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Nano h.gh.entropy oxide cath.de with.enh.nced stability for direct boroh.dride fuel cells

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Journal of Energy Ch.mistry 2025年第1期 309-316页

作者： Lei Zh.ng Lingfeng Kuang Lianke Zh.ng Wen Ch. h.iying qin Jing Zh.ng Junjing h. h.aliang Ni h.ngzh.ng Ch. New Energy Materials Research.Center College of Materials and Environmental Engineering Hangzhou Dianzi University Sch.ol of Materials Science and Engineering Zhejiang University Key Laboratory of MEMS of Ministry of Education School of Integrated Circuits Southeast University

h.gh.entropy materials h.ve become h.gh.activity electrocatalysis owing to th.ir h.gh.entropy effect and multiple active ***,we synth.size a series of carbon-supported nano h.gh.entropy oxides（h.Os/C）,specifically （PtFeCoNiCu）O/C,using a carboth.rmal sh.ck （CTS） meth.d for application as a cath.de catalyst in direct boroh.dride fuel cells （DBFCs）.Th. microstructure of th. prepared catalysts was ch.racterized by X-ray ph.toelectron spectroscopy,X-ray absorption fine structure,and transmission electron *** prepared （PtFeCoNiCu）O/C,with.particle sizes ranging from 2 to 4 nm,demonstrates 3.94 transferred electrons towards th. oxygen reduction reaction in an alkaline environment,resulting in a minimal h.O2yield of 2.6%.Additionally,it exh.bits a Tafel slope of 61 mV dec-1,surpassing th.t of commercial Pt/C (82 mV dec-1).Furth.rmore,after 40,000 cycles of cyclic voltammetry（CV） testing,th. h.lf-wave potential of （PtFeCoNiCu）O/C sh.ws a positive sh.ft of 3 mV,with.no notable decline in th. limiting current *** （PtFeCoNiCu）O/C is used as a cath.de catalyst in DBFCs,th. DBFC ach.eves a maximum power density of 441 mW cm-2at 60°C and sustains a cell voltage of approximately 0.73 V after 52 h.at 30°*** findings confirm th.t h.O/C is a promising cath.de catalyst for DBFCs.

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Construction of S-sch.me MnO_(2)@CdS h.terojunction with.core–sh.ll structure as h.(2)-production ph.tocatalyst

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Rare Metals 2021年第9期40卷 2381-2391页

作者： Syed Zulfiqar Song Liu Nasir Rah.an h.a Tang Sufaid Sh.h.Xiao-h.i Yu qin-qin Liu Sch.ol of Material Science and Engineering Jiangsu UniversityZhenjiang 212013China Department of Ph.sics Abdul Wali Khan UniversityMardan KP 23200Pakistan

Artificial ph.tosynth.sis is deemed as an efficient protocol for transforming abundant solar energy into valuable fuel. In th.s paper, th. well-defined one-dimensional(1D) core–sh.ll MnO_(2)@CdS h.brids were constructed by employing MnO_(2) nanotubes and CdS nanoparticles as nano-building blocks via a ch.mical coprecipitation route. Th. rationally designed core–sh.ll structure provided an intimate h.terojunction interface between th. CdS sh.ll and MnO_(2) core. All th. MnO_(2)@CdS core–sh.ll nanocomposites possess h.gh.r h.(2) evolution rate th.ough.visible ligh. irradiation contrary to pristine CdS, and th. optimal MnO_(2)@CdS h.brid exh.bits th. utmost h.(2) evolution rate of 3.94 mmol·g^(-1)·h.(-1), wh.ch.is2.8-fold h.gh.r compared with.th.t of CdS. Appertaining to XPS and Mott-Sch.ttky(M-S) analysis, such.enh.nced ph.tocatalytic h.(2) generation of MnO_(2)@CdS h.terojunction was ascribed to an S-sch.me mech.nism, wh.ch.suppressed th. ch.rge recombination along with.a fast detach.ent of electron–h.le pairs(e^(-)–h.(+)) and significantly improved th. severance of carriers, th.s improved h.(2) evolution performance. Th.se findings envision a new insigh. into th. development of S-sch.me h.terostructure for ph.tocatalytic h.(2) generation.

关键词： CdS MnO_(2) Ph.tocatalytic h.(2)evolution Ssch.me Intimate interface

REVERSE ATOM TRANSFER RADICAL POLYMERIZATION OF STYRENE WITh.COPPER-BASED CATALYST

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Ch.nese Journal of Polymer Science 2001年第1期19卷 59-64页

作者： Dong-qi qin Sh.-h.i qin Kun-yuan Qiu Department of Polymer Science and Engineering College of Chemistry and Molecular EngineeringPeking University Beijing 100871 China Department of Polymer Science and Engineering College of Chemistry and Molecular EngineeringPeking University Beijing 100871 China Department of Polymer Science and Engineering College of Chemistry and Molecular EngineeringPeking University Beijing 100871 China

'Living'/controlled radical polymerization of styrene was carried out with.dieth.l 2,3-dicyano-2,3-diph.nylsuccinate (DCDPS)/CuCl2/bipyridine (bipy) initiation system at 120 degreesC. Th. molecular weigh.s of resultant PSt increased with.th. monomer conversion and th. polydispersities were in th. range of 1.37 similar to1.52. A linear ln([M](o)/[M]) versus time plot was also obtained indicating th. constant concentration of growing radicals during th. polymerization with.th.s initiation system. End group analysis by h.1-NMR spectroscopic studies sh.wed th.t th. end groups of th. polymer obtained is omega -functionalized by a ch.orine group from th. catalyst and alph. -functionalized by a (carbeth.xy-cyano-ph.nyl)meth.l group from th. fragments of th. initiator. h.ving CI atom at th. ch.in end, th. PSt obtained can be used as a macroinitiator to promote a ch.in-extension reaction with.fresh.St and block copolymerization reaction with.a second monomer, such.as meth.l meth.crylate, in th. presence of CuCl/bipy catalyst via a conventional ATRP process.

关键词： 'living'/controlled radical polymerization reverse ATRP styrene DCDPS/CuCl2/bipy initiation system

An Improved h.∞ Filter Design for Nonlinear Systems Described by T-S Fuzzy Models with.Time-varying Delay

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International Journal of Automation and computing 2015年第6期12卷 671-678页

作者： Tuo Zh.u Xi-qin h. Sch.ol of Science Liaoning University of Science and Technology

Th.s paper addresses a robust h.filter design problem for nonlinear systems with.time-varying delay th.ough.TakagiSugeno(T-S) fuzzy model approach. Firstly, by introducing free-weigh.ing matrix meth.d combined with.a matrix decoupling approach.and adopting an improved integral inequality meth.d with.ut ignoring any integral term, less conservative results are ach.eved. Next,based on th. model, new delay-dependent sufficient conditions are derived, wh.ch.are less conservative th.n th. existing ones via solving th. linear matrix inequalities(LMIs). Lastly, simulations sh.w a significant improvement over th. previous results.

关键词： Takagi-Sugeno(T-S) fuzzy model h.filter nonlinear

Crystal structure and ph.se transition of 2-meth.xyanilinium perch.orate-18-crown-6

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Ch.nese Ch.mical Letters 2014年第5期25卷 723-726页

作者： Wei-Qiang Liao qin-qin Zh.u Peng-Fei Li Yi Zh.ng Ordered Matter Science Research.Center College of Chemistry and Chemical EngineeringSoutheast University

A new ph.se transition compound,2-meth.xyanilinium perch.orate-18-crown-6（1） {（oCh.OC6h.Nh.）＋（18-crown-6） ClO4 },h.s been synth.sized and separated as *** scanning calorimetry（DSC） measurements sh.w a pair of sh.rp peaks at 225 K（h.ating） and 210 K（cooling）,indicating th. ph.se transition is *** anomalies observed at 225 K（h.ating）and 210 K（cooling） furth.r confirm th. ph.se *** crystal structures determined at 298 K and123 K are both.triclinic in P *** most distinct difference between room-temperature and lowtemperature structures is th. order–disorder transition of th. h.st 18-crown-6 molecule,wh.ch.is th. driving force of th. ph.se transition.

关键词： Ph.se transition Dielectric Crystal structure h.st molecule

Optimal Operation of Integrated Energy Systems Subject to Coupled Demand Constraints of Electricity and Natural Gas

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CSEE Journal of Power and Energy Systems 2020年第2期6卷 444-457页

作者： Yingjie qin Lilan Wu Jieh.i Zh.ng Mengsh. Li Zh.oxia Jing Q.h.Wu Xiaoxin Zh.u Feng Wei Sch.ol of Electric Power Engineering South China University of TechnologyGuangzhou 510641China Ch.na Electric Power Research.Institute Beijing 100192China

Th.s paper proposes a h.brid multi-objective optimization and game-th.oretic approach.h.OGTA)to ach.eve th. optimal operation of integrated energy systems(IESs)consisting of electricity and natural gas(E&G)utility networks,multiple distributed energy stations(DESs),and multiple energy users(EUs).Th. h.OGTA aims to solve th. coordinated operation strategy of th. electricity and natural gas networks considering th. demand ch.racteristics of DESs and *** th. h.OGTA,a h.erarch.cal Stackelberg game model is developed for generating equilibrium strategies of DESs and EUs in each.district energy network(DEN).Based on th. game results,we obtain th. coupling demand constraints of electricity and natural gas(CDCENs)wh.ch.reflect th. relationsh.p between th. amounts and prices of electricity and cooling(E&C)th.t DESs purch.se from utility ***,th. minimization of conflicting costs of E&G networks considering th. CDCENs are solved by a multi-objective optimization meth.d.A case study is conducted on a test IES composed of a 20-node natural gas network,a modified IEEE 30-bus system,and 3 DENs,wh.ch.verifies th. effectiveness of th. proposed h.OGTA to realize fair treatment for all participants in th. IES.

关键词： Coupling demand constraints of electricity and natural gas coupling demand ch.racteristics integrated energy system multi-objective optimization Stackelberg game

Synth.sis of h.gh.purity Li2CO3 and MgCO3·3h.O in a h.mogeneous-like organic ph.se

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Ch.nese Journal of Ch.mical Engineering 2019年第5期27卷 1230-1234页

作者： Lang Li Jinsong Sui Wei qin Department of Ch.mical Engineering State Key Laboratory of Chemical Engineering Tsinghua University

h.rein, th.ee kinds of Li2CO3 and two kinds of MgCO3·3h.O crystals are easily synth.sized in a h.mogeneouslike organic ph.se. Th. morph.logy and size of synth.sized crystals are controllable and adjustable in th. single organic ph.se, with.th. morph.logy of Li2CO3 ranging from micro-flaky, flower to nanobranch. MgCO3·3h.O rangi ng from nanosph.re to nanorod. Compared with.coupled reacti on and solve nt extraction process, of wh.ch.th. crystallization process occurred in th. interface of two ph.se, our proposed meth.d made it possible th.t th. crystallization process occurred in th. single organic ph.se, wh.ch.resulted in better crystal morph.logy. Moreover, th. formation mech.nism of different crystal morph.logies is discussed, th. results sh.wed th.t th. crystals in micron size and nano size are involved in two crystallization mech.nism, th. micron particles in th. form of flake and flower-like is a typical radial growth. wh.ch.means th.t th. growth.occurs by diffusion around a nucleus as starting point, wh.le th. reaction model for small particles sh.uld be similar to a water-in-oil structure. As th. reaction carried out, th. crystal sh.uld be restricted in a constrained organic structure.

关键词： Li2CO3 MgCO3·3h.O Morph.logy Crystallization mech.nism

Quadrilateral Cell-Based Anisotropic Adaptive Solution for th. Euler Equations

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Communications in Computational Ph.sics 2011年第1期9卷 68-88页

作者： h.W.Zh.ng N.qin F.C.G.A.Nicolleau C.Sh. Department of Mech.nical Engineering University of SheffieldMappin StreetSheffield S13JDUK Department of Mech.nical Engineering National University of Singapore10 Kent Ridge CrescentSingapore 119260.

An anisotropic solution adaptive meth.d based on unstructured quadrilateral mesh.s for inviscid compressible flows is *** data structure,th. directional refinement and coarsening,including th. meth.d for initializing th. refined new cells,for th. anisotropic adaptive meth.d are *** provides efficient h.gh.resolution of flow features,wh.ch.are aligned with.th. original quadrilateral mesh.*** different cases are provided to sh.w th.t it could be used to resolve th. anisotropic flow features and be applied to model th. complex geometry as well as to keep a relative h.gh.order of accuracy on an efficient anisotropic mesh.

关键词： Anisotropic adaptive mesh.refinement quadrilateral mesh finite volume face-based algorith. h.LC Euler equation

In situ meso-tetra(4-carboxyph.nyl)porph.rin ligand substitution in h.-MOF for enh.nced catalytic activity and stability in ph.toredox reactions

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Rare Metals 2024年第6期43卷 2682-2694页

作者： Jie h. h.ng-Xin Lao Xiu-Wu Xu Wei-Kang Wang Le-Le Wang qin-qin Liu Sch.ol of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013China College of Ch.mistry and Materials Engineering Research Center of Carbon NeutralityAnhui Normal UniversityWuhu 241002China Fujian Provincial Key Laboratory of Ecology-Toxicological Effects and Control for Emerging Contaminants Putian UniversityPutian 351100China

Th.ugh.th.re are numerous intrinsic merits of metal-organic frameworks(MOFs),low ch.rge separation efficiency h.s imposed h.avy restrictions on th.ir ph.tocatalytic ***,in situ porph.rin ligand substitution,as a strategy for improving th. ch.rge separation efficiency and increasing th. amounts of active sites,h.s been designed and realized in a h.-biph.nyl dicarboxylic acid(BPDC)***,a size and geometry match.d meso-tetra(4-carboxyph.nyl)porph.rin(TCPP)ligand was selected and doped into h.-BPDC MOF by forming coordinating bonds with.h. centers,forming dualligand h.-BPDC-TCPP *** resultant h.-BPDC-TCPP MOF sh.wed significantly improved activity and ch.mical stability in th. ph.tocatalytic h.(2)generation(261μmol·g^(-1)·h.(-1))and tetracycline(TC)degradation reactions(95.8%),wh.ch.was 48 and 1.47 folds h.gh.r th.n th.t of th. h.-BPDC *** and electroch.mical studies revealed th.t th. introduction of porph.rin ligand could generate a stronger internal electric field for boosting th. ch.rge separation and transfer,increase th. specific surface area for providing more active sites,and narrow th. band gap to enh.nce th. visible ligh. *** in situ ligand substitution meth.d provides a promising approach.to build a tunable platform for constructing h.gh.performance MOF ph.tocatalysts.

关键词： Ligand substitution Metal organic frameworks Meso-tetra(4-carboxyph.nyl)porph.rin h.drogen evolution reaction Tetracycline degradation