http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Ming, Jun,Ming, Hai,Kwak, Won-Jin,Shin, Changdae,Zheng, Junwei,Sun, Yang-Kook The Royal Society of Chemistry 2014 Chemical communications Vol.50 No.87
<P>A positive effect of the polyacrylic acid (PAA)–carboxymethyl cellulose (CMC) binder to enhance the performance of an oxide-based anode was reported in batteries. A series of super high capacity and cycling ability oxide powders rarely achieved before was obtained, particularly most of them without any specific carbon modification and/or morphology control.</P> <P>Graphic Abstract</P><P>A positive effect of the polyacrylic acid–carboxymethyl cellulose binder to enhance the performance of an oxide-based anode was reported in batteries. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4cc02657h'> </P>
Ming, Jun,Wu, Yingqiang,Liang, Guanfeng,Park, Jin-Bum,Zhao, Fengyu,Sun, Yang-Kook The Royal Society of Chemistry 2013 Green chemistry Vol.15 No.10
<P>The salt effect of Na<SUB><I>x</I></SUB>A (A = SO<SUB>4</SUB><SUP>2−</SUP>, Cl<SUP>−</SUP>, NO<SUB>3</SUB><SUP>−</SUP>, <I>etc</I>.) on the hydrothermal carbonization of biomass is reported. It is a new catalyst and recyclable template to more simply and effectively prepare carbon-based materials, such as porous carbon-coated anode materials (<I>e.g.</I>, Fe<SUB>3</SUB>O<SUB>4</SUB>@porous-C) in lithium-ion battery applications with enhanced performance.</P> <P>Graphic Abstract</P><P>The sodium salt effect on hydrothermal carbonization of biomass and as a catalyst for carbon-based nanostructured materials for lithium-ion battery applications is reported. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3gc40480c'> </P>
Ming, Jun,Wu, Yingqiang,Nagarajan, Srinivasan,Lee, Dong-Ju,Sun, Yang-Kook,Zhao, Fengyu The Royal Society of Chemistry 2012 Journal of materials chemistry Vol.22 No.41
<P>In this study, an effective method of slow hydrolization of metal alkoxide (<I>e.g.</I>, Ti(C<SUB>4</SUB>H<SUB>9</SUB>O)<SUB>4</SUB>) in an ethanol–water system was systematically investigated and used to finely control the deposition of titania on carbon colloids. A model of adsorption–hydrolization of precursors during the coating process was rationally built for the first time to interpret the usability of the method and facilitate its further extension. Using this strategy, titania in the form of supported nanocrystals or layers on carbon colloids (TiO<SUB>2</SUB>/C, C@TiO<SUB>2</SUB>) was successfully tailored. Meanwhile, finely dispersed hollow TiO<SUB>2</SUB> nanoparticles with shells consisting of different crystalline structures were also prepared by varying the calcination conditions after removing the carbon cores. More importantly, the effects of the crystalline and nano/macrostructures of the as-prepared TiO<SUB>2</SUB> samples in photocatalysis and lithium-ion battery applications were analyzed in detail. The preliminary results show that anatase–rutile TiO<SUB>2</SUB> hollow particles demonstrate a higher catalytic activity in the photo-degradation of rhodamine B than anatase TiO<SUB>2</SUB> hollow particles, powders, and P25. However, in the case of Li-ion battery applications, the anatase TiO<SUB>2</SUB> hollow particles exhibited better performance as anode materials with high capacities of around 190 mA h g<SUP>−1</SUP>, 140 mA h g<SUP>−1</SUP>, and 120 mA h g<SUP>−1</SUP> at current densities of 60 mA g<SUP>−1</SUP>, 120 mA g<SUP>−1</SUP>, and 300 mA g<SUP>−1</SUP>, respectively, accompanied by stable cyclability.</P> <P>Graphic Abstract</P><P>Fine control of the titania deposition to prepare C@TiO<SUB>2</SUB> composites and TiO<SUB>2</SUB> hollow particles for photocatalysis and lithium-ion battery applications. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2jm34106a'> </P>
High surface area, mesoporous carbon for low-polarization, catalyst-free lithium oxygen battery
Ming, Jun,Park, Jin-Bum,Kim, Hee-Soo,Yoon, Chong Seung,Elia, Giuseppe Antonio,Scrosati, Bruno,Sun, Yang-Kook,Hassoun, Jusef Elsevier 2015 Solid state ionics Vol.278 No.-
<P><B>Abstract</B></P> <P>Here we report a low polarization, catalyst-free lithium–oxygen battery using mesoporous carbon electrode. BET analysis, SEM and TEM images evidence that the carbon material has surface area as high as 1500m<SUP>2</SUP> g<SUP>-1</SUP> and a uniform distribution of nanometric pores. Furthermore, X-ray diffraction analysis and TEM images of the reaction products show that the favourable effect of the mesoporous carbon is due to the formation of amorphous nano-particles of lithium peroxide during the electrochemical process. The results of this study clearly indicate the important role of the carbon matrix in determining a favourable morphology of the lithium–oxygen reaction product that leads to enhanced cell behaviour.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Low polarization, catalyst-free lithium–oxygen battery is reported. </LI> <LI> Mesoporous carbon electrode with high surface area is used. </LI> <LI> Amorphous lithium peroxide is formed during the electrochemical process. </LI> <LI> The lithium–oxygen battery has a reversible capacity of 2000mAhg<SUP>−1</SUP>. </LI> <LI> The cell shows a low charge discharge polarization and high energy efficiency. </LI> </UL> </P>
Ming, Jun,Kwak, Won‐,Jin,Park, Jin‐,Bum,Shin, Chang‐,Dae,Lu, Jun,Curtiss, Larry,Amine, Khalil,Sun, Yang‐,Kook WILEY‐VCH Verlag 2014 CHEMPHYSCHEM -WEINHEIM- Vol.15 No.10
<P>A new physical pulverization strategy has been developed to prepare a highly active composite of CoOx and crushed graphite (CG) for the cathode in lithium-oxygen batteries. The effect of CoOx loading on the charge potential in the oxygen evolution reaction (Li2O2 -> 2Li(+) + O-2 + 2e(-)) was investigated in coin-cell tests. The CoOx (38.9 wt%)/CG composite showed a low charge potential of 3.92 V with a delivered capacity of 2 mAh cm(-2) under a current density of 0.2 mA cm(-2). The charge potential was 4.10 and 4.15 V at a capacity of 5 and 10 mAh cm(-2), respectively, with a current density of 0.5 mA cm(-2). The stability of the electrolyte and discharge product on the gas-diffusion layer after the cycling were preliminarily characterized by H-1 nuclear magnetic resonance spectroscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, and X-ray diffraction. The high activity of the composite was further analyzed by electrochemical impedance spectroscopy, cyclic voltammetry, and potential-step chronoamperometry. The results indicate that our near-dry milling method is an effective and green approach to preparing a nanocomposite cathode with high surface area and porosity, while using less solvent. Its relative simplicity compared with the traditional solution method could facilitate its widespread application in catalysis, energy storage, and materials science.</P>
Ming, Jun,Park, Jin-Bum,Sun, Yang-Kook American Chemical Society 2013 ACS APPLIED MATERIALS & INTERFACES Vol.5 No.6
<P>A simple and industrial scalable approach was developed to encapsulate metal oxide nanocrystals into porous carbon (PC) with a high distribution. With this method, the composite of PC-metal oxide were prepared in a large amount with a low cost; particularly they exhibit ultrahigh performances in lithium-ion battery applications. For example, the PC-CoO<SUB><I>x</I></SUB> and PC-FeO<SUB><I>x</I></SUB> show a high capacity around 1021 mA h g<SUP>–1</SUP> and 1200 mA h g<SUP>–1</SUP> at the current density of 100 mA g<SUP>–1</SUP> respectively, together with an excellent cycling ability (>400 cycles) and rate capacity even at the high current densities of 3 A g<SUP>–1</SUP> and 5 A g<SUP>–1</SUP>.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2013/aamick.2013.5.issue-6/am303178g/production/images/medium/am-2012-03178g_0004.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am303178g'>ACS Electronic Supporting Info</A></P>
Dynamic measurements of hydrate based gas separation in cooled silica gel
Mingjun Yang,Yongchen Song,Lanlan Jiang,Xiaojing Wang,Weiguo Liu,Yuechao Zhao,Yu Liu,Shanrong Wang 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.1
Hydrate based gas separation is a promising method for carbon dioxide capture. The purpose of thisstudy is to analyze hydrates formation and dissociation characters when gas mixture flows throughcooled silica gel. The additives mixture (THF/SDS) was used to saturate the silica gel partly, and gasmixture (CO2/H2) was injected into it to form hydrates. Magnetic resonance imaging (MRI) images wereobtained using fast spin echo multi-slice pulse sequence. Hydrates saturations were calculatedquantitatively using MRI data. The experimental results showed that the optimal initial solutionsaturation was 34.2% in this investigation. The gas component was analyzed to assess the separationefficiency. For hydrates dissociation processes at 1 atmospheric pressure, CO2 concentrations increasedobviously. Half of the six cycles showed that more than 85.00 mol% CO2 contained in the capture gas, andthe lowest CO2 concentration was 64.83 mol%. Hydrate blockages appeared frequently, which restrictedthe contact of gas and solution and caused the incomplete transformations of residual solution tohydrates. It was a key restricted factor for hydrate based CO2 capture.
Mingjun Xia Techno-Press 2023 Advances in concrete construction Vol.15 No.5
Aim of this work is investigating effect of thickness-stretching formulation on the quasi three-dimensional analysis of micro plate based on a thickness-stretched and shear deformable model through principle of virtual work and micro-scale dependent constitutive relations. Governing differential equations are derived in terms of five unknown functions and the analytical solution is derived using Navier's technique. To explore effect of thickness stretching model on the static results, a comparison between the results with and without thickness stretching effect is presented.
Distributed Control for Signed Networks of Nonlinear Agents
Mingjun Du,Baoli Ma,Deyuan Meng 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.2
This paper copes with distributed control problems for signed networks that consist of a group of nonlinear agents. A distributed control algorithm is designed by using the nearest neighbor rule. For Lipschitz-type nonlinear dynamics, this algorithm guarantees structurally balanced signed networks to achieve bipartite consensus and structurally unbalanced signed networks to reach state stability, respectively. When bounded nonlinear dynamics are considered, all agents exponentially converge to a definite bound within a finite time, regardless of whether the signed networks are structurally balanced or structurally unbalanced. A Lyapunov approach is simultaneously exploited to carry out the dynamic behaviors analysis of signed networks. Four examples are provided to demonstrate the validity of the developed theoretical results.