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Integration of earth-abundant cocatalysts for high-performance photoelectrochemical energy conversion

Journal of Energy Chemistry 2024年第1期88卷 336-355,I0008页

作者： Joonhee Ma Sang Hyun Ahn Soo young kim Department of Materials Science and Engineering Korea UniversitySeoul 02841Republic of Korea School of Chemical Engineering and Materials Science Chung-Ang University84 Heukseok-roDongjak-guSeoul 06974Republic of Korea

Photoelectrochemical(PEC)energy conversion has emerged as a promising and efficient approach to sustainable energy harvesting and *** utilizing semiconductor photoelectrodes,PEC devices can harness solar energy and drive electrochemical reactions such as water splitting or carbon dioxide(CO_(2))reduction to generate clean fuels and value-added ***,PEC energy conversion faces several challenges such as high overpotential,sluggish reaction kinetics,charge carrier recombination,and stability issues,which limit its practical ***,significant research has been conducted to improve the overall conversion efficiency of PEC *** particularly promising approach is the use of cocatalysts,which involves introducing specific cocatalysts onto the photoelectrode surface to promote charge separation,improve reaction kinetics,and reduce the overpotential,thereby enhancing the overall performance of PEC energy *** review provides a comprehensive overview of the recent developments in the earth-abundant cocatalysts for PEC water splitting and CO_(2) *** main earth-abundant catalysts for the PEC water splitting include transition-metal dichalcogenide(TMD)-based materials,metal phosphides/carbides,and metal oxides/***,PEC-CO_(2)RR was divided into C_(1) and C_(2+)based on the final product since various products could be produced,focusing on diverse earth-abundant materials-based *** addition,we provide and highlight key advancements achieved in the very recent reports on novel PEC system design engineering with ***,the current problems associated with PEC systems are discussed along with a suggested direction to overcome these obstacles.

关键词： Solar energy Photo-electrochemical Water splitting CO_(2)reduction Cocatalysts

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In situ infrared, Raman and X-ray spectroscopy for the mechanistic understanding of hydrogen evolution reaction

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Journal of Energy Chemistry 2024年第3期90卷 632-651,I0014页

作者： Andi Haryanto Kyounghoon Jung chan Woo Lee Dong-Wan kim Department of Chemistry Kookmin UniversitySeoul 02707Republic of Korea School of Civil Environmental and Architectural EngineeringKorea UniversitySeoul 02841Republic of Korea

Hydrogen production by water reduction reactions has received considerable attention because hydrogen is considered a clean-energy carrier,key for a sustainable energy *** methods have been widely used to study the reaction mechanism of the hydrogen evolution reaction(HER),but the calculation results need to be supported by experimental results and direct evidence to confirm the mechanistic *** this review,we discuss the fundamental principles of the in situ spectroscopic strategy and a theoretical model for a mechanistic understanding of the *** addition,we investigate recent studies by in situ Fourier transform infrared(FTIR),Raman spectroscopy,and X-ray absorption spectroscopy(XAS) and cover new findings that occur at the catalyst-electrolyte interface during *** spectroscopic strategies provide practical ways to elucidate catalyst phase,reaction intermediate,catalyst-electrolyte interface,intermediate binding energy,metal valency state,and coordination environment during HER.

关键词： Hydrogen evolution reaction Infrared spectroscopy Raman spectroscopy X-ray absorption spectroscopy Reaction mechanism

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Factors associated with significant liver fibrosis assessed using transient elastography in general population

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World Journal of Gastroenterology 2015年第4期21卷 1158-1166页

作者： Seng chan You Kwang Joon kim Seung Up kim Beom Kyung kim Jun Yong Park Do young kim Sang Hoon Ahn Won Jae Lee Kwang-Hyub Han Department of Internal Medicine Yonsei University College of MedicineSeoul 120-752South Korea Division of Endocrinology and Metabolism Yonsei University College of MedicineSeoul 120-752South Korea Institute of Gastroenterology Yonsei University College of MedicineSeoul 120-752South Korea Liver Cirrhosis Clinical Research Center Seoul 120-752South Korea Seoul Gookgwain School Seoul 110-521South Korea

AIM: To investigate the prevalence of significant liver fibrosis assessed using transient elastography(TE) and its predictors in asymptomatic general ***: A total of 159 subjects without chronic viral hepatitis who underwent comprehensive medical health check-up between January 2012 and July 2012 were prospectively recruited. Significant liver fibrosis was defined as liver stiffness value > 7.0 k ***: The mean age and body mass index(BMI) of the study population(men 54.7%) was 56.0 years and 24.3 kg/m2. Among the study subjects, 11(6.9%) showed significant liver fibrosis. On univariate analysis, BMI, alanine aminotransferase(ALT), homeostasis model assessment of insulin resistance, carotid intimal media thickness(IMT), number of calcified plaques on carotid ultrasound, and visceral fat area on computed tomography were significantly higher in subjects with significant liver fibrosis than in those without(all P < 0.05). However, on multivariate analysis, BMI [odds ratio(OR) =1.487; P = 0.045], ALT(OR = 1.078; P = 0.014), carotid IMT(OR = 3.244; P = 0.027), and the number of calcified carotid plaques(OR = 1.787; P = 0.031) were independent predictors of significant liver fibrosis. CONCLUSION: The prevalence of significant liver fibrosis assessed using TE was 6.9% in apparently healthy subjects. High BMI, high ALT, thicker carotid IMT, and higher numbers of calcified carotid plaqueswere independently associated with the presence of significant liver fibrosis.

关键词： Transient elastography Healthy subjects Fibroscan

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Absence of enhancement in a lesion does not preclude primary central nervous system T-cell lymphoma:A case report

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World Journal of Clinical Cases 2024年第2期12卷 374-382页

作者： chan-Seop kim Chi-Hoon Choi Kyung Sik Yi Yook kim Jisun Lee chang Gok Woo young Hun Jeon Department of Radiology Chungbuk National University HospitalChungbuk National University College of MedicineCheongju-si 28644Chungcheongbuk-doSouth Korea Department of Pathology Chungbuk National University HospitalChungbuk National University College of MedicineCheongju-si 28644Chungcheongbuk-doSouth Korea Department of Radiology Seoul National University HosptialSeoul 03080South Korea

BACKGROUND Primary central nervous system lymphoma(PCNSL)is a non-Hodgkin lymphoma that originates in the central nervous system(CNS)and is exclusively limited to the *** most PCNSLs are diffuse large B-cell lymphomas,primary CNS T-cell lymphomas(PCNSTLs)are *** typically demonstrate some degree of enhancement on contrast-enhanced magnetic resonance imaging(MRI).To the best of our knowledge,non-enhancing PCNSTL has not been reported *** SUMMARY A 69-year-old male presented to the neurology department with complaints of mild cognitive impairment and gradual onset of left lower leg weakness over a span of two *** MRI showed asymmetric T2-hyperintense lesions within the *** enhancement was observed on the contrast-enhanced T1 *** initial diagnosis was neuro-Behçet’s *** high-dose steroid therapy,no alterations in the lesions were identified on initial *** patient’s symptoms deteriorated *** MRI performed one month after the initial scan revealed an increased lesion ***,brain biopsy confirmed the diagnosis of *** patient underwent definitive combined ***,the patient developed bacteremia and died of septic shock approximately three months after *** The absence of enhancement in the lesion did not rule out PCNSTL.A biopsy approach is advisable for pathological confirmation.

关键词： Central nervous system neoplasms Non-Hodgkin Lymphoma T-cell Lymphoma Primary central nervous system lymphoma Primary central nervous system T-cell lymphoma Case report

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Green Nanocomposites Made With Polyvinyl Alcohol and Cellulose Nanofibers Isolated From Recycled Paper

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Journal of Renewable Materials 2019年第7期7卷 621-629页

作者： Le Van Hai Lindong Zhai Hyun chan kim Jung Woong kim Jaehwan kim Creative Research Center for Nanocellulose Future Composites Inha UniversityIncheonRepublic of Korea Department of Pulp and Paper Technology Phutho College of Industry and TradePhuthoVietnam

This paper reports green nanocomposites made by blending polyvinyl alcohol(PVA)with cellulose nanofiber(CNF)isolated from recycled deinked copy/printing paper(DIP).The reinforcement effect of DIPCNF in the nanocomposites is compared with other CNFs isolated from native cotton and hardwood by means of *** prepared PVA-CNF nanocomposites are characterized in terms of morphology,chemical interaction,structural,thermal and mechanical properties.X-ray diffraction and Fourier transform infrared spectroscopy confirm the reinforcing ability of cellulose nanofibers into *** blending CNFs into PVA matrix,the thermal stability of the nanocomposites is improved and DIPCNF shows similar enhancement effect with COCNF and *** prepared nanocomposites exhibit 50%young’s modulus improvement by adding 6%of CNF and DIPCNF exhibits similar enhancement of the mechanical properties to COCNF and HWCNF in the *** indicates that the use of DIPCNF is beneficial for environment protection,resource retaining and save energy in comparison with COCNF and HWCNF.

关键词： Green nanocomposite cellulose TEMPO-oxidation recycled paper,polyvinyl alcohol

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A New Efficient Synthetic Method for 3-1odothyronamine and Its Potent Hypothermic Efficacy

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Chinese Journal of Chemistry 2011年第10期29卷 2205-2208页

作者： kim, Joong-Gon Song, young-Kyu Jeon, Su-Yeon Lim, Ye-Ji Ju, Hyunwo Choi, Inho Chung, chan-Moon Biotechnology Division Hanwha Chemical R＆D Center Daejeon 305-345 Korea Department of Chemistry and Medical Chemistry Yonsei University Wonju Gangwon-do 220- 710 Korea Department of Biological Science and Technology Yonsei University Wonju Gangwon-do 220-710 Korea

We developed a new efficient synthetic method for a 3-iodothyronamine （TjAM） that has advantages of less synthetic steps and much higher overall yield compared to those in the conventional method. Our animal study s... 详细信息

关键词： 3-iodothyronamine hibernation-like state ICR mouse

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Standard Embeddings of Smooth Schubert Varieties in Rational Homogeneous Manifolds of Picard Number 1

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Acta Mathematica Sinica,English Series 2018年第3期34卷 466-487页

作者： Shin-young kim Kyeong-Dong PARK Department of Mathematics and Statistics Masaryk University Brno Czech Center for Geometry and Physics Institute for Basic Science ( IBS) Pohang Korea

Smooth Schubert varieties in rational homogeneous manifolds of Picard number 1 are horospherical varieties. We characterize standard embeddings of smooth Schubert varieties in rational homogeneous manifolds of Picard number 1 by means of varieties of minimal rational tangents. In particular, we mainly consider nonhomogeneous smooth Schubert varieties in symplectic Grassmannians and in the 20-dimensional F_4- homogeneous manifold associated to a short simple root.

关键词： Smooth Schubert varieties rational homogeneous manifolds variety of minimal rational tangents standard embeddings Cartan-Fubini extension

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Mitochondrial H_(2)S_(n)-Mediated Anti-Inflammatory Theranostics

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Nano-Micro Letters 2021年第12期13卷 1-13页

作者： Won young kim Miae Won Seyoung Koo Xingcai Zhang Jong Seung kim Department of Chemistry Korea UniversitySeoul 02841Korea John A.Paulson School of Engineering and Applied Sciences Harvard UniversityCambridgeMA 02138USA School of Engineering Massachusetts Institute of TechnologyCambridgeMA 02139USA

The insistent demand for space-controllable delivery,which reduces the side effects of non-steroidal antiinflammatory drugs(NSAIDs),has led to the development of a new theranostics-based approach for anti-inflammatory *** current anti-inflammatory treatments can be improved by designing a drug delivery system responsive to the inflammatory site biomarker,hydrogen polysulfide(H_(2)S_(n)).Here,we report a noveltheranostic agent 1(TA1),consisting of three parts:H_(2)S_(n)-mediated triggering part,a two-photon fluorophore bearing mitochondria targeting unit(Rhodol-TPP),and anti-inflammatory COX inhibitor(indomethacin).In vitro experiments showed that TA1 selectively reacts with H_(2)S_(n)to concomitantly release both Rhodol-TPP and ***-microscopy imaging of inflammation-inducedlive cells suggested that TA1 is localized in the mitochondria where the H_(2)S_(n)is *** TA1 reacted with H_(2)S_(n)in the endogenous and exogenous H_(2)S_(n)environments and in lipopolysaccharide treated inflammatory ***,TA1 suppressed COX-2 level in the inflammatory-induced cells and prostaglandin E 2(PGE2)level in blood serum from inflammation-induced mouse *** vivo experiments with inflammation-induced mouse models suggested that TA1 exhibits inflammation-site-elective drug release followed by significant therapeutic e ects,showing its function as a theranostic agent,capable of both anti-inflammatory therapy and precise *** behavior of TA1 is highly applicable in vivo model therapeutics for the inflammatory disease.

关键词： Theranostics Anti-inflammation Mitochondria Hydrogen polysulfides

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Wide speed range for traction motor in braking force of electric braking control system

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Journal of Central South University 2014年第10期21卷 3837-3843页

作者： young-Choon kim Moon-Taek Cho Division of Mechanical and Automotive Engineering College of EngineeringKongju National University Department of Electrical & Electric Engineering Daewon University College

A vehicle stopping method using an electric brake until a traction motor is stopped is studied. At the moment of vehicle stop, electric brake is changed to control mode where torque is reduced at a low speed. Gradient is controlled by estimating the load torque of motor, thereby traction motor is not rotated after stop. In addition, coasting operation and brake test are performed from normal-opposite operation and start using a small-scale model comprising the inertial load equipment and the power converter. Further, traction motor is made to be equipped with a suspension torque. Pure electric braking that makes traction motor stop by an air brake at the time of stop is also implemented. Constant torque range and constant power range are expanded during braking so that braking force is secured with the electric brakes even in high speed region. Therefore, vehicle reduction effect can be expected by reducing parts related with an air brake which is not used frequently by using a pure electric brake in the M car in wide speed region. Further, maintenance of brake system can be reduced. Besides, ride comfort of passenger in the electric rail car, energy efficiency improvement, and noise reduction effect can be additionally expected. Further, an improved brake method that uses only an electric brake till motor stop is proposed by comparing those in the blending brake that uses an air brake while reducing brake torque at vehicle stop.

关键词： wide speed range electric braking control traction motor

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Fabrication of Dual-pore Scaffolds Using a Combination of Wire-Networked Molding （WNM） and Non-solvent Induced Phase Separation （NIPS） Techniques

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Journal of Bionic Engineering 2015年第4期12卷 565-574页

作者： Dong Guk Sohn Myoung Wha Hong young Yul kim young-Sam Cho Division of Mechanical and Automotive Engineering College of Engineering Wonkwang University 460 Iksandae-ro Iksan Jeonbuk 570-749 Republic of Korea Department of Orthopedics Daejeon St. Mary's Hospital Catholic University of Korea 64 Daeheung-ro Jung-gu Daejeon 301-723 Republic of Korea

In this study, to fabricate dual-pore scaffolds with interconnected pores, Non-solvent Induced Phase Separation （NIPS） and Wire-Network Molding （WNM） techniques were combined. First, a mold with uniform slits was prepared, and needles were inserted into the mold. Subsequently, polycaprolactone （PCL） pellets were dissolved in tetrahydrofuran （THF） at a specified ratio. The slurry was mixed using hot plate stirrer at 1200 rpm for 24 hours at 40 ~C. The PCL slurry was subsequently injected into the mold. Thereafter, to exchange the THF （solvent） with the ethanol （non-solvent）, the mold was soaked in an ethanol bath. After removing the mold from the ethanol bath, the needles were removed from the mold. Consequently, dual-pore scaffold with interconnected pores was obtained. The surface morphology of the fabricated scaffolds were observed using Scanning Electron Microscope （SEM）. Moreover, cell culture experiments were performed using the CCK-8 assay, and the characteristics of cells grown on the dual-pore scaffolds were assessed and were compared with the NIPS-based 3D plotting scaffold.

关键词： tissue engineering scaffold polycaprolactone (PCL) Wire-Network Molding (WNM) Non-solvent Induced Phase Separation (NIPS)

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