets is about twice that of the membrane prepared by VF(~530 nm),achieving 9.40 L·m^(−2)·h^(−1)·bar^(−1)with similar rejection(>97.0%)of dye evans blue(EB)(3.10 nm×1.20 nm).Furthermore,these membranes still exhibit good separation performance at high pressure of 0.6 *** with diverse structures and various membrane fabrication processes provide new directions for the separation performance optimization of 2D MOF materials for water purification.

关键词： two-dimensional material membrane metal-organic framework(MOF) nanofiltration nanosheet morphology electrophoretic deposition

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Piezoelectric-enhanced n-TiO_(2)/BaTiO_(3)/p-TiO_(2) heterojunction for highly efficient photoelectrocatalysis

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Green Energy & Environment 2024年第9期9卷 1466-1476页

作者： Minhua Ai Zihang Peng Xidi Li Faryal Idrees Xiangwen Zhang Ji-Jun Zou Lun Pan Key Laboratory for Green Chemical Technology of the Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin300072China Collaborative Innovative Center of Chemical Science and Engineering(Tianjin) Tianjin300072China Department of Physics University of the PunjabQuaid-e-Azam CampusLahore54590Pakistan Haihe Laboratory of Sustainable Chemical Transformations Tianjin300192China

Charge separation is critical for achieving efficient solar-to-hydrogen conversion,whereas piezoelectric-enhanced photoelectrochemical(PEC)systems can effectively modulate band bending and charge ***,we design an n-TiO_(2)/Ba TiO_(3)/p-TiO_(2)(TBTm)heterojunction in which the piezoelectric Ba TiO_(3) layer is sandwiched between n-TiO_(2)and p-TiO_(2).The built-in electric field of TBTm can provide a strong driving force to accelerate carrier separation and prolong carrier ***,the TBT3 achieves a prominent photocurrent density,as high as 2.13 m A cm^(-2)at 1.23 V versus reversible hydrogen electrode(RHE),which is 2.4-and 1.5-times higher than TiO_(2) and TiO_(2)–Ba TiO_(3) heterojunction,*** by mechanical deformation,the induced dipole polarization can further regulate built-in electric fields,and the piezoelectric photocurrent density of TBT3-800 is 2.84 times higher than TiO_(2) at 1.23 V *** due to the construction of *** work provides a piezoelectric polarization strategy for modulating the built-in electric field of heterojunction for PEC system.

关键词： Photoelectrochemical Piezoelectric polarization Heterojunction Charge separation

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Superlubricity by polyimide-induced alignment

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Friction 2023年第9期11卷 1690-1707页

作者： Xinlei GAO Hao CHEN Hong YAN Chengrui HUANG Li WU Tingting WANG School of Materials Science and Engineering Hubei UniversityWuhan 430062China School of Chemical and Environmental Engineering Wuhan Polytechnic UniversityWuhan 430023China State Key Laboratory of Chemical Resource Engineering College of ChemistryBeijing University of Chemical TechnologyBeijing 100029China School of Chemistry and Environmental Engineering Wuhan Institute of TechnologyWuhan 430074China

We have investigated the lubrication alignment behavior of point–plane contact and plane–plane contact between the GCr15 steel and polyimide(PI)friction pair using nematic liquid crystals(LCs)as the *** this system,rubbing orients the macromolecular PI molecules,and the oriented PI molecules induce alignment of the LC molecules in contact with or close to the oriented PI *** LC molecules are aligned in the wear scar grooves of the PI film,and alignment extends to the GCr15-steel *** of the LC molecules is correlated with the strong interaction force between the PI and LC molecules,the stable coordination structure of the LCs and GCr15 steel,and the weak interaction between the LC *** performed simulations of the pretilt angle of PI and LCs and discussed the relationship between the pretilt angle and the friction *** to the small pretilt angle between PI and the LCs,the LC molecules orient almost parallel to the PI material,which is beneficial for superlubricity of this type of friction system.

关键词： superlubricity polyimide liquid crystal alignment

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CoSe_(2)supported single Pt site catalysts for hydrogen peroxide generation via two-electron oxygen reduction

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SusMat 2023年第3期3卷 334-344页

作者： Xiao-Dong Zhu Qian Zhang Xiaoxuan Yang Yingnan Wang Jinting Wu Jian Gao Ji-Jun Zou Gang Wu Yong-Chao Zhang State Key Laboratory Base of Eco-Chemical Engineering College of Chemical Engineering Qingdao University of Science&TechnologyQingdaoChina Department of Chemical and Biological Engineering University at BuffaloThe State University of New YorkBuffaloNew YorkUSA Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjinChina

Electrocatalytic oxygen reduction reaction(ORR)to prepare H_(2)O_(2)in acidic medium has the advantages of green,safety,and portability,which shows broad development ***,it still suffers from low catalyst activity,insufficient selectivity,and high ***,Pt_(1)/CoSe_(2)with ultralow 0.01 wt.%Pt atomic distribution was synthesized by a simple hydrothermal *** Pt_(1)/CoSe_(2)with ultralow Pt content exhibits high activity,high selectivity,and long-term stability for ORR to H_(2)O_(2)in O_(2)-saturated 0.1 M HClO_(4).The onset potential is as low as 0.75 V versus reversible hydrogen electrode(RHE),H_(2)O_(2)selectivity is as high as 84%(0.4 V ***),and the electron transfer number is 2.3(0.4 V ***).Moreover,the hydrogen peroxide yield using the flow cell testing is 110.02 mmol g_(cat).^(−1)h^(−1) with high Faradaic efficiency of 78%(0 V ***)at 0.1 M HClO_(4),and the catalyst did not deactivate significantly after 60 h stability *** studies and in situ X-ray photoelectron spectroscopy characterization confirm that the ultralow Pt content on CoSe_(2)can effectively regulate the electronic structure of Co as the real active site around the Pt site,which gives a suitable Δ_(dp) value(the difference between the d-band center of the active metal site and the p-band center of the terminal oxygen in*OOH),provides an ideal*OOH binding energy,and inhibits the O-O bond *** work successfully improves the intrinsic activity of the Co active sites around Pt in Pt_(1)/CoSe_(2)for acidic ORR to H_(2)O_(2)by constructing ultralow-content Pt single atom.

关键词： acidic ORR electrocatalysis hydrogen peroxide Pt_(1)/CoSe_(2) ultralow Pt content

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Rational design of practical layered transition metal oxide cathode materials for sodium-ion batteries

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Frontiers of chemical Science and engineering 2024年第7期18卷 121-140页

作者： Yan Wang Ning Ding Rui Zhang Guanhua Jin Dan Sun Yougen Tang Haiyan Wang Hunan Provincial Key Laboratory of Chemical Power Sources College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083China College of Energy and Chemical Engineering Xinjiang Institute of TechnologyAksu Prefecture 843100China

Sodium-ion batteries (SIBs), which serve as alternatives or supplements to lithium-ion batteries, have been developed rapidly in recent years. Designing advanced high-performance layered NaxTMO_(2) cathode materials is beneficial for accelerating the commercialization of SIBs. Herein, the recent research progress on scalable synthesis methods, challenges on the path to commercialization and practical material design strategies for layered NaxTMO_(2) cathode materials is summarized. Co-precipitation method and solid-phase method are commonly used to synthesize NaxTMO_(2) on mass production and show their own advantages and disadvantages in terms of manufacturing cost, operative difficulty, sample quality and so on. To overcome drawbacks of layered NaxTMO_(2) cathode materials and meet the requirements for practical application, a detailed and deep understanding of development trends of layered NaxTMO_(2) cathode materials is also provided, including high specific energy materials, high-entropy oxides, single crystal materials, wide operation temperature materials and high air stability materials. This work can provide useful guidance in developing practical layered NaxTMO_(2) cathode materials for commercial SIBs.

关键词： sodium-ion batteries layered oxide industrialization development prospect

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