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RISS 인기검색어
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- 저자 : Fuzhen Zhang (검색결과 3 건)
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Self-Supported NiSe/Ni Foam: An Efficient 3D Electrode for High-Performance Supercapacitors
Jingtong Zhang,Fuzhen Zhao,Kun Du,Yan Zhou 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.11
Three-dimensional (3D) mixed phases NiSe nanoparticles growing on the nickel foam were synthesized via a simple one-step hydrothermal method. A series of experiments were carried out to control the morphology by adjusting the amount of selenium in the synthetic reaction. Meanwhile, the as-prepared novel column-acicular structure NiSe exist three advantages including ideal electrical conductivity, high specific capacity and high cycling stability. It delivered a high capacitance of 10.8 Fcm -2 at a current density of 5 mA cm -2. An electrochemical capacitor device operating at 1.6V was then constructed using NiSe/NF and activated carbon (AC) as positive and negative electrodes. Moreover, the device showed high energy density of 31 Wh kg -1 at a power density of 0.81 kW kg -1, as well as good cycling stability (77% retention after 1500 cycles).
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Robustness Analysis of Descriptor Systems with Parameter Uncertainties
Chunyu Yang,Qing-Ling Zhang,Fuzhen Zhang,Zheng Zhou 제어·로봇·시스템학회 2010 International Journal of Control, Automation, and Vol.8 No.2
This paper investigates the problem of robustness analysis for descriptor systems with parameter uncertainties in both the derivative and state matrices. Using a parameter dependent Lyapunov function, we derive a linear matrix inequality (LMI) based sufficient condition for the admissibility of the system. Unlike the existing results, our criterion has no restriction on the rank of the derivative matrix. Further, we use the obtained method to study interval descriptor systems and multi-parameter singular perturbed systems. The proposed approaches overcome some drawbacks of the existing results. Finally, we present two numerical examples to show the effectiveness of the main results.
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Electroreduction and Acid–Base Properties of Dipyrrolylquinoxalines
Fu, Zhen,Zhang, Min,Zhu, Weihua,Karnas, Elizabeth,Mase, Kentaro,Ohkubo, Kei,Sessler, Jonathan L.,Fukuzumi, Shunichi,Kadish, Karl M. American Chemical Society 2012 The journal of physical chemistry. A, Molecules, s Vol.116 No.41
<P>The electroreduction and acid–base properties of dipyrrolylquinoxalines of the form H<SUB>2</SUB>DPQ, H<SUB>2</SUB>DPQ(NO<SUB>2</SUB>), and H<SUB>2</SUB>DPQ(NO<SUB>2</SUB>)<SUB>2</SUB> were investigated in benzonitrile (PhCN) containing 0.1 M tetra-<I>n</I>-butylammonium perchlorate (TBAP). This study focuses on elucidating the complete electrochemistry, spectroelectrochemistry, and acid–base properties of H<SUB>2</SUB>DPQ(NO<SUB>2</SUB>)<SUB><I>n</I></SUB> (<I>n</I> = 0, 1, or 2) in PhCN before and after the addition of trifluoroacetic acid (TFA), tetra-<I>n</I>-butylammonium hydroxide (TBAOH), tetra-<I>n</I>-butylammonium fluoride (TBAF), or tetra-<I>n</I>-butylammonium acetate (TBAOAc) to solution. Electrochemical and spectroelectrochemical data provide support for the formation of a monodeprotonated anion after disproportionation of a dipyrrolylquinoxaline radical anion produced initially. The generated monoanion is then further reduced in two reversible one-electron-transfer steps at more negative potentials in the case of H<SUB>2</SUB>DPQ(NO<SUB>2</SUB>) and H<SUB>2</SUB>DPQ(NO<SUB>2</SUB>)<SUB>2</SUB>. Electrochemically monitored titrations of H<SUB>2</SUB>DPQ(NO<SUB>2</SUB>)<SUB><I>n</I></SUB> with OH<SUP>–</SUP>, F<SUP>–</SUP>, or OAc<SUP>–</SUP> (in the form of TBA<SUP>+</SUP>X<SUP>–</SUP> salts) give rise to the same monodeprotonated H<SUB>2</SUB>DPQ(NO<SUB>2</SUB>)<SUB><I>n</I></SUB> produced during electroreduction in PhCN. This latter anion can then be reduced in two additional one-electron-transfer steps in the case of H<SUB>2</SUB>DPQ(NO<SUB>2</SUB>) and H<SUB>2</SUB>DPQ(NO<SUB>2</SUB>)<SUB>2</SUB>. Spectroscopically monitored titrations of H<SUB>2</SUB>DPQ(NO<SUB>2</SUB>)<SUB><I>n</I></SUB> with X<SUP>–</SUP> show a 1:2 stoichiometry and provide evidence for the production of both [H<SUB>2</SUB>DPQ(NO<SUB>2</SUB>)<SUB><I>n</I></SUB>]<SUP>−</SUP> and XHX<SUP>–</SUP>. The spectroscopically measured equilibrium constants range from log β<SUB>2</SUB> = 5.3 for the reaction of H<SUB>2</SUB>DPQ with TBAOAc to log β<SUB>2</SUB> = 8.8 for the reaction of H<SUB>2</SUB>DPQ(NO<SUB>2</SUB>)<SUB>2</SUB> with TBAOH. These results are consistent with a combined deprotonation and anion binding process. Equilibrium constants for the addition of one H<SUP>+</SUP> to each quinoxaline nitrogen of H<SUB>2</SUB>DPQ, H<SUB>2</SUB>DPQ(NO<SUB>2</SUB>), and H<SUB>2</SUB>DPQ(NO<SUB>2</SUB>)<SUB>2</SUB> in PhCN containing 0.1 M TBAP were also determined via electrochemical and spectroscopic means; this gave rise to log β<SUB>2</SUB> values ranging from 0.7 to 4.6, depending upon the number of nitro substituents present on the H<SUB>2</SUB>DPQ core. The redox behavior of the H<SUB>2</SUB>DPQ(NO<SUB>2</SUB>)<SUB><I>n</I></SUB> compounds of the present study were further analyzed through comparisons with simple quinoxalines that lack the two linked pyrrole groups, i.e., Q(NO<SUB>2</SUB>)<SUB><I>n</I></SUB> where <I>n</I> = 0, 1, or 2. It is concluded that the pyrrolic substituents play a critical role in regulating the electrochemical and spectroscopic features of DPQs.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpcafh/2012/jpcafh.2012.116.issue-41/jp3074706/production/images/medium/jp-2012-074706_0017.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp3074706'>ACS Electronic Supporting Info</A></P>
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