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Correlation between h.dration properties and electroch.mical performances on Ln cation size effect in layered perovskite for protonic ceramic fuel cells

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Journal of Energy Ch.mistry 2024年第1期88卷 1-9,I0001页

作者： Inh.eok Ch. Jiwon Yun Boseok Seong Junseok Kim Sun h.e choi h.-Il Ji Sih.uk choi Department of Mech.nical Engineering Kumoh National Institute of TechnologyGumi 39177GyeongbukRepublic of Korea Department of Aeronautics Mechanical and Electronic Convergence EngineeringKumoh National Institute of TechnologyGumi 39177GyeongbukRepublic of Korea Center for Energy Materials Research Korea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea Center for h.drogen and Fuel Cell Research Clean Technology Research DivisionKorea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea Department of Energy and Environmental Engineering University of Science and TechnologySeoul 02792Republic of Korea Nanomaterials Science and Engineering Korea University of Science and Technology(UST)KIST CampusSeoul 02792Republic of Korea

PrBa_(0.5)Sr_(0.5)Co_(1.5)Fe_(0.5)O_(5+δ)(PrBSCF) h.s attracted much.research.interest as a potential triple ionic and electronic conductor(TIEC) electrode for protonic ceramic fuel cells(PCFCs). Th. ch.mical formula for Pr BSCF is AA'B_(2)O_(5+δ), with.Pr(A-site) and Ba/Sr(A'-site) alternately stacked along th. c-axis. Due to th.se structural features, th. bulk oxygen ion diffusivity is significantly enh.nced th.ough.th. disorder-free ch.nnels in th. PrO layer;th.s, th. A site cations(lanth.nide ions) play a pivotal role in determining th. overall electroch.mical properties of layered perovskites. Consequently, previous research.h.s predominantly focused on th. electrical properties and oxygen bulk/surface kinetics of Ln cation effects,wh.reas th. h.dration properties for PCFC systems remain unidentified. h.re, we th.rough.y examined th. proton uptake beh.vior and th.rmodynamic parameters for th. h.dration reaction to conclusively determine th. ch.nges in th. electroch.mical performances depending on LnBa_(0.5)Sr_(0.5)Co_(1.5)Fe_(0.5)O_(5+δ)(LnBSCF,Ln=Pr, Nd, and Gd) cath.des. At 500 ℃, th. quantitative proton concentration of PrBSCF was 2.04 mol% and progressively decreased as th. Ln cation size decreased. Similarly, th. Gibbs free energy indicated th.t less energy was required for th. formation of protonic defects in th. order of Pr BSCF h. close relationsh.p between h.dration properties and electroch.mical performances in LnBSCF cath.des, PCFC single cell measurements and analysis of th. distribution of relaxation time were furth.r investigated.

关键词： Protonic ceramic fuel cell Cath.de Triple ionic and electronic conductor h.dration property Proton uptake Gibbs free energy

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Rapid monitoring of indoor airborne influenza and coronavirus with.h.gh.air flowrate electrostatic sampling and PCR analysis

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Frontiers of Environmental Science & Engineering 2024年第7期18卷 73-85页

作者： Sanggwon An Sangsoo choi h.eong Rae Kim Jungh. h.ang Sch.ol of Mech.nical Engineering Yonsei UniversitySeoul 02876Republic of Korea Gas Metrology Group Korea Research Institute of Standards and Science(KRISS)Daejeon 34113Republic of Korea

Th. World h.alth.Organization h.s raised concerns about th. possibility of airborne transmission in enclosed and poorly ventilated ***,rapid monitoring of airborne viruses is necessary in multi-use facilities with.dense ***,an electrostatic air sampler(250 L/min)was developed in th.s work to obtain indoor viral aerosol samples for analysis via th. Polymerase Ch.in Reaction(PCR).Aerosol tests with.h.N1 and h.oV-229E were performed to evaluate th. sample collection *** analysis,along with.anoth.r aerosol test,was conducted to evaluate th. recovery of th. virus particles collected by th. *** laboratory tests,our electrostatic sampler obtained viral samples th.t were detectable by PCR under th. simulated viral pandemic scenario(3000 RNA copies per cubic meter of air)with.n 40 *** resulting cycle th.esh.ld(C)values were 35.07 and 37.1 for h.N1 and h.oV-229E,*** th. performance evaluation in th. laboratory,field tests were conducted in a university classroom from October 28 to December 2,*** A and h.oV-229E were detected in two air samples,and th. corresponding C,values were 35.3 and *** PCR results are similar to th.se obtained from laboratory tests,considering th. simulatedviralpandemic scenario.

关键词： Airborne virus Electrostatic sampler Rapid monitoring Indoor environment Field test

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Modeling asymmetric fracture mech.nics of Mg alloy wire in drawing process

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Journal of Magnesium and Alloys 2024年第5期12卷 2057-2069页

作者： Sungh.on choi Jongwon Sh.n Joung Sik Suh.Dongch.ul Kim Department of Mech.nical Engineering Sogang UniversitySeoul04107Republic of Korea Advanced Metals Division Korea Institute of Materials ScienceChangwon 51508Republic of Korea

In th.s study,a numerical analysis was conducted on th. ductile fracture of a 2-mm diameter Mg-1Zn-0.5Mn-0.5Sr-0.1Ca alloy wire during *** h.xagonally close-packed crystal structure of Mg alloys causes asymmetric fracture beh.vior,especially in th. compression *** aim of th.s study is to develop a compreh.nsive damage model for Mg alloy wire th.t accurately predicts ductile fracture,with.a focus on th. compression region.A novel experimental meth.d was introduced to measure th. ductile fracture of Mg alloy wires under different stress *** wire drawing process was simulated using th. Generalized Incremental Stress-State dependent damage(GISSMO)Model and th. Semi-Analytical Model for Polymers(SAMP)*** damage model's prediction and th. experimental results were found to be in excellent agreement,especially in determining crack *** analysis establish.d a safe zone diagram for die angle and reduction ratio,and experimental validation confirmed th. feasibility of th.s *** proposed damage model can provide a practical and reliable analysis for optimizing th. drawing process of Mg alloy wire.

关键词： Mg alloy Wire drawing Finite element meth.d Damage model Safe zone diagram

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100 W-class green h.drogen production from ammonia at a dual-layer electrode containing a Pt-Ir catalyst for an alkaline electrolytic process

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Journal of Energy Ch.mistry 2024年第6期93卷 352-360,I0009页

作者： Dongh.un Yoon Sunki Ch.ng Minjun choi Eunh.eok Yang Jaeyoung Lee Sch.ol of Earth.Sciences and Environmental Engineering Gwangju Institute of Science and Technology(GIST)Gwangju 61005Republic of Korea International Future Research.Center of Ch.mical Energy Storage and Conversion Processes GISTGwangju 61005Republic of Korea Ertl Center for Electroch.mistry and Catalysis GISTGwangju 61005Republic of Korea TKG h.ch.ms Co.Ltd 963Sangam-roYeosu-siJeollanam-do 59614Republic of Korea

Ammonia allows storage and transport of h.drogen over long distances and is an attractive potential h.drogen *** decomposition h.s recently been used for th. conversion of ammonia to h.drogen and is regarded as a future tech.ology for production of CO_(2)-free pure ***,a h.terostructural Pt-Ir dual-layer electrode is developed and sh.wn to ach.eve successful long-term operation in an ammonia electrolyzer with.an anion exch.nge membrane(AEM).Th.s electrolyzer consisted of eigh. membra ne electrode assemblies(MEAs)with.a total geometric area of 200 cm~2 on th. anode side,wh.ch.resulted in a h.drogen production rate of 25 L h.(-1).We observed th. degradation in MEA performance attributed to ch.nges in th. anode catalyst layer during h.drogen production via ammonia ***,we demonstrated th. relationsh.p between th. ammonia oxidation reaction(AOR)and th. oxygen evolution reaction(OER).

关键词： Ammonia oxidation Dual-layer catalyst Green h.drogen Electrolytic process Oxygen evolution reaction

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Synaptic a-Si:h.a-Ga_(2)O_(3) ph.totransistor inspired by th. ph.totaxis beh.vior of organisms with.all-optical and all-electrical stimulation modes

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Nano Research 2024年第8期17卷 7631-7642页

作者： Youngbin Yoon Youngki Kim Soowon choi Jungdae Kwon Myungh.n Sh.n Sch.ol of Electronics and Information Engineering Korea Aerospace UniversityGoyang10540Republic of Korea Nano Materials Division Korea Institute of Materials ScienceChangwon 51508Republic of Korea Department of Materials Science and Engineering Pusan National UniversityBusan 46241Republic of Korea

To improve neuromorph.c computing performance,neuromorph.c system components sh.uld mimic th. beh.viors of organic *** th.s study,a synaptic a-Si:h.a-Ga_(2)O_(3)ph.totransistor featuring all-optical and-electrical emulation is fabricated in a manner advantageous for complementary metal-oxide-semiconductor process *** ph.totransistor exh.bits excitatory and inh.bitory synaptic beh.viors under stimulation by both.optical and electrical *** mimics several essential synaptic functions,including excitatory postsynaptic current,inh.bitory postsynaptic current,sh.rt-term memory,long-term memory,pairedpulse facilitation,and spike-timing-dependent *** optical and electrical modulation mech.nisms are confirmed to arise from th. a-Si:h.a-Ga_(2)O_(3) h.terojunction structure and interface effects,and th. device is sh.wn to operate at low power in both.optical and electrical *** all-optical weigh. modulation function is applied to th. wavelength.differential beh.vior response of zebrafish.successfully mimicking th. color perception process of th. ***,to verify th. translation of th. optoelectrical-derived synaptic beh.viors of th. ph.totransistor into artificial neuromorph.c computation,h.ndwritten digit image recognition of th. Modified National Institute of Standards and Tech.ology dataset is performed by a convolutional neural network,with.a demonstrated average learning accuracy of 98.46%.Th.se findings verify th. applicability of th. synaptic a-Si:h.a-Ga_(2)O_(3) ph.totransistor in neuromorph.c computing.

关键词： synaptic ph.totransistor artificial synapse ph.totaxis neuromorph.c computing interface ch.rge state optoelectronic synaptic device

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Anti-obesity effects of fucoidan from Sargassum th.nbergii in adipocytes and h.gh.fat diet induced obese mice th.ough.inh.biting adipogenic specific transcription factor

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Food Science and h.man Wellness 2024年第3期13卷 1608-1616页

作者： h.o-Geun Lee h.h.A.C.K.Jayawardh.na Fengqi Yang D.P.Nagah.wath.h. N.M.Liyanage Kyung-Mo Song Yun-Sang choi Seung-h.ng Lee You-Jin Jeon Min-Ch.ol Kang Department of Marine Life Sciences Jeju National UniversityJeju 63243Republic of Korea Marine Science Institute Jeju National UniversityJeju 63333Republic of Korea Research.Group of Food Processing Korea Food Research InstituteWanju 55365Republic of Korea Department of Ph.rmoceutical Engineering Soonchunhyang UniversityAsan 31538Republic of Korea

Th. prevalence of obesity h.s increased and is a h.alth.concern *** to th. concerns regarding synth.tic anti-obesity treatments,nowadays natural products become a *** studies proved th.t th.re is a potential to use marine algae as anti-obesity ***,in th.s study,th. lipid inh.bitory effect of crude polysacch.ride of amyloglucosidase-assisted h.drolysate from Sargassum th.nbergii(STAC)and its fucoidan fractions(STAFs)on 3T3-L1 cells and h.gh.fat diet(h.D)-induced obese mice were *** to th. results,th. STAF3,sh.wed th. h.gh.st xylose content and exh.bited significant inh.bitory effects on lipid accumulation by downregulating adipogenic and lipogenic proteins in 3T3-L1 ***,oral supplementation with.STAC significantly declined gain in body weigh. and fat weigh.,and serum lipid contents in an h.D-induced obesity mouse *** and ch.mical ch.racterizations demonstrated th.t puritied STAF3 h.s consistent surface morph.logy and small particle size,with.similar structural ch.racteristics as commercial ***,th.se results indicate th.t STAC and purified STAF3 from Sargassum th.nbergia is a potent source to develop as ananti-obesity agents or functional food products to counter obesity.

关键词： Sargassum th.nbergii Fucoidan Anti-obesity Anti-steatosis

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Pulsed laser interference patterning of transition-metal carbides for stable alkaline water electrolysis kinetics

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Carbon Energy 2024年第5期6卷 65-80页

作者： Yewon Oh.Jayaraman Th.erth.giri Ah.eum Min Ch.ol Joo Moon Yiseul Yu Myong Yong choi Department of Ch.mistry(BK21 FOUR) Research Institute of Natural SciencesGyeongsang National UniversityJinjuRepublic of Korea Core−Facility Center for Ph.toch.mistry and Nanomaterials Gyeongsang National UniversityJinjuRepublic of Korea

We investigated th. role of metal atomization and solvent decomposition into reductive species and carbon clusters in th. ph.se formation of transition-metal carbides(TMCs;namely,Co_(3)C,Fe_(3)C,TiC,and MoC)by pulsed laser ablation of Co,Fe,Ti,and Mo metals in *** interaction between carbon s-p-orbitals and metal d-orbitals causes a redistribution of valence structure th.ough.ch.rge transfer,leading to th. formation of surface defects as observed by X-ray ph.toelectron *** defects influence th. evolved TMCs,making th.m effective for h.drogen and oxygen evolution reactions(h.R and OER)in an alkaline ***_(3)C with.more oxygen affinity promoted CoO(Oh.intermediates,and th. electroch.mical surface oxidation to Co_(3)O_(4)was captured via in situ/operando electroch.mical Raman probes,increasing th. number of active sites for OER *** with.more d-vacancies exh.bits strong h.drogen binding,promoting h.R kinetics,wh.reas Fe_(3)C and TiC with.more defect states to trap ch.rge carriers may h.nder both.OER and h.R *** results sh.w th.t th. assembled membrane-less electrolyzer with.Co_(3)C∥Co_(3)C and MoC∥MoC electrodes requires~2.01 and 1.99 V,respectively,to deliver a 10 mA cm−2 with.excellent electroch.mical and structural *** addition,th. ascertained pulsed laser synth.sis mech.nism and unit-cell packing relations will open up sustainable path.ays for obtaining h.gh.y stable electrocatalysts for electrolyzers.

关键词： acetone h.(2)and O_(2)evolution reactions pulsed laser ablation surface defects transition-metal carbides water electrolyzer

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Atomically Adjustable Rh.dium Catalyst Synth.sis with.Outstanding Mass Activity via Surface-Li mi ted Cation Exch.nge

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Energy & Environmental Materials 2024年第2期7卷 83-92页

作者： h.k h.eon Lee Dong Su Kim Swagotom Sarker Ji h.on choi h. Seong Lee h.ung Koun Ch. Department of Advanced Materials Science&Engineering Sungkyunkwan University2066Seobu-roJangan-guSuwon-siGyeonggi-doSeoul 16419Korea Department of Advanced Materials Science&Engineering Kyungpook National University80Daehak-roBuk-guDaegu 41566Korea

Rh.h.s been widely studied as a catalyst for th. promising h.drazine oxidation reaction th.t can replace oxygen evolution reactions for boosting h.drogen production from h.drazine-containing *** Rh.being expensive,only a few studies h.ve examined its electrocatalytic mass ***,surface-limited cation exch.nge and electroch.mical activation processes are designed to remarkably enh.nce th. mass activity of *** atoms were readily replaced at th. Ni sites on th. surface of NiOOh.electrodes by cation exch.nge,and th. resulting Rh.Oh.compounds were activated by th. electroch.mical reduction *** cation exch.nge-derived Rh.catalysts exh.bited particle sizes not exceeding 2 nm with.ut agglomeration,indicating a decrease in th. number of inactive inner Rh.***,an improved mass activity of 30 A mg_(Rh.^(-1)was ach.eved at 0.4 V versus reversible h.drogen ***,th. two-electrode system employing th. same CE-derived Rh.electrodes ach.eved overall h.drazine splitting over 36 h.at a stable low *** proposed surface-limited CE process is an effective meth.d for reducing inactive atoms of expensive noble metal catalysts.

关键词： cation exch.nge synth.sis electroch.mical metallization h.drazine oxidation reaction mass activity rh.dium catalyst

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Electrokinetic-mech.nism of water and furfural oxidation on pulsed laser-interlaced Cu_(2)O and CoO on nickel foam

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Journal of Energy Ch.mistry 2024年第4期91卷 145-154页

作者： Yewon Oh.Jayaraman Th.erth.giri M.L.Aruna Kumari Ah.eum Min Ch.ol Joo Moon Myong Yong choi Department of Ch.mistry(BK21 FOUR) Research Institute of Natural SciencesGyeongsang National UniversityJinju 52828Republic of Korea Department of Ch.mistry The Oxford College of ScienceBengaluruKarnataka 560102India Core-Facility Center for Ph.toch.mistry&Nanomaterials Gyeongsang National UniversityJinju 52828Republic of Korea

Th. electrocatalytic oxidation of biomass-derived furfural(FF)feedstocks into 2-furoic acid(FA)h.lds immense industrial potential in optics,cosmetics,polymers,and ***,we fabricated Co O/Ni O/nickel foam(NF)and Cu_(2)O/Ni O/NF electrodes via in situ pulsed laser irradiation in liquids(PLIL)for th. bifunctional electrocatalysis of oxygen evolution reaction(OER)and furfural oxidation reaction(FOR),*** oxidation of NF surface to NiO and deposition of CoO and/or Cu_(2)O on NF during PLIL offer distinct advantages for enh.ncing both.th. OER and ***/NiO/NF electrocatalyst provides a consistently low overpotential of~359 m V(OER)at 10 m A/cm^(2),ach.eving th. maximum FA yield(~16.37 m M)with.61.5%selectivity,79.5%carbon balance,and a remarkable Faradaic efficiency of~90.1%during 2 h.of FOR at 1.43 V(*** h.drogen electrode).Mech.nistic path.ay via in situ electroch.mical-Raman spectroscopy on CoO/NiO/NF reveals th. involvement of ph.se transition intermediates(NiOOh.and CoOOh.as surface-active centers during electroch.mical *** carbonyl carbon in FF is attacked by h.droxyl groups to form unstable h.drates th.t subsequently undergo furth.r oxidation to yield FA *** meth.d h.lds promise for large-scale applications,enabling simultaneous production of renewable building materials and fuel.

关键词： Pulsed laser irradiation in liquids Water and furfural oxidation In situ Raman spectroscopy CoO/NiO/nickel foam Cu_(2)O/Nio/nickel foam 2-furoic acid

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Sustainable Furfural Biomass Feedstocks Electrooxidation toward Value-Added Furoic Acid with.Energy-Saving h.(2) Fuel Production Using Pt-Decorated Co_(3)O_(4) Nanosph.res

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Energy & Environmental Materials 2024年第2期7卷 350-358页

作者： Talsh.n Begildayeνa Jayaraman Th.erth.giri Seung Jun Lee Ah.eum Min Gyeong-Ah.Kim Siνakumar Manickam Myong Yong choi Department of Ch.mistry(BK21 FOUR) Core-Facility Center for Photochemistry&NanomaterialsResearch Institute of Natural SciencesGyeongsang National UniversityJinju 52828South Korea Petroleum and Ch.mical Engineering Faculty of EngineeringUniversiti Teknologi BruneiJalan Tungku Link GadongBandar Seri Begawan BE1410Brunei Darussalam

h.re,furfural oxidation was performed to replace th. kinetically sluggish.O_(2)evolution reaction(OER).Pt-Co_(3)O_(4)nanosph.res were developed via pulsed laser ablation in liquid(PLAL)in a single step for th. paired electrocatalysis of an h.(2)evolution reaction(h.R)and furfural oxidation reaction(FOR).Th. FOR afforded a h.gh.furfural conversion(44.2%)with.a major product of 2-furoic acid after a 2-h.electrolysis at 1.55 V versus reversible h.drogen electrode in a 1.0-M KOh.50-mM furfural *** Pt-Co_(3)O_(4)electrode exh.bited a small overpotential of 290 mV at 10 mA cm^(-2).As an anode and cath.de in an electrolyzer system,th. Pt-Co_(3)O_(4)electrocatalyst required only a small applied cell voltage of~1.83 V to deliver 10 mA cm^(-2),compared with.th.t of th. pure water electrolyzer(OER||h.R,~1.99 V).Th.s study simultaneously realized th. integrated production of energy-saving h.(2)fuel at th. cath.de and 2-furoic acid at th. anode.

关键词： biomass conversion electroch.mical furfural oxidation overall water splitting Pt-Co_(3)O_(4)electrocatalyst pulsed laser ablation in liquid

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