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High-power and long-life supercapacitive performance of hierarchical, 3-D urchin-like W18049 nanostructure electrodes

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Nano Research 2016年第3期9卷 633-643页

作者： Sangbaek Park Hyun-Woo Shim chan Woo Lee Hee Jo Song jae-chan kim Dong-Wan kim Department of Materials Science and Engineering Seoul National University Seoul 151-744 Republic of Korea School of Civil Environmental and Architectural Engineering Korea University Seou1136-713 Republic of Korea

We report the facile, one-pot synthesis of 3-D urchin-like W18O49 nanostructures （U-WO） via a simple solvothermal approach. An excellent supercapacitive performance was achieved by the U-WO because of its large Brunauer-Emmett- Teller （BET） specific surface area （ca. 123 m2.g-1） and unique morphological and structural features. The U-WO electrodes not only exhibit a high rate-capability with a specific capacitance （Csp） of -235 F·g-1 at a current density of 20 A.g-1, but also superior long-life performance for 1,000 cycles, and even up to 7,000 cycles, showing -176 F·g-1 at a high current density of 40 A.g-1.

关键词： hierarchical structure W18O49 high-power long cycle life supercapacitor

Tailoring uniform γ-MnO2 nanosheets on highly conductive three-dimensional current collectors for high-performance supercapacitor electrodes

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Nano Research 2015年第3期8卷 990-1004页

作者： Sangbaek Park Hyun-Woo Shim chan Woo Lee Hee Jo Song Ik jae Park jae-chan kim Kug Sun Hong Dong-Wan kim Department of Materials Science and Engineering Seoul National University Seou1151-744 R. O. Korea School of Civil Environmental and Architectural Engineering Korea University Seou1136-713 R. O. Korea

Recent efforts have focused on the fabrication and application of three- dimensional （3-D） nanoarchitecture electrodes, which can exhibit excellent electrochemical performance. Herein, a novel strategy towards the design and synthesis of size- and thickness-tunable two-dimensional （2-D） MnO2 nanosheets on highly conductive one-dimensional （l-D） backbone arrays has been developed via a facile, one-step enhanced chemical bath deposition （ECBD） method at a low temperature （-50 ℃）. Inclusion of an oxidizing agent, BrO3-, in the solution was crucial in controlling the heterogeneous nucleation and growth of the nanosheets, and in inducing the formation of the tailored and uniformly arranged nanosheet arrays. We fabricated supercapacitor devices based on 3-D MnO2 nanosheets with conductive Sb-doped SnO2 nanobelts as the backbone. They achieved a specific capacitance of 162 F·g-1 at an extremely high current density of 20 A·g% and good cycling stability that shows a capacitance retention of -92% of its initial value, along with a coulombic efficiency of almost 100% after 5,000 cycles in an aqueous solution of I M Na2SO4. The results were attributed to the unique hierarchical structures, which provided a short diffusion path of electrolyte ions by means of the 2-D sheets and direct electrical connections to the current collector by 1-D arrays as well as the prevention of aggregation by virtue of the well-aligned 3-D structure.

关键词： nanosheets manganese oxide chemical bath deposition SnO2 nanobelts supercapacitor

Iridium‑Cluster‑Implanted Ruthenium Phosphide Electrocatalyst for Hydrogen Evolution Reaction

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Advanced Fiber Materials 2024年第1期6卷 158-169页

作者： Kyounghoon Jung Dwi Sakti Aldianto Pratama Andi Haryanto Jin Il Jang Hyung Min kim jae‑chan kim chan Woo Lee Dong‑Wan kim School of Civil Environmentaland Architectural EngineeringKorea UniversitySeoul 02841Republic of Korea Department of Chemistry Kookmin UniversitySeoul 02707Republic of Korea Materials Science and Chemical Engineering Center Institute for Advanced EngineeringYongin‑si 17180Republic of Korea

Ruthenium phosphide is a promising catalyst for hydrogen evolution due to its cost-effectiveness compared to *** it faces the challenge of having a high binding energy for hydrogen *** this study,we demonstrate that the incorporation of iridium in ruthenium phosphides lowers the binding energy of hydrogen intermediates,thereby controlling the overpotential and Tafel slope of hydrogen *** the Ir content was doped at 3 at.%,the catalyst achieved an overpotential of 33 mV and a Tafel slope of 33 mV dec^(-1) under acidic conditions,which are similar to those of the benchmark Pt/C *** situ Raman spectroscopy and density functional theory(DFT)calculations suggest that the enhanced catalytic activity originates from the near-neutral Gibbs free energy of hydrogen adsorption on the hollow site of the iridium cluster implanted onto ruthenium phosphide.

关键词： Water electrolysis Ruthenium phosphide Iridium substitution Electronic structure Hydrogen evolution reaction Electrospinning

间充质干细胞移植参与和促进家兔角膜碱烧伤愈合的机理研究

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间充质干细胞移植参与和促进家兔角膜碱烧伤愈合的机理研究

间充质干细胞移植参与和促进家兔角膜碱烧伤愈合的机理研究

中华医学会第十二届全国眼科学术大会

作者：叶娟吴涵姚克 jae chan kim 浙江大学医学院附属第二医院眼科中心

目的：研究和证实全身血循环移植的间充质干细胞(MSCs) 能移行和聚集到碱烧伤的角膜并促进角膜愈合,探索干细胞移植治疗角膜病的可行性。方法：建立家兔角膜碱烧伤模

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间充质干细胞移植参与和促进家兔角膜碱烧伤愈合的机理研究

Regulation of sleep by astrocytes in the hypothalamic ventrolateral preoptic nucleus

2007年浙江省眼科学术会议

作者：叶娟吴涵姚克 jae chan kim 浙江大学医学院附属第二医院眼科中心韩国中央大学眼科中心

目的：研究和证实全身血循环移植的间充质干细胞(MSCs)能移行和聚集到碱烧伤的角膜并促进角膜愈合,探索干细胞移植治疗角膜病的可行性。方法：建立家兔角膜碱烧伤模型。实验家兔分为四组：组一,正常骨髓功能,不接受 MSCs 移植;组二,正... 详细信息

目的：研究和证实全身血循环移植的间充质干细胞(MSCs)能移行和聚集到碱烧伤的角膜并促进角膜愈合,探索干细胞移植治疗角膜病的可行性。方法：建立家兔角膜碱烧伤模型。实验家兔分为四组：组一,正常骨髓功能,不接受 MSCs 移植;组二,正常骨髓功能,接受 MSCs 移植;组三,环磷酰胺抑制骨髓功能,不接受 MSCs 移植;组四,环磷酰胺抑制骨髓功能,接受 MSCs 移植;临床评估包括角膜上皮修复程度,角膜混浊程度和新生血管化程度。干细胞的增殖分化通过免疫组化检测细胞增殖核抗原(PCNA),P63,Vimentin,α-SMA 来评估,并即时监控移植细胞的移行情况。结果：随访1个月, 组二家兔临床恢复最快,角膜混浊程度明显降低,角膜烧伤14天后出现新生血管,并且角膜组织明显表达 PCNA．P63,Vimentin。DiI 标记的 MSCs 大量聚集在创伤角膜中并表达α-SMA。组三和组四家兔表现的极少的移植细胞在创伤角膜聚集,新生血管增殖缓慢和角膜愈合不良。结论：全身血循环移植的 MSCs 能移行和聚集到碱烧伤的角膜并通过增殖分化后促进角膜愈合,MSCs 的功能依赖正常骨髓微环境和造血干细胞的协同作用。

关键词：角膜碱烧伤干细胞

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Neural Regeneration Research 2025年第4期20卷 1098-1100页

作者： jae-Hong kim Ruqayya Afridi Il-Sung Jang Maan Gee Lee Kyoungho Suk Brain Korea 21 four KNU Convergence Educational Program of Biomedical Sciences for Creative Future Talents School of MedicineKyungpook National UniversityDaeguRepublic of Korea Department of Pharmacology School of MedicineKyungpook National UniversityDaeguRepublic of Korea Department of Pharmacology School of DentistryKyungpook National UniversityDaeguRepublic of Korea Brain Science&Engineering Institute Kyungpook National UniversityDaeguRepublic of Korea

Astrocytes are functionally dynamic cells that support neurons in multiple ways throughout an organism’s *** astrocytic regulation of neuronal activity has been increasingly recognized in recent *** are now recognized as playing a more complex role than mere bystanders in the central nervous ***,their role in regulating the sleep neurocircuitry is not well *** this perspective,we highlight the role of astrocytes in sleep modulation,with a particular focus on regulatory mechanisms related to the ventrolateral preoptic nucleus(VLPO)of the *** briefly discuss recent literature reporting the role of VLPO astrocytes in regulating sleep-associated behaviors.

关键词： sleep ventrolateral astrocytes

Tetradentate Pt(Ⅱ)complex as a singlet exciton sensitizing host for highly efficient green fluorescent organic light-emitting diodes

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Science China Materials 2024年第8期67卷 2618-2627页

作者： Unhyeok Jo Seung chan kim chan Hee Ryu Kang Mun Lee jae-Min kim Jun Yeob Lee School of Chemical Engineering Sungkyunkwan University2066Seobu-roJangan-guSuwon-siGyeonggi-do 16419Republic of Korea Department of Chemistry Institute for Molecular Science and Fusion TechnologyKangwon National UniversityChuncheonGangwon 24341Republic of Korea Department of Advanced Materials Engineering Chung-Ang University4726Seodong-daeroDaedeok-myeonAnseong-siGyeonggi-do 17546Republic of Korea SKKU Advanced Institute of Nano Technology Sungkyunkwan University2066Seobu-roJangan-guSuwonGyeonggi 16419Republic of Korea SKKU Institute of Energy Science and Technology Sungkyunkwan University2066Seobu-roJangan-guSuwonGyeonggi 16419Republic of Korea

Efficient green fluorescent organic light-emitting diodes were designed with a phosphorescent metal complex as a singlet exciton sensitizing host(SESH)for achieving high efficiency and low efficiency roll-off through exciton and polaron *** Pt(Ⅱ)complex(Pt-Trz)possessing a tetradentate ligand with a bulky blocking group not only suppresses the severe formation of excimer or dimer itself but also transfers radiative excitons to fluorescent dopant *** SESH assisted fluorescence(SESHF)device with Pt-Trz as the host exhibits the maximum external quantum efficiency of 13.3%and a lower efficiency roll-off compared with exciplex host device which is a general approach for harvesting triplet *** exciton dynamics modeling unravels that the SESHF device effectively utilizes triplet excitons in the host by intersystem crossing and resonance energy transfer from the triplet state of the host to the singlet state of the terminal *** quenching rates of the SESHF device are reduced by 11 times for triplet-triplet annihilation and 1.8 times for tripletpolaron annihilation compared with the exciplex device,which demonstrates that Pt-Trz could be a platform to be used as an efficient host for fluorophores.

关键词： singlet annihilation polaron

Stabilizing lithium deposition within bimodal porous SiO_(2)-TiO_(2) microspheres as 3D host structure

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Nano Research 2024年第11期17卷 10179-10188页

作者： Noeul kim jae Hun Choi Min kim Dae Soo Jung Yun chan Kang Department of Materials Science and Engineering Korea University Anam-Dong Seongbuk-Gu Seoul 136-713 Republic of Korea Energy Storage Materials Center Korea Institute of Ceramic Engineering and Technology Soho-ro Jinju-si Gyeongnam-do 52851 Republic of Korea

Three-dimensional (3D) host materials for lithium metal anodes (LMAs) have gained attention because they can mitigate volume expansion and local current density through their large surface area and suppress the dendritic growth of lithium. Recent research on 3D host materials has focused on conductive materials;however, the benefits of 3D host materials cannot be fully utilized because lithium deposition begins at the top of the structure. Herein, we fabricate SiO_(2)-TiO_(2) composite microspheres with bimodal pore structures (bi-SiTiO) by simple spray pyrolysis. These microspheres effectively store lithium within the structure from the bottom of the electrode while preventing lithium dendrite formation. Focused ion beam-scanning transmission electron microscopy (FIB-STEM) analysis reveals that the lithiophilic properties of composite microspheres enhanced their effectiveness in storing lithium, with small pores acting as “lithium-ion sieves” for a uniform lithium-ion flux and large pores that provide sufficient volume for lithium deposition. The bi-SiTiO composite microspheres exhibit a high Coulombic efficiency of 98.5% over 200 cycles at 2.0 mA·cm^(−2) when operated in a lithium half-cell. With a high lithium loading of 5.0 mAh·cm^(−2), the symmetrical cell of the bi-SiTiO electrode sustains more than 900 h. A full cell coupled with an LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2) (NCM811) cathode also exhibits enhanced electrochemical properties in terms of cycling stability and rate capability.

关键词： lithium metal battery spray pyrolysis three-dimensional(3D)host materials bimodal pore structure lithiophilic materials

Protective Effect of 10-Hz,1-mT Electromagnetic Field Exposure Against Hypoxia/Reoxygenation Injury in HK-2 Cells

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Biomedical and Environmental Sciences 2015年第3期28卷 231-234页

作者： Soonho Lim Soo-chan kim jae Young kim Department of Biological Science Gachon University Department of Electrical and Electronic Engineering Hankyong National University

We investigated the protective effects of electromagnetic field（EMF）on the survival of the human renal proximal tubular cell line,HK-2,using an in vitro hypoxia/reoxygenation（H/R）injury *** survival rate of cells cultured under H/R condition declined significantly,while the intracellular reactive oxygen species（ROS）levels markedly *** 10 Hz/1 m T EMF exposure could inhibit H/R-induced cell death of HK-Z via suppression of intracellular ROS production and that this treatment might be clinically useful for the amelioration of renal ischemia/reperfusion injury.

关键词： proximal protective declined exposure intracellular cultured tubular exposed markedly suppression