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A Furan-Substituted Polymeric Hole-Transporting Material for Energy Level Regulation and Less Planarity in Colloidal Quantum Dot Solar Cells

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Covalent organic frameworks:Design and applications in electrochemical energy storage devices

能源与环境材料（英文） 2023年第5期6卷 340-346页

作者： Jun woo lee Duck Hoon lee Younghoon Kim Jin Young Park Hyung Ryul You Taiho Park Minjun Kim Jongmin Choi Department of Chemical Engineering Pohang University of Science and Technology(POSTECH)77 Cheongam-RoNam-GuPohang Gyeongbuk 37673Korea Department of Chemical and Environmental Engineering Yale UniversityNew Haven CT 06511USA Department of Energy Science and Engineering Daegu Gyeongbuk Institute of Science and Technology(DGIST)Daegu 42988Korea Department of Chemistry Kookmin UniversitySeoul 02707Korea Department of Chemical Engineering Pohang University of Science and Technology(POSTECH)77 Cheongam-RoNam-GuPohang Gyeongbuk 37673Korea RIKEN Center for Emergent Matter Science(CEMS) 2-1 HirosawaWako Saitama 351-0198Japan

For efficient colloidal quantum dot(CQD)solar cells(CQD-SCs),thiol-passivated p-type CQDs are generally used as a hole-transporting material(HTM);however,there are issues with the control of optoelectrical properties,low thiol passivation rate,and poor morphology with a power conversion efficiency(PCE)of approximately 11％.Although polymeric HTMs have been introduced to address these issues,maximizing efficiency and achieving green-solvent processability and thermal stability for commercialization is ***,we synthesize a novel benzodifuran(BDF)-based HTM(asy-ranPBTBDF)showing an electron-deficient state,low steric hindrance,and low planarity compared to those of a typical benzodithiophene(BDT)-based HTM(asy-ranPBTBDT).BDF properties lead to deep high occupied molecular orbital(HOMO)levels,close π-π stacking,excellent solubility,and amorphous properties related to efficiency,green-solvent processability,and thermal *** these benefits,the asy-ranPBTBDF-based CQD-SC showed enhanced open-circuit voltage(Voc)(0.65 V)and PCE(13.29％)compared to those of the asy-ranPBTBDT-based device(0.63 V and 12.22％)in toxic processes with *** asy-ranPBTBDF-based CQD-SC showed a PCE of 12.51％in a green-solvent process with 2-methylanisole and improved thermal stability at 80 ℃(83.8％retaining after 24 h)owing to less lateral crystallization than the asy-ranPBTBDT-based device(60.8％retaining after 24 h).

关键词： colloidal quantum dot green-solvent photovoltaics semiconducting polymers stability

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InfoMat 2022年第6期4卷 1-35页

作者： Shikai Jin Omar Allam Seung Soon Jang Seung woo lee George W.woodruff School of Mechanical Engineering Georgia Institute of TechnologyAtlantaGeorgiaUSA Computational NanoBio Technology Laboratory School of Material Science and EngineeringGeorgia Institute of TechnologyAtlantaGeorgiaUSA

As an emerging class of crystalline organic material,covalent organic frameworks(COFs)possess uniform porosity,versatile functionality,and precise control over designated *** from the favorable charge and mass transport pathways offered by the porous framework,COFs can also exhibit designed reversible redox *** the past few years,their potential has attracted a great deal of attention for charge storage and transport applications in various electrochemical energy storage devices,and numerous design strategies have been proposed to enhance the corresponding electrochemical *** review summarizes the working principle and synthesis methods of COFs and discusses significant findings for supercapacitors and various rechargeable battery systems,emphasizing the representative design strategies and their underlying relationship with electrochemical *** addition,key advances achieved by computations are highlighted along with the challenges and prospects in this field.

关键词： covalent organic frameworks rechargeable batteries redox-active electrodes solid electrolyte supercapacitors

Effect of molybdenum on interfacial properties of titanium carbide reinforced Fe composite

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Journal of Materials Science & Technology 2022年第12期107卷 252-258页

作者： Seungchan Cho Junghwan Kim Ilguk Jo Jae Hyun Park Jaekwang lee Hyun-Uk Hong Bong Ho lee wook Ryol Hwang Dong-woo Suh Sang-Kwan lee Sang-Bok lee Composites Research Division Korea Institute of Materials Science(KIMS)Changwon 51508South Korea Advanced Materials Engineering Dong-Eui UniversityBusan 47340South Korea Department of Aerospace and Software Engineering Gyeongsang National UniversityJinju 52828South Korea Department of Physics Pusan National UniversityBusan 46241South Korea Department of Materials Convergence and System Engineering Changwon National UniversityChangwon 51140South Korea Center for Core Research Facilities Daegu Gyeongbuk Institute of Science and TechnologyDaegu 42988South Korea School of Mechanical Engineering Gyeongsang National UniversityJinju 52828South Korea Graduate Institute of Ferrous Technology Pohang University of Science and TechnologyGyeongbuk 37673South Korea

This study shows that the mechanical strength of the composite of Fe matrix and titanium carbide(Ti C)ceramic particles is significantly enhanced with addition of molybdenum(Mo) atoms. Ti C reinforced Fe(Fe-0.2C-7Mn) composites with and without Mo were fabricated by a liquid pressing infiltration(LPI)process and the effect of Mo on interfacial properties of TiC–Fe composite was investigated using atomic probe tomography(APT) analysis, molecular dynamics(MD) simulations, first-principle density functional theory(DFT), and thermodynamic calculations. First, DFT calculations showed that total energies of the Mo-doped Ti C–Fe superlattices strongly depend on the position of Mo defects, and are minimized when the Mo atom is located at the TiC/Fe interface, supporting the probable formation of MoC-like interphase at the TiC/Fe interface region. Then, APT analysis confirmed the DFT predictions by finding that about6.5 wt.% Mo is incorporated in the Ti C–Fe(Mo) composite and that sub-micrometer thick(Ti,Mo)C interphase is indeed formed near the interface. The MD simulations show that Mo atoms migrate to the Mo-free TiC–Fe interface at elevated temperatures and the mechanical strength of the interface is considerably enhanced, which is in good agreement with experimental observations.

关键词： Metal matrix composites(MMCs) Titanium carbide Fe matrix composite Infiltration Molybdenum Interfacial property

Mechanical strength and corrosion resistance of Al-additive friction stir welded AZ31B joints

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Journal of Magnesium and Alloys 2023年第5期11卷 1519-1535页

作者： Jae-Yeon Kim Eun-woo Kim Dong-O Kim Eun-Kyo Ju Ji-Eun lee Jaeheon lee Jai-Won Byeon Mining Engineering Department Colorado School of MinesGoldenCO 80401USA Department of Materials Science and Engineering Seoul National University of Science and TechnologySeoul 01811Republic of Korea

Compared to other structural alloys,magnesium alloys have a relatively poor corrosion resistance and low mechanical strength,which can be further deteriorated when these alloys are subjected to joining processes using the existing joining ***,we propose for the first time an additive friction stir-welding(AFSW)using fine Al powder as an additive to improve the mechanical strength as well as corrosion resistance of AZ31B weld *** is a solid-state welding method of forming a high-Al AZ31B joint via an in-situ reaction between pure Al powders filled in a machined groove and the AZ31B *** optimize the process parameters,AFSW was performed under different rotational and transverse speeds,and number of passes,using tools with a square or screw *** particular,to fabricate a weld zone,where the Al was homogenously dispersed,the effects of the groove shape were investigated using three types of grooves:surface one-line groove,surface-symmetric grooves,and inserted symmetric *** homogenous and defect-less AFS-welded AZ31B joint was successfully fabricated with the following optimal parameters:1400 rpm,25 mm/min,four passes,inserted symmetric grooves,and the tool with a square *** AFSW fully dissolved the additive Al intoα-Mg and in-situ precipitated Mg_(17)Al_(12)particles,which was confirmed via scanning electron microscopy,transmission electron microscope,and X-ray diffraction *** microhardness,joint efficiency,and elongation at the fracture point of the AFS-welded AZ31B joint were 80 HV,101%,and 8.9%,*** values are higher than those obtained for the FS-welded AZ31 joint in previous *** corrosion resistance of the AFS-welded AZ31B joint,evaluated via hydrogen evolution measurements and potentiodynamic polarization tests,was enhanced to 55%relative to the FS-welded AZ31B joint.

关键词： AZ31B magnesium alloy Additive friction stir-welding In-situ reaction Mg_(17)Al_(12)particles Joint efficiency Corrosion resistance

Aqueous-processable,naphthalene diimide-based polymers for eco-friendly fabrication of high-performance,n-type organic electrolyte-gated transistors

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Science China Chemistry 2022年第5期65卷 973-978页

作者： Dahyun Jeong Min Je Kim Seungjin lee Jin-woo lee Youngwoong Kim Hyeong Jun Kim Jeong Ho Cho Bumjoon J.Kim Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea Department of Chemical and Biomolecular Engineering Yonsei UniversitySeoul 03722Republic of Korea Department of Chemical and Biomolecular Engineering Sogang UniversitySeoul 04107Republic of Korea

Organic electrolyte-gated transistors(OEGTs) have the benefits of low power consumption and large current ***,the electrical performance of n-type OEGTs lags far behind that of p-type *** this study,we design a series of polymers,P(NDITEG-T) and P(NDIMTEG-T),comprising a naphthalene diimide backbone for n-type charge transport and oligo(ethylene glycol)(OEG) side chains for high ionic conductivity and eco-friendly solution *** incorporation of the OEG chain facilitates the electrochemical doping of the semiconductor by ions to realize high-performance,n-type ***,in OEGTs,P(NDITEG-T) achieves a high electron mobility of 1.0 × 10^(-1) cm^(2) V^(-1) s^(-1),which represents the highest value reported for solution-processed,n-type *** is noted that the fabrication of the OEGTs is achieved by solution processing with eco-friendly ethanol/water mixtures in virtue of the hydrophilic OEG *** work demonstrates the molecular design of the P(NDITEG-T) polymer and its significant ability to produce aqueous-processable,high-performance,and n-type OEGTs.

关键词： organic electrolyte-gated transistors n-type transistors oligo(ethylene glycol)polymers eco-friendly solution process high electron mobility

Use of various MgO resources for high-purity Mg metal production through molten salt electrolysis and vacuum distillation

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Journal of Magnesium and Alloys 2023年第2期11卷 562-579页

作者： Hyeong-Jun Jeoung Tae-Hyuk lee Youngjae Kim Jin-Young lee Young Min Kim Toru HOkabe Kyung-woo Yi Jungshin Kang Korea Institute of Geoscience and Mineral Resources 124 Gwahak-ro Yuseong-guDaejeon 34132South Korea Department of Materials Science and Engineering Seoul National University1 Gwanak-roGwanak-guSeoul 08826South Korea Department of Resources Engineering University of Science and Technology217 Gajeong-ro Yuseong-guDaejeon 34113South Korea Korea Institute of Materials Science 797 Changwondae-roSeongsan-guChangwonGyeongnam 51508South Korea Institute of Industrial Science The University of Tokyo4-6-1 KomabaMeguro-kuTokyo 153-8505Japan School of Materials Science and Engineering Pusan National University2 Busandaehak-roGeumjeong-guBusan 44241South Korea

A green and effective electrolytic process was developed to produce high-purity Mg metal using primary and secondary resources containing Mg O as a feedstock. The electrolysis of various Mg O resources was conducted using a Cu cathode in MgF2– LiF – KCl molten salt at 1043 K by applying an average current of 1.44 A for 12.5 h. The electrolysis of calcined North Korean magnesite and seawater Mg O clinker yielded Mg alloys of MgCu2and(Cu) phases with current efficiencies of 89.6–92.4%. The electrolysis of oxidized Mg O-C refractory brick, aged ferronickel slag, and ferronickel slag yielded Mg alloys of MgCu2and(Cu) phases with current efficiencies of 59.3–92.3%. The vacuum distillation of Mg alloys obtained was conducted at 1300 K for 10 h to produce high-purity Mg metal. After vacuum distillation, Mg metal with a purity of above 99.994% was obtained. Therefore, this study demonstrates the feasibility of the production of high-purity Mg metal from various Mg O resources using a novel electrolytic process with a Cu cathode, followed by vacuum distillation.

关键词： High-purity magnesium Magnesium oxide resources Electrolytic process Metal cathode Vacuum distillation

Highly dense and ultrathin gadolinia-doped ceria interlayer for enhanced performance of large-area anode-supported solid oxide fuel cell

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Progress in Natural Science:Materials International 2023年第5期33卷 733-741页

作者： Sang woo Shin Amjad Hussain Muhammad Zubair Khan Dong woo Joh Tak-Hyung Lim Seung-Bok lee Jong-Eun Hong Joon Hyung Shim Rak-Hyun Song Hydrogen Energy Research Division Korea Institute of Energy Research Department of Mechanical Engineering Korea University Department of Advanced Energy and System Engineering Korea University of Science and Technology(UST) 4. Department of Materials Science & Engineering Pak-Austria Fachhochschule: Institute of Applied Sciences and Technology

The fabrication of a highly dense and ultrathin Gd doped ceria(GDC) interlayer on a large-area, porous electrolyte-coated planar anode support using vacuum slurry coating is studied for application in solid oxide fuel cells(SOFCs). The electrolyte-coated planar anode support body is fabricated by tape casting and pre-sintering is performed at 1100, 1150, and 1200°C. The GDC interlayer is coated onto the pre-sintered electrolyte-coated anode support using a vacuum slurry coating process with different immersion times(30–60 s). A highly dense and ultrathin GDC interlayer with a thickness of 1.48 μm is produced after co-sintering at 1400°C. The 1200°C pre-sintered electrolyte-coated anode support showed a thin and highly dense GDC interlayer which is attributed to a lower shrinkage difference between the coated GDC interlayer and pre-sintered body. The electrochemical performance of a vacuum slurry-coated GDC interlayer cell is 38 % higher compared to that of the screen-printed GDC-coated cell at 700°C due to the greatly reduced Ohmic and electrode polarization resistances. The considerable improvement in the performance is attributed to the ultrahigh GDC density which has prevented the secondary phase formation between the cathode and electrolyte. This study presents the economical, scalable, and reproducible process for the fabrication of highly robust GDC interlayer for the large-area planar anode-supported SOFCs.

关键词： Solid oxide fuel cell Vacuum slurry coating GDC interlayer Sintering Performance

Crystal Facet Engineering of TiO_(2) Nanostructures for Enhancing Photoelectrochemical Water Splitting with BiVO_(4) Nanodots

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Nano-Micro Letters 2022年第3期14卷 201-215页

作者： Mi Gyoung lee Jin wook Yang Hoonkee Park Cheon woo Moon Dinsefa M.Andoshe Jongseong Park Chang‑Ki Moon Tae Hyung lee Kyoung Soon Choi woo Seok Cheon Jang‑Joo Kim Ho Won Jang Department of Materials Science and Engineering Research Institute of Advanced MaterialsSeoul National UniversitySeoul 08826Republic of Korea Department of Chemistry and Nanoscience Ewha Womans UniversitySeoul 03693Republic of Korea National Research Facilities and Equipment Center Korea Basic Science InstituteDaejeon 34133Republic of Korea Advanced Institute of Convergence Technology Seoul National UniversitySuwon 16229Republic of Korea

Although bismuth vanadate(BiVO4)has been promising as photoanode material for photoelectrochemical water splitting,its charge recombination issue by short charge diffusion length has led to various studies about heterostructure *** a hole blocking layer of BiVO4,titanium dioxide(TiO_(2)) has been considered unsuitable because of its relatively positive valence band edge and low electrical ***,a crystal facet engineering of TiO_(2) nanostructures is proposed to control band structures for the hole blocking layer of BiVO4 *** design two types of TiO_(2) nanostructures,which are nanorods(NRs)and nanoflowers(NFs)with different(001)and(110)crystal facets,respectively,and fabricate BiVO4/TiO_(2) heterostructure *** BiVO4/TiO_(2) NFs showed 4.8 times higher photocurrent density than the BiVO4/TiO_(2) *** decay time analysis and time-resolved photoluminescence reveal the enhancement is attributed to the reduced charge recombination,which is originated from the formation of type II band alignment between BiVO4 nanodots and TiO_(2) *** work provides not only new insights into the interplay between crystal facets and band structures but also important steps for the design of highly efficient photoelectrodes.

关键词： Crystal facet control Bismuth vanadate Titanium dioxide Heterojunction Water splitting

Spatial and spectral measurement of laser-driven protons through radioactivation

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Nuclear Science and Techniques 2023年第12期34卷 30-39页

作者： Yin‑Ren Shou Xue‑Zhi Wu Gwang‑Eun Ahn Seung Yeon Kim Seong Hoon Kim Hwang woon lee Jin woo Yoon Jae Hee Sung Seong Ku lee Xue‑Qing Yan Il woo Choi Chang Hee Nam Center for Relativistic Laser Science Institute for Basic ScienceGwangju 61005Republic of Korea School of Physics Peking UniversityBeijing 100871China Advanced Photonics Research Institute Gwangju Institute of Science and TechnologyGwangju 61005Republic of Korea Department of Physics and Photon Science Gwangju Institute of Science and TechnologyGwangju 61005Republic of Korea

The simultaneous measurement of the spatial profile and spectrum of laser-accelerated protons is important for further optimization of the beam qualities and *** report a detailed study regarding the underlying physics and regular procedure of such a measurement through the radioactivation of a stack composed of aluminum,copper,and CR-39 plates as well as radiochromic films(RCFs).After being radioactivated,the copper plates are placed on imaging plates(IPs)to detect the positrons emitted by the reaction products through contact *** spectrum and energy-dependent spatial profile of the protons are then obtained from the IPs and confirmed by the measured ones from the RCFs and CR-39 *** also discuss the detection range,influence of electrons,radiation safety,and spatial resolution of this ***,insights regarding the extension of the current method to online measurements and dynamic proton imaging are also provided.

关键词： Laser-driven proton acceleration Proton-induced nuclear reaction Radioactivation measurement Contact imaging