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Effects of structure and electronic properties of D-π-A organic dyes on photovoltaic performance of dye-sensitized solar cells

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Journal of Energy Chemistry 2021年第3期30卷 208-216页

作者： Min-Woo lee Jae-Yup Kim hyung-Geun lee Hyun Gil Cha Duck-hyung lee Min Jae Ko Bio-Based Chemistry Research Center Advanced Convergent Chemistry DivisionKorea Research Institute of Chemical Technology(KRICT)Ulsan 44429Republic of Korea Department of Chemical Engineering Dankook UniversityYongin 16890Republic of Korea Department of Chemistry Sogang UniversitySeoul 04107Republic of Korea Department of Chemical Engineering Hanyang UniversitySeoul 04763Republic of Korea Institute of Nano Science and Technology Hanyang UniversitySeoul 04763Republic of Korea

Herein,we examine the performance of dye-sensitized solar cells containing five D-π-A organic dyes designed by systematic modification of π-bridge size and geometric *** dye has a simple push-pull structure with a triarylamino group as an electron donor,bithiophene-4,4-dimethyl-4 H-cyclopenta 1,2-b:5,4-b’]dithiophene(M11),4,4-dimethyl-4 H-cyclopenta[1,2-b:5,4-b’]dithiophenethiophene(M12),thiophene-4,4-dimethyl-4 H-cyclopenta[1,2-b:5,4-b’]dithiophene(M13),4,4-dimethyl-4 H-cyclopenta[1,2-b:5,4-b’]dithiophene-benzene(M14),and 4,4-dimethyl-4 H-cyclopenta[1,2-b:5,4-b’]dithiophene(M15)units asπ-bridges,and cyanoacrylic acid as an electron acceptor/*** extension of theπ-bridge linkage favors wide-range absorption but,because of the concomitant molecular volume increase,hinders the efficient adsorption of dyes on the TiO_(2) film ***,higher loadings are achieved for smaller dye molecules,resulting in(i)a shift of the TiO_(2) conduction band edge to more negative values,(ii)a greater photocurrent,and(iii)suppressed charge recombination between the photoanode and the redox couple in the ***,under one-sun equivalent illumination(AM 1.5 G,100 mW/cm^(2)),the highest photovoltage,photocurrent,and conversion efficiency(η=7.19%)are observed for M15,which has the smallest molecular volume among M series dyes.

关键词： Dye-sensitized solar cells Donor-acceptor dyes Electron-rich unit Wide-range absorption Impedance spectroscopy

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Effects of Cr doping on structural and electrochemical properties of Li_(4)Ti_(5)O_(12) nanostructure for sodium-ion battery anode

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Journal of Energy Chemistry 2021年第8期30卷 465-472,I0010页

作者： Sang Hyuk Gong Ji Hyeon lee Dong Won Chun Jee-Hwan Bae Sung-chul Kim Seungho Yu Sahn Nahm hyung-Seok Kim Center for Energy Storage Research Korea Institute of Science and Technology5Hwarang-ro 14-gilSeongbuk-gu02792 SeoulRepublic of Korea Department of Materials Science and Engineering Korea University145Anam-roSeongbuk-gu02841 SeoulRepublic of Korea Department of Chemical and Biological Engineering Korea University145Anam-roSeongbuk-gu02841 SeoulRepublic of Korea Advanced Analysis Center Korea Institute of Science and Technology5Hwarang-ro 14-gilSeongbuk-gu02792 SeoulRepublic of Korea

Sodium-ion batteries are considered as promising alternatives to lithium-ion batteries,owing to their low cost and abundant raw *** the several candidate materials for the anode,spinel-type Li_(4)Ti_(5)O_(12)has potential owing to its superior safety originating from an appropriate operating voltage and the reversible Na^(+)intercalation ***,a low diffusion coefficient for Na^(+)and the insulating nature of LTO remains challenging for practical sodium-ion battery ***,we present a strategy for integrating physical and chemical approaches to achieve superior electrochemical properties in *** demonstrate that carefully controlling the amount of Cr doping is crucial to enhance the electrochemical properties of nanostructured *** Cr doped LTO shows a superior reversible capacity of 110 m Ah g^(-1) after 400 cycles at 1 C,with a three-fold higher capacity(75 m Ah g^(-1))at 10 C compared with undoped LTO *** suggests that appropriately Cr doped nanostructured LTO is a promising anode material for sodium-ion batteries.

关键词： Sodium-ion batteries Spinel type Li_(4)Ti_(5)O_(12) Anode materials Nanostructuring Cr-doping

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Liver function alterations after laparoscopy-assisted gastrectomy for gastric cancer and its clinical significance

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World Journal of Gastroenterology 2011年第3期17卷 372-378页

作者： Gui-Ae Jeong Gyu-Seok Cho Eung-Jin Shin Moon-Soo lee hyung-chul Kim Ok-Pyung Song Department of Surgery Soonchunhyang University College of Medicine

AIM: To evaluate the factors associated with liver function alterations after laparoscopy-assisted gastrectomy (LAG) for gastric cancer. METHODS: We collected the data of gastrectomy patients with gastric cancer and divided them into 2 groups: open gastrectomy (OG) and LAG. We also collected the data of patients with colon cancer to evaluate the effect of liver manipulations during surgery on liver function alterations. Serum aspartate aminotransferase (AST), alanine aminotransferase (ALT), total bilirubin, and alkaline phosphatase were measured on the preoperative day and postoperative day 1 (POD1), POD3, POD5, and POD7. RESULTS: No changes in liver function were observed after the operation in patients with colon cancer (n = 121). However, in gastric cancer patients (n = 215), AST and ALT levels increased until POD5 compared to those in colon cancer patients and these findings were observed both in the LAG and OG without a significant difference except at POD1. The mean hepatic enzyme levels at POD1 in the LAG group were significantly higher than those in the OG group (P = 0.047 for AST and P = 0.039 for ALT). The factors associated with elevated ALT on POD1 in patients with gastric cancer were body mass index (P < 0.001), operation time (P < 0.001), intraoperative hepatic injury (P = 0.048), and ligation of an aberrant left hepatic artery (P = 0.052) but not type of operation (OG vs LAG, P = 0.094). CONCLUSION: We conclude that the liver function alteration after LAG may have been caused by direct liver manipulation or aberrant hepatic artery ligation rather than the CO2 pneumoperitoneum.

关键词： Gastric cancer Liver function Pneumoperitoneum Laparoscopy-assisted gastrectomy

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Safety assessment of condensed phosphate intake from fishery and processed marine food products in Korea with respect to gender,age,and region

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Food Quality and Safety 2021年第2期5卷 161-169页

作者： hyung Soo Kim Dae Yong Jang Ye Ji Koo Eun chul Pack Seung Ha lee Dal Woong Choi Health Science Research Center Korea UniversitySeoulRepublic of Korea department of Public Health Sciences Graduate SchoolKorea UniversitySeoulRepublic of Korea School of Health and Environmental Sciences Korea UniversitySeoulRepublic of Korea and department of Health and Safety Convergence Science Graduate SchoolKorea UniversitySeoulRepublic of Korea.

Condensed phosphates are used as food additives,especially in marine products and meat,to improve food *** import and consumption of fishery and processed marine food products in Republic of Korea have reportedly increased by~5 per cent ***,processed marine food products are often intentionally adulterated with excessive amounts of condensed phosphates to increase their *** intake of condensed phosphates via consuming processed marine food products can lead to various adverse effects on human health due to anionic ***,we conducted a safety assessment of condensed phosphates in 14 types of fishery and processed marine food products in Korea for the first *** analysis of various factors including gender,age,and region was also performed,and the risk level of exposure for each group was *** assessments by age and gender indicated that infants were at the highest *** the regional safety assessment,Chungnam,the most inland region,showed the lowest *** both the general and the high-intake groups(95th percentile)in all classifications,the risk was lower(<20 per cent)than the international standard,and the phosphorus content of the 14 types of processed marine products in Korea was confirmed to be safe for human consumption.

关键词： Condensed phosphates safety assessment ion chromatography fishery and processed marine food products

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Characteristics of contaminants in water and sediment of a constructed wetland treating piggery wastewater effluent

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Journal of Environmental Sciences 2010年第6期22卷 940-945页

作者： Soyoung lee Marla C.Maniquiz lee-hyung Kim Department of Civil & Environment Engineering Kongju National University

Constructed wetland （CW） is the preferred means of controlling water quality because of its natural treatment mechanisms and function as a secondary or tertiary treatment unit. CW is increasingly applied in Korea for secondary effluent of livestock wastewater treatment. This study was conducted to recognize the characteristics of contaminants in the accumulated sediment at the bottom soil layer and to reduce the phosphorus release from sediments of the free water surface CW for the treatment of secondary piggery wastewater effluent from a livestock wastewater treatment facility. The results revealed that the dominant phosphorus existence types at near the inlet of the CW were non-apatite phosphorus （59%） and residual phosphorus （32%） suggesting that most of the particles of the influent are made up of inorganic materials and dead cells. Sediment accumulation is important when determining the long-term maintenance requirements over the lifetime of CW. Continuous monitoring will be performed for a further assessment of the CW system and design.

关键词： constructed free water surface wetland piggery wastewater phosphorus type secondary wastewater effluent sediment

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Difficulties, strategies, and recent research and development of layered sodium transition metal oxide cathode materials for high-energy sodium-ion batteries

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Journal of Energy Chemistry 2024年第3期90卷 40-57,I0003页

作者： Kouthaman Mathiyalagan Dongwoo Shin Young-chul lee Department of Nano Science and Technology Convergence Gachon University1342 Seongnam-DaeroSujeong-GuGyeonggi-DoSeongnam-Si 13120Republic of Korea Department of Bio Nano Technology Gachon University1342 Seongnam-DaeroSujeong-GuGyeonggi-DoSeongnam-Si 13120Republic of Korea

Energy-storage systems and their production have attracted significant interest for practical *** are the foundation of sustainable energy sources for electric vehicles(EVs),portable electronic devices(PEDs),*** recent decades,Lithium-ion batteries(LIBs) have been extensively utilized in largescale energy storage devices owing to their long cycle life and high energy ***,the high cost and limited availability of Li are the two main obstacles for *** this regard,sodium-ion batteries(SIBs) are attractive alternatives to LIBs for large-scale energy storage systems because of the abundance and low cost of sodium *** is one of the most important components in the battery,which limits cost and performance of a *** the classified cathode structures,layered structure materials have attracted attention because of their high ionic conductivity,fast diffusion rate,and high specific ***,we present a comprehensive review of the classification of layered structures and the preparation of layered ***,the review article discusses extensively about the issues of the layered materials,namely(1) electrochemical degradation,(2) irreversible structural changes,and(3) structural instability,and also it provides strategies to overcome the issues such as elemental phase composition,a small amount of elemental doping,structural design,and surface alteration for emerging *** addition,the article discusses about the recent research development on layered unary,binary,ternary,quaternary,quinary,and senary-based O3-and P2-type cathode materials for high-energy *** review article provides useful information for the development of high-energy layered sodium transition metal oxide P2 and O3-cathode materials for practical SIBs.

关键词： O3-type P2-type Cathode materials Sodium-ion batteries Layered structure

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Multiple linear regression models of urban runoff pollutant load and event mean concentration considering rainfall variables

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Journal of Environmental Sciences 2010年第6期22卷 946-952页

作者： Marla C.Maniquiz Soyoung lee lee-hyung Kim Department of Civil & Environmental Engineering Kongju National University

Rainfall is an important factor in estimating the event mean concentration （EMC） which is used to quantify the washed-off pollutant concentrations from non-point sources （NPSs）. Pollutant loads could also be calculated using rainfall, catchment area and runoff coefficient. In this study, runoff quantity and quality data gathered from a 28-month monitoring conducted on the road and parking lot sites in Korea were evaluated using multiple linear regression （MLR） to develop equations for estimating pollutant loads and EMCs as a function of rainfall variables. The results revealed that total event rainfall and average rainfall intensity are possible predictors of pollutant loads. Overall, the models are indicators of the high uncertainties of NPSs; perhaps estimation of EMCs and loads could be accurately obtained by means of water quality sampling or a long term monitoring is needed to gather more data that can be used for the development of estimation models.

关键词： event mean concentration (EMC) multiple linear regression model load non-point sources rainfall urban runoff

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A Stochastic Galerkin Method for Stochastic Control Problems

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Communications in Computational Physics 2013年第6期14卷 77-106页

作者： hyung-Chun lee Jangwoon lee Department of Mathematics Ajou UniversitySuwonKorea 443-749 Department of Mathematics University of Mary WashingtonFredericksburgVA 22401USA

In an interdisciplinary field on mathematics and physics,we examine a physical problem,fluid flow in porous media,which is represented by a stochastic partial differential equation(SPDE).We first give a priori error estimates for the solutions to an optimization problem constrained by the physical model under lower regularity assumptions than the *** then use the concept of Galerkin finite element methods to establish a new numerical algorithm to give approximations for our stochastic optimal physical ***,we develop original computer programs based on the algorithm and use several numerical examples of various situations to see how well our solver works by comparing its outputs to the priori error estimates.

关键词： Stochastic Galerkin methods stochastic partial differential equation distributed control finite element methods

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Enzyme-amplified SERS immunoassay with Ag-Au bimetallic SERS hot spots

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Nano Research 2020年第12期13卷 3338-3346页

作者： Xuan-Hung Pham Eunil Hahm Tae Han Kim hyung-Mo Kim Sang Hun lee Sang chul lee Homan Kang Ho-Young lee Dae Hong Jeong Hak Soo Choi Bong-Hyun Jun Department of Bioscience and Biotechnology Konkuk UniversitySeoul143-701Republic of Korea Department of Nuclear Medicine Seoul National University Bundang HospitalSeongnam13620Republic of Korea Gordon Center for Medical Imaging Department of RadiologyMassachusetts General Hospital and Harvard Medical SchoolBostonMA02114USA Department of Chemistry Education Seoul National UniversitySeoul151-742Republic of Korea

Surface-enhanced Raman scattering(SERS)enables rapid detection of single molecules with high ***,quantitative and sensitive SERS analysis has been a challenge due to the lack of reliable SERS-active *** this study,we developed a quantitative SERS-based immunoassay using enzyme-guided Ag growth on Raman labeling compound(RLC)-immobilized gold nanoparticle(Au NP)-assembled silica NPs(SiO2@Au-RLC@Ag).The enzyme amplified Ag+reduction as well as Ag growth on the RLC-immobilized Au NP-assembled silica NPs(SiO2@Au-RLC),which resulted in a significant increase in SERS *** the presence of target antigens such as immunoglobulinG(IgG)or prostate-specific antigen(PSA),Ab1-Antigen-Ab2 immune complex with alkaline phosphatase triggered an enzyme-catalyzed reaction to convert 2-phospho-L-ascorbic acid(2-phospho-L-AA)to ascorbic acid(AA).As produced AA reduced Ag+to Ag,forming an Ag hot spot on the surface of SiO2@Au-RLC,which enhanced the SERS signal of SiO2@Au-RLC@Ag in a solution with a target antigen *** plasmonic immunoassay for IgG detection showed a high linearity of SERS intensity in the range of 0.6 to 9.0 ng/mL with a detection limit(LOD)of 0.09 ng/mL,while an LOD of 0.006 ng/mL was obtained for *** results indicate that the sensitivity of our novel SERS-based immunoassay is higher than that of conventional enzyme-based colorimetric immunoassays.

关键词： surface-enhanced Raman scattering(SERS)-based immunoassay Au-Ag alloy surface-enhanced Raman scattering silica template immunoglobulin G(IgG)detection

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Adhesion and Suction Functions of the Tip Region of a Nectar-drinking Butterfly Proboscis

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Journal of Bionic Engineering 2017年第4期14卷 600-606页

作者： Seung chul lee Jun Ho Kim Sang Joon lee Department of Mechanical Engineering Pohang University of Science and Technology Pohang 37673 Gyeongbuk Republic of Korea Center for Biofluid and Biomimic Research Pohang University of Science and Technology Pohang 37673 Gyeongbuk Republic of Korea

In this study, we investigated the dynamic functions of the tip region of the butterfly proboscis through which liquid is sucked during liquid feeding. The microstructures and flow patterns in the tip region of the proboscis were in vivo analyzed. The tip region can be divided into two functional sections： namely adhesion and suction sections. The liquid adheres to the adhesion section during liquid suction. Although the tip region has numerous slits connected to food canal of the proboscis, liquid is mainly sucked through the suction section, which section is submerged in the fluid pulled by the adhesion section and then successfully imbibes liquid. To check the dynamic functions of the tip region, we fabricated a suction tip model having adhesion and suction parts. The in vitro model experiments show that the hydrophilicity of the adhesion part and the existence of the suction inlet improve the liquid uptake driven by a suction pump. This study may provide insights for the biomimetic design of nectar-feeding butterflies.

关键词： butterfly proboscis nectar-feeding strategy suction

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