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Enhancement of vertical phase separation in sequentially deposited organic photovoltaics through the independent processing of additives

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Journal of Energy Chemistry 2024年第7期94卷 768-777页

作者： Damin Lee Changwoo Park Gayoung Ham Young Yong kim Sung-Nam Kwon Junyeong Lee sungjin Jo Seok-In Na Hyojung Cha Department of Hydrogen and Renewable Energy Kyungpook National UniversityDaegu 41566Republic of Korea Department of Energy Convergence and Climate Change Kyungpook National UniversityDaegu 41566Republic of Korea Pohang Accelerator Laboratory(PAL) Pohang University of Science and Technology(POSTECH)PohangGyeongbuk 37673Republic of Korea Department of Flexible and Printable Electronics Jeonbuk National UniversityJeonju-siJeollabuk-do 54896Republic of Korea School of Energy Engineering Kyungpook National UniversityDaegu 41566Republic of Korea

Herein,the impact of the independent control of processing additives on vertical phase separation in sequentially deposited (SD) organic photovoltaics (OPVs) and its subsequent effects on charge carrier kinetics at the electron donor-acceptor interface are *** film morphology exhibits notable variations,significantly depending on the layer to which 1,8-diiodooctane (DIO) was *** incidence wide-angle X-ray scattering analysis reveals distinctly separated donor/acceptor phases and vertical crystallinity details in SD ***-of-flight secondary ion mass spectrometry analysis is employed to obtain component distributions in diverse vertical phase structures of SD films depending on additive *** addition,nanosecond transient absorption spectroscopy shows that DIO control significantly affects the dynamics of separated charges in SD *** SD OPVs,DIO appears to act through distinct mechanisms with minimal restriction,depending on the applied *** study emphasizes the significance of morphological optimization in improving device performance and underscores the importance of independent additive control in the advancement of OPV technology.

关键词： Sequential deposition Vertical phase separation Charge dynamics Organic photovoltaics Nonfullerene acceptors

Phase-pure Na3V2(PO4)2F3 embedded in carbon matrix through a facile polyol synthesis as a potential cathode for high performance sodium-ion batteries

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Nano Research 2019年第4期12卷 911-917页

作者： Sohyun Park Jinju Song Seyeon kim Balaji Sambandam Vinod Mathew sungjin kim Jeonggeun Jo Seokhun kim Jaekook kim Department of Materials Science and Engineering Chonnam National University 300 Ybngbong-dong Buk-gu Gwangju 500-757 Republic of Korea Gwangju Bio/Energy R&D Center Korea Institute of Energy Research (KIER) 270-25 Samso-ro Buk-gu Gwangju 61003 Republic of Korea

In this study,a pseudo-layered Na super-ionic conductor of Na3V2(PO4)2F3 (NVPF)/C cathode for sodium-ion batteries is prepared successfully using a facile polyol refluxing process without any impurity *** X-ray diffraction and Rietveld refinement results confirm that NVPF possesses tetragonal NASICON-type lattice with a space group of P42/*** this preparative method,polyol is utilized as a solvent as well as a carbon *** presence of nanosized NVPF particles in the carbon network is confirmed by field-emission scanning electron microscopy (FE-SEM) and high-resolution transmission electron microscopy (HR-TEM).The existence of carbon is analyzed by Raman scattering and elemental *** applied as a Na-storage material in a potential window of 2.0-4.3 V,the electrode exhibits two flat voltage plateaus at 3.7 and 4.2 V with an electrochemically active V^3+/V^4+ redox *** addition,Na3V2(PO4)2F3/C composite achieved a retention capacity of ~ 88% even after 1,500 cycles at 15 ***,at high current densities of 30 and 50 C,Na3V2(PO4)2F3/C cathode retains the specific discharge capacities of 108.4 and 105.9 mAh·g-1,respectively,revealing the structural stability of the material prepared through a facile polyol refluxing method.

关键词： fluorophosphate Na3V2(PO4)2F3 polyol process sodium ion batteries long life stability

High and low frequency relaxation oscillations in a capacitive discharge plasma

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Chinese Physics B 2008年第10期17卷 3799-3806页

作者：周筑文 sungjin kim 吉世印孙光宇邓明森 Department of physics Guizhou Educational College Department of Electrical Engineering and Computer Sciences - 1770 University of California

Both high and low frequency relaxation oscillations have been observed in an argon capacitive discharge connected to a peripheral grounded chamber through a slot with dielectric spacers. The oscillations, observed from time-varying optical emission of the main discharge chamber, show, for example, a high frequency （46 kHz） relaxation oscillation at 100 mTorr, with an absorbed power near the peripheral breakdown, and a low frequency （2.7-3.7 Hz） oscillation, at a higher absorbed power. The high frequency oscillation is found to ignite a plasma in the slot, but usually not in the periphery. The high frequency oscillation is interpreted by using an electromagnetic model of the slot impedance, combined with the circuit analysis of the system including a matching network. The model is further developed by using a parallel connection of variable peripheral capacitance to analyse the low frequency oscillation. The results obtained from the model are in agreement with the experimental observations and indicate that a variety of behaviours are dependent on the matching conditions.

关键词： relaxation oscillation capacitive discharge periphery slot

Metal organic framework-combustion: A one-pot strategy to NiO nanoparticles with excellent anode properties for lithium ion batteries

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Journal of Energy Chemistry 2018年第1期27卷 300-305页

作者： Vaiyapuri Soundharrajan Balaji Sambandam Jinju Song sungjin kim Jeonggeun Jo Pham Tung Duong Seokhun kim Vinod Mathew Jaekook kim Department of Materials Science and Engineering Chonnam National University

NiO nanoparticles with average particles size of 30 nm are synthesized using a one-pot metal–organic framework-combustion（MOF-C） technique, for use as an anode material in rechargeable lithium ion batteries（LIBs）. The structural and electronic properties of these nanoparticles are studied using various techniques, including powder X-ray diffraction（PXRD）, transmission electron microscopy（TEM）, scanning electron microscopy（SEM）, X-ray photoelectron spectroscopy（XPS）, and N_2 adsorption/desorption studies. The as-synthesized NiO nanoparticles sustained reversible stable capacities of 748 and 410 mAh/g at applied current densities of 500 and 1000 m A/g, respectively, after 100 cycles. Furthermore, the anode displays a notable rate capability, achieving a stable capacity of ~200 mAh/g at a high current density of10 A/g. These results indicate that the size of the NiO nanoparticles and their high surface area influence their electrochemical properties. Specifically, this combustion strategy is clearly favorable for improving the cyclability and rate capability of various metal oxides in rechargeable battery electrodes.

关键词： Metal-organic frameworks Combustion NiO nanoparticles Lithium ion batteries High rate capability

Low-Frequency Relaxation Oscillations in Capacitive Discharge Processes

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Chinese Physics Letters 2008年第2期25卷 707-710页

作者：周筑文 M. A. LIEBERMAN sungjin kim 吉世印邓明森孙光宇 Department of Physics Guizhou Educational College Guiyang 550003 Department of Electrical Engineering and Computer Sciences-1770 University of California Berkeley CA 94720 USA

Low-frequency （2.72-3.70 Hz） relaxation oscillations at 100 mTorr at higher absorbed power were observed from time-varying optical emission of the main discharge chamber and the periphery. We interpret the low frequency oscillations using an electromagnetic model of the slot impedance with parallel connection variational peripheral capacitance, coupled to a circuit analysis of the system including the matching network. The model results are in general agreement with the experimental observations, and indicate a variety of behaviours dependent on the matching conditions.

关键词： pulsars x-ray spectra relativity and gravitation redshift

Carbon-coated manganese dioxide nanoparticles and their enhanced electrochemical properties for zinc-ion battery applications

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Journal of Energy Chemistry 2017年第4期26卷 815-819页

作者： Saiful Islam Muhammad Hilmy Alfaruqi Jinju Song sungjin kim Duong Tung Pham Jeonggeun Jo Seokhun kim Vinod Mathew Joseph Paul Baboo Zhiliang Xiu Jaekook kim Department of Materials Science and Engineering Chonnam National University300 Yongbong-dongBukguGwangju 61186Republic of Korea

In this study, we report the cost-effective and simple synthesis of carbon-coated α-MnOnanoparticles(α-MnO@C) for use as cathodes of aqueous zinc-ion batteries(ZIBs) for the first time. α-MnO@C was prepared via a gel formation, using maleic acid(CHO) as the carbon source, followed by annealing at low temperature of 270 °C. A uniform carbon network among the α-MnOnanoparticles was observed by transmission electron microscopy. When tested in a zinc cell, the α-MnO@C exhibited a high initial discharge capacity of 272 m Ah/g under 66 m A/g current density compared to 213 m Ah/g, at the same current density, displayed by the pristine sample. Further, α-MnO@C demonstrated superior cycleability compared to the pristine samples. This study may pave the way for the utilizing carbon-coated MnOelectrodes for aqueous ZIB applications and thereby contribute to realizing high performance eco-friendly batteries.

关键词： Carbon coating Manganese dioxide Zinc-ion battery Electrochemical properties

Chemotherapy predictors and a time-dependent chemotherapy effect in metastatic esophageal cancer

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World Journal of Gastrointestinal Oncology 2022年第2期14卷 511-524页

作者： Lauren Midthun sungjin kim Andrew Hendifar Arsen Osipov Samuel J Klempner Joseph Chao May Cho Michelle Guan Veronica R Placencio-Hickok Alexandra Gangi Miguel Burch De-Chen Lin Kevin Waters Katelyn Atkins Mitchell Kamrava Jun Gong Department of Medicine Division of Hematology and OncologyCedars-Sinai Medical CenterLos AngelesCA 90048United States Biostatistics and Bioinformatics Research Center Cedars Sinai Medical CenterLos AngelesCA 90048United States Samuel Oschin Cancer Center Cedars-Sinai Medical CenterLos AngelesCA 90048United States Department of Medicine Beth Israel Deaconess Medical Center/Harvard Medical SchoolBrigham and Women's Hospital/Harvard Medical SchoolBostonMA 02114United States Department of Medical Oncology and Therapeutics Research City of Hope Comprehensive Cancer CenterDuarteCA 91010United States Division of Hematology and Oncology Department of MedicineUniversity of CaliforniaIrvineCA 92697United States Department of Medicine Cedars Sinai Medical CenterLos AngelesCA 90048United States Department of Surgery Cedars-Sinai Medical CenterLos AngelesCA 90048United States Department of Pathology and Laboratory Medicine Cedars Sinai Medical CenterLos AngelesCA 90048United States Department of Radiation Oncology Cedars Sinai Medical CenterLos AngelesCA 90048United States Department of Radiation Oncology Cedars-Sinai Medical CenterLos AngelesCA 90048United States

BACKGROUND Chemotherapy has long been shown to confer a survival benefit in patients with metastatic esophageal ***,not all patients with metastatic disease receive *** To evaluate a large cancer database of metastatic esophageal cancer cases to identify predictors of receipt to chemotherapy and *** We interrogated the National Cancer Database(NCDB)between 2004-2015 and included patients with M1 disease who had received or did not receive chemotherapy.A logistic regression model was used to examine the associations between chemotherapy and potential confounders and a Cox proportional hazards model was employed to examine the effect of chemotherapy on overall survival(OS).Propensity score analyses were further performed to balance measurable confounders between patients treated with and without *** A total of 29182 patients met criteria for inclusion in this analysis,with 21911(75%)receiving chemotherapy and 7271(25%)not receiving *** median follow-up was 69.45 *** median OS for patients receiving chemotherapy was 9.53 mo(9.33-9.72)vs 2.43 mo(2.27-2.60)with no *** of diagnosis 2010-2014[odds ratio(OR):1.29,95%confidence interval(CI):1.17-1.43,P value$46000(OR:1.49,95%CI:1.27-1.75,P value<0.001),and node-positivity(OR:1.35,95%CI:1.20-1.52,P<0.001)were independent predictors of receiving chemotherapy,while female gender(OR:0.86,95%CI:0.76-0.98,P=0.019),black race(OR:0.76,95%CI:0.67-0.93,P=0.005),uninsured status(OR:0.41,95%CI:0.33-0.52,P<0.001),and high Charlson Comorbidity Index(CCI)(OR for CCI≥2:0.61,95%CI:0.50-0.74,P<0.001)predicted for lower odds of receiving *** the effect of chemotherapy on OS using a time-dependent coefficient showed that chemotherapy was associated with improved OS up to 10 mo,after which there is no significant effect on ***,uninsured status[hazard ratio(HR):1.20,95%CI:1.09-1.31,P<0.001],being from the geographic

关键词： Esophageal cancer Metastatic Chemotherapy Predictors Survival

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东北亚能源合作的期待效果与中国的作用

国际经济评论 2005年第6期 39-44页

作者：金成珍中国社会科学院世界经济与政治研究所

20世纪80、90年代一度稳定的国际石油价格,自2004年起呈上升趋势,维持了历史上最高纪录.国际油价以迪拜油为基准,2003年每桶平均26.8美元,而2004年高达33.64美元,比上年增长25.6%,直至2005年第三季度为止平均价格比2004年增长了64.8%.... 详细信息

20世纪80、90年代一度稳定的国际石油价格,自2004年起呈上升趋势,维持了历史上最高纪录.国际油价以迪拜油为基准,2003年每桶平均26.8美元,而2004年高达33.64美元,比上年增长25.6%,直至2005年第三季度为止平均价格比2004年增长了64.8%.国际油价的暴涨源于中东产油国的动荡不安,储蓄及美元贬值而引起的投机资金大量地流入世界石油市场及由台风引起的美国石油设施的破坏等因素.固然存在这些原因,但是,最根本的原因还在于世界石油市场供给不足,即目前世界石油生产及炼油能力还属于停滞阶段,但对石油的需要却在暴涨.这种供给不足的情况短期内很难解决,有关专家认为冷后高油价还将持续一段时间,部分地区的油价还将超过每桶80美元,甚至达到100美元.因此,世界各国不得不联想起20世纪70年代爆发的两次石油危机,对于是否会再次陷入经济恐慌的问题深感忧虑.

关键词：能源合作 20世纪70年代国际石油价格世界石油市场东北亚美元贬值中国期待国际油价市场供给

Multiple Coils Recognition System for Unmanned Crane Using Stereo Vision

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Multiple Coils Recognition System for Unmanned Crane Using S...