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A review of understanding electrocatalytic reactions in energy conversion and energy storage systems via scanning electrochemical microscopy

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Journal of Energy Chemistry 2024年第4期91卷 155-177页

作者： Jihye Park Jong Hwan Lim Jin-Hyuk Kang Jiheon Lim ho Won Jang hosun Shin sun Hwa Park Interdisciplinary Materials Measurement Institute Korea Research Institute of Standards and ScienceDaejeon 34113Republic of Korea Department of Material Science and Engineering Seoul National UniversitySeoul 08826Republic of Korea Department of Applied Measurement Science University of Science and TechnologyDaejeon 34113Republic of Korea

To address climate change and promote environmental sustainability,electrochemical energy conversion and storage systems emerge as promising alternative to fossil fuels,catering to the escalating demand for *** optimal energy efficiency and cost competitiveness in these systems requires the strategic design of electrocatalysts,coupled with a thorough comprehension of the underlying mechanisms and degradation behavior occurring during the electrocatalysis *** electrochemical microscopy(SECM),an analytical technique for studying surface electrochemically,stands out as a powerful tool offering electrochemical *** possesses remarkable spatiotemporal resolution,enabling the visualization of the localized electrochemical activity and surface *** review compiles crucial research findings and recent breakthroughs in electrocatalytic processes utilizing the SECM methodology,specifically focusing on applications in electrolysis,fuel cells,and metal–oxygen batteries within the realm of energy conversion and storage *** with an overview of each energy system,the review introduces the fundamental principles of SECM,and aiming to provide new perspectives and broadening the scope of applied research by describing the major research categories within SECM.

关键词： Scanning electrochemical microscopy Electrocatalyst Electrocatalysis Water splitting Fuel cell Metal-oxygen battery

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High Performance Structural Steels for Shipbuilding and Offshore Structures

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Journal of Iron and Steel Research International 2011年第S1期18卷 90-98页

作者： Choo Wung-Yong Suh In-Shik Kim Sang-ho An Gyu-Baek Lee Chang-sun Technical Research Laboratories POSCO1 Geodong-dongNam-guPohangGyungbuk790-785Korea

Recently,there have been the increase of ship size and the development of oil and gas in arctic *** trends have led to the requirements such as high strength,good toughness at low temperature and good *** high performance structural steels for shipbuilding and arctic offshore structure have been developed by our own micro-alloying and TMCP technologies.M-A constituent was precisely controlled in the both HAZ and base metal to get high toughness at low ***,the grain growth of austenite at HAZ was effectively suppressed by thermally stable TiN particles,leading to a good HAZ *** the other hand,there has been the key issue of crack arrestability in large size container *** effect of joint design on crack arrestability was investigated to prevent a catastrophic failure along the block joint of hatch side coaming.A brittle crack arrest technique was developed without block joint shift,using an arrest weld in the end of hatch side coaming weld line.

关键词： shipbuilding offshore weldability toughness micro-alloying TMCP brittle crack crack arrestability

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Long-lasting,reinforced electrical networking in a high-loading Li_(2)S cathode for high-performance lithium–sulfur batteries

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Carbon Energy 2023年第8期5卷 1-14页

作者： Hun Kim Kyeong-Jun Min Sangin Bang Jang-Yeon Hwang Jung ho Kim Chong SYoon Yang-Kook sun Department of Energy Engineering Hanyang UniversitySeoulRepublic of Korea Department of Materials Science and Engineering Chonnam National UniversityGwangjuRepublic of Korea Institute for Superconducting&Electronic Materials(ISEM) Australian Institute of Innovative Materials(AIIM)University of WollongongNew South WalesNorth WollongongAustralia Department of Materials Science and Engineering Hanyang UniversitySeoulRepublic of Korea

Realizing a lithium sulfide(Li_(2)S)cathode with both high energy density and a long lifespan requires an innovative cathode design that maximizes electrochemical performance and resists electrode ***,a high-loading Li_(2)S-based cathode with micrometric Li_(2)S particles composed of two-dimensional graphene(Gr)and one-dimensional carbon nanotubes(CNTs)in a compact geometry is developed,and the role of CNTs in stable cycling of high-capacity Li–S batteries is *** a dimensionally combined carbon matrix,CNTs embedded within the Gr sheets create robust and sustainable electron diffusion pathways while suppressing the passivation of the active carbon *** a unique point,during the first charging process,the proposed cathode is fully activated through the direct conversion of Li_(2)S into S_(8) without inducing lithium polysulfide *** direct conversion of Li_(2)S into S_(8) in the composite cathode is ubiquitously investigated using the combined study of in situ Raman spectroscopy,in situ optical microscopy,and cryogenic transmission electron *** composite cathode demonstrates unprecedented electrochemical properties even with a high Li_(2)S loading of 10 mg cm^(–2);in particular,the practical and safe Li–S full cell coupled with a graphite anode shows ultra-long-term cycling stability over 800 cycles.

关键词： carbon nanotubes electrical network high energy high loading Li_(2)S cathode lithium-sulfur batteries

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Accelerated precipitation behavior of cast Mg-Al-Zn alloy by grain refinement

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Journal of Materials Science & Technology 2018年第2期34卷 265-276页

作者： Sang-hoon Kim Jong Un Lee Ye Jin Kim Jun ho Bae Bong sun You sung Hyuk Park School of Materials Science and Engineering Kyungpook National University Implementation Research Division Korea Institute of Materials Science

This study demonstrates that the precipitation behavior of 13-Mg17Al12 phase during aging and the resultant variation in hardness and mechanical properties of cast Mg-Al-Zn alloy are strongly dependent on initial grain size. Grain size reduction accelerates discontinuous precipitation at the early stage of aging treatment by increasing the area fraction of grain boundaries that can act as nucleation sites for discontinuous precipitates （DP）, but it does not influence DP growth rate. Grain refinement also prematurely terminates continuous precipitation because the formation of a large number of DP reduces the amount of AI dissolved in the matrix, which is required for the formation of continuous precipitates （CP）. This promotion of DP formation and early termination of CP formation significantly decrease the peak-aging time to one-third. The enhanced precipitation behavior also leads to an additional hardness improvement in the aged alloy, along with an increase in hardness owing to grain boundary strengthening by grain refinement. The amount of increase in hardness changes with aging time, which is determined by the variation of three variables with aging time： DP fraction difference between refined and nonrefined alloys, hardness difference between DP and matrix, and matrix hardness difference between the two alloys. Grain refinement improves both tensile strength and ductility of the homogenized alloy owing to grain boundary strengthening and suppression of twinning activation, respectively. however, the loss of ductility after peak-aging treatment is greater in the refined alloy because of the larger amount of DP acting as a crack source in this alloy.

关键词： Magnesium Grain refinement Aging Precipitation Tensile properties

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Preface to the Special Issue on Summer 2020:Record Rainfall in Asia—Mechanisms,Predictability and Impacts

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Advances in Atmospheric Sciences 2021年第12期38卷 1977-1979页

作者： Robin TCLARK Xiquan DONG Chang-hoi ho Jianhua sun Huiling YUAN Tetsuya TAKEMI Met Office Hadley Centre FitzRoy RoadExeter EX13PBUK Department of Hydrology and Atmospheric Sciences University of ArizonaTucsonAZ 857210011USA School of Earth and Environmental Sciences Seoul National UniversitySeoul 08826Korea Key Laboratory of Cloud-Precipitation Physics and Severe Storms(LACS) Institute of Atmospheric PhysicsChinese Academy of ScienceBeijing 100029China School of Atmospheric Sciences and Key Laboratory of Mesoscale Severe Weather/Ministry of Education Nanjing UniversityNanjing 210023China Disaster Prevention Research Institute Kyoto UniversityUji 611-0011Japan

Throughout vast areas of Asia,the summer of 2020 was extraordinarily *** an exceptionally wet May in Northeast India and Bangladesh,excessive rainfall hit at least 10 provinces in central and southern China in June and July,causing extensive flooding in many rural and urban *** standing rainfall,lake and river level records were consequently broken in several parts of the region with the Yangtze-Huaihe river valleys,particularly badly impacted,with consequential economic *** and landslides also affected parts of Japan with at least one location in Kumamoto province even experiencing a record-breaking 1000 mm of rainfall in just 3 days in early *** 2020 wet season in South Korea was also exceptionally long,lasting 54 days,compared to their more usual 32.

关键词： exceptional Northeast valley

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Temperature-induced Sn(Ⅱ) supramolecular isomeric frameworks as promising heterogeneous catalysts for cyanosilylation of aldehydes

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Science China Chemistry 2020年第2期63卷 182-186页

作者： Kai Sheng Li-Ming Fan Xue-Fei Tian Rakesh Kumar Gupta Linna Gao Chen-ho Tung Di sun Key Laboratory of Colloid and Interface Chemistry Ministry of EducationSchool of Chemistry and Chemical EngineeringState Key Laboratory of Crystal MaterialsShandong UniversityJinan 250100China School of Aeronautics Shandong Jiaotong UniversityJinan 250037China Department of Chemistry College of ScienceNorth University of ChinaTaiyuan 030051China College of Chemical and Environmental Engineering Shandong University of Science and TechnologyQingdao 266590China

Two novel Sn(Ⅱ) supramolecular isomeric frameworks,with the identical formula of {(NH2Me2)2[Sn(BDC)(SO4)]}n,Sn-CP-1-α(1) and Sn-CP-1-β(2)(H2BDC=terephthalic acid) were synthesized under solvothermal condition and fully characterized by single crystal X-ray diffraction(SCXRD),Fourier transform infrared spectroscopy(FTIR),ultraviolet-visible spectroscopy(UVVis),elemental analyses,and thermogravimetric analysis(TGA).Interestingly,the structures of 1 and 2 are governed by the temperature of the reaction,suggesting a temperature-induced supramolecular *** supramolecular isomers are primarily caused by the different bridging alignments of SO42–.Compounds 1 and 2 display 2 D layer and 3 D framework with different topologies,non-interpenetrated 44-sql and two-fold interpenetrated 4-connected dia topology,*** to Lewis acid properties of coordinatively unsaturated Sn(Ⅱ) sites in CPs,they have been utilized as heterogeneous catalyst for the cyanosilylation of aldehydes with an excellent conversion yield over 99% under solvent-free conditions.

关键词： supramolecular isomerism Sn(Ⅱ)coordination polymers catalysis cyanosilylation

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Collision tumor of hepatocellular carcinoma and neuroendocrine carcinoma involving the liver: Case report and review of the literature

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World Journal of Gastroenterology 2016年第41期22卷 9229-9234页

作者： Gyu ho Choi sun Young Ann Soon Il Lee Suk BaeKim Il Han Song Dankook University College of Medicine Cheonan 31116South Korea

Primary hepatic neuroendocrine carcinoma(NEC) with concurrent occurrence of hepatocellular carcinoma(HCC) of the liver is very rare. Only 8 cases have been reported in the literature. Concurrent occurrence of HCC and NEC in the liver is classified as combined type or collision type by histological distributional patterns; only 2 cases have been reported. Herein, we report a case of collision type concurrent occurrence of HCC and NEC, in which primary hepatic NEC was in only a small portion of the nodule, which is different from the 2 previously reported cases. A 72-year-old male with chronic hepatitis C was admitted to our hospital for a hepatic mass detected by liver computed tomography(CT) at another clinic. Because the nodule was in hepatic segment 3 and had proper radiologic findings for diagnosis of HCC, including enhancement in the arterial phase and wash-out in the portal and delay phases, the patient was treated with laparoscopic left lateral sectionectomy. The pathology demonstrated that the nodule was 2.5 cm and was moderately differentiated HCC. however, a 3 mm-sized focal neuroendocrine carcinoma was also detected on the capsule of the nodule. The tumor was concluded to be a collision type with HCC and primary hepatic NEC. After the surgery, for follow-up, the patient underwent a liver CT every 3 mo. Five multiple nodules were found in the right hepatic lobe on the follow-up liver CT 6 mo post-operatively. As the features of the nodules in the liver CT and MRI were different from that of HCC, a liver biopsy was performed. Intrahepatic recurrent NEC was proven after the liver biopsy, which showed the same pathologic features with the specimen obtained 6 mo ago. Palliative chemotherapy with a combination of etoposide and cisplatin has been administered for 4 months, showing partial response.

关键词： Collision tumor Hepatocellular carcinoma Neuroendocrine carcinoma Chronic hepatitis C

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Effects of entrance channel on fusion probability in hot fusion reactions

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Chinese Physics C 2016年第12期40卷 106-112页

作者： Long Zhu aun Su Ching-Yuan Huang Feng-shon Zhang Sino-French Institute of Nuclear Engineering and Technology Sun Yat-sen University Zhuhai 519082 China The Key Laboratory of Beam Technology and Material Modification of Ministry of Education College of Nuclear Science and Technology Beijing Normal University Beijing 100875 China Beijing Radiation Center Beijing 100875 China

Within the framework of the dinuclear system （DNS） model, the fusion reactions leading to the compound nuclei 274Hs＊ and 2S6Cn＊ are investigated. The fusion probability as a function of DNS excitation energy is studied. The calculated results are in good agreement with the available experimental data. The obtained results show that the fusion probabilities are obviously enhanced for the reactions located at high place in potential energy surface, although these reactions may have small values of mass asymmetry. It is found that the enhancement is due to the large potential energy of the initial DNS.

关键词： fusion probability entrance channel effects hot fusion reactions dinuclear system model

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Purtscher-like retinopathy with macular ischemia as the initial presentation of Behcet's disease

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International Journal of Ophthalmology(English edition) 2022年第3期15卷 520-522页

作者： Min ho Shin Woong sun Yoo Ji sung Jung In Young Chung Department of Ophthalmology Chosun University HospitalGwangju 61453Republic of Korea Department of Ophthalmology Gyeongsang National University HospitalJinju 52727Republic of Korea

Dear Editor,We would like to present a case report of Purtscher-like retinopathy (PLR) with macular ischemia as the initial presentation of Behcet’s disease (BD).

关键词： ischemia Behcet macular

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A novel 58-nuclei silver nanowheel encapsulating a subvalent Ag64+ kernel

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Science China Chemistry 2020年第1期63卷 16-20页

作者： Zhi Wang Qing-Ping Qu Hai-Feng Su Peng Huang Rakesh Kumar Gupta Qing-Yun Liu Chen-ho Tung Di sun Lan-sun Zheng Key Laboratory of Colloid and Interface Chemistry Ministry of EducationSchool of Chemistry and Chemical EngineeringState Key Laboratory of Crystal MaterialsShandong UniversityJinan 250100China Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials Department of ChemistrySchool of Chemistry and Chemical EngineeringJiangsu Normal UniversityXuzhou 221116China State Key Laboratory for Physical Chemistry of Solid Surfaces and Department of Chemistry College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China College of Chemical and Environmental Engineering Shandong University of Science and TechnologyQingdao 266590China

The combination of CrO4^2-anion and N,N′-dimethylformamide(DMF)-containing solvent helps to stabilize an atom-precise ultrasmall Ag6 kernel into a 52-nuclei silver shell,giving a core-shell Ag6@Ag52 wheel-like struct... 详细信息

关键词： silver cluster subvalent Ag6^4+kernel electrospray ionisation mass spectrometry(ESI-MS) photocurrent response

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