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- 저자 : Shuxing (검색결과 5 건)
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Wu, Shuxing,Hui, Kwan San,Hui, Kwun Nam,Yun, Je Moon,Kim, Kwang Ho Elsevier 2017 Chemical engineering journal Vol.317 No.-
<P><B>Abstract</B></P> <P>Desirable porous structure and huge ion-accessible surface area are crucial for rapid electronic and ionic pathway electrodes in high-performance graphene-based electrochemical capacitors. However, graphene nanosheets tend to aggregate and restack because of van der Waals interaction among graphene sheets, resulting in the loss of ion-accessible surface area and unsatisfactory electrochemical performance. To resolve this daunting challenge, a novel approach is developed for the self-assembly of holey graphene sheets intercalated with carbon spheres (H-GCS) to obtain freestanding electrodes by using a simple vacuum filtration approach and a subsequent KOH activation process. Through the introduction of carbon spheres as spacers, the restacking of reduced graphene oxide (rGO) sheets during the filtration process is mitigated efficiently. Pores on rGO sheets produced by subsequent KOH activation also provide rapid ionic diffusion kinetics and high ion-accessible electrochemical surface area, both of which favor the formation of electric double-layer capacitance. Furthermore, a higher degree of graphitization of CSs in H-GCS thin film improves the electrical conductivity of the H-GCS electrode. The H-GCS electrode exhibits 207.1Fg<SUP>−1</SUP> of specific capacitance at a current density of 1Ag<SUP>−1</SUP> in 6MKOH aqueous electrolyte. Moreover, the symmetric electrochemical capacitor assembled with H-GCS electrodes and organic electrolyte is capable of delivering a maximum energy density of 29.5Whkg<SUP>−1</SUP> and a power density of 22.6kWkg<SUP>−1</SUP>.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Self-assembly of holey graphene sheets intercalates with carbon spheres. </LI> <LI> The film electrode exhibits 207.1Fg<SUP>−1</SUP> of specific capacitance. </LI> <LI> Maximum specific energy and power of 29.5Whkg<SUP>−1</SUP> and 22.6kWkg<SUP>−1</SUP> are achieved. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Wu, Shuxing,Hui, Kwan San,Hui, Kwun Nam,Kim, Kwang Ho American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.2
<P>Achieving high energy density while retaining high power density is difficult in electrical double-layer capacitors and in pseudocapacitors considering the Origin of different charge storage mechanisms. Rational structural design became an appealing strategy in circumventing these tradeoffs between energy and power densities. A hybrid:structure consists of chemically converted graphene-encapsiilated carbon@nickel-aluminum layered double hydroxide core shell spheres as spacers among graphene layers (G-CLS) used as an,advanced electrode to achieve high energy density while retaining high power density for high-performance supercapacitors. The merits of the proposed architecture are as follows: (1) CLS act as spacers to avoid the close restacking of graphene; (2)-highly conductive carbon sphere and graphene preserve the mechanical integrity and improve the electrical Conductivity of LDHs hybrid. the proposed hybrid structure can simultaneously achieve high electrical-double-layer capacitance and pseudocapacitance resulting in the overall highly active electrode. The G-CLS electrode exhibited high specific capacitance (1710.5 F g(-1) at 1 A g(-1)) under three-electrode tests. An ASC fabricated using the G-CLS as positive electrode and reduced graphite oxide as negative electrode demonstrated remarkable electrochemical performance. The ASC device operated at 1.4 V and delivered a high energy density of 35:5 Wh kg(-1) at a 670.7 W kg(-1) power density at 1 A g(-1) with an excellent rate capability as well as a robust long-term cycling stability of up to 10 000 cycles.</P>
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A moment-matching robust collaborative optimization method
Fenfen Xiong,Gaorong Sun,Ying Xiong,Shuxing Yang 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.4
Robust collaborative optimization (RCO) is a widely used approach to design multidisciplinary system under uncertainty. In most ofthe existing RCO frameworks, the mean of the state variable is considered as auxiliary design variable and the implicit uncertainty propagationmethod is employed for estimating their uncertainties (interval or standard deviation), which are then used to calculate uncertaintiesin the ending performances. However, as repeated calculation of the global sensitivity equations (GSE) is demanded during the optimizationprocess of the existing approaches, it is typically very cumbersome or even impossible to obtain GSE for many practical engineeringproblems due to the non-smoothness and discontinuity of the black-box-type analysis models. To address this issue, a new RCOmethod is proposed in this paper, in which the standard deviation of the state variable is introduced as auxiliary design variable in additionto the mean. Accordingly, interdisciplinary compatibility constraint on the standard deviation of state variable is added to enhancethe design compatibility between various disciplines. The effectiveness of the proposed method is demonstrated through two mathematicalexamples. The results generated by the conventional robust all-in-one (RAIO) approach are used as benchmarks for comparison. Ourstudy shows that the optimal solutions produced by the proposed RCO method are highly close to those of RAIO while exhibiting goodinterdisciplinary compatibility.
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First-principles study of nitrogen defect g-C3N4/WS2 heterojunction on photocatalytic activity
Wang Yin,Lei Shulai,Zhang Xin,Zhou Shuxing 한국물리학회 2022 Current Applied Physics Vol.39 No.-
In this work, first-principles density functional theory simulations have been performed to investigate the influence of nitrogen (N) defect on the supercell structure, electronic structure and photocatalytic properties of g-C3N4/WS2 heterojunctions. Analyses of calculated binding energies and the lattice mismatch ratios led us to confirm that N-deficient g-C3N4 and WS2 were in parallel contact and form a stable heterojunction. Furthermore, the work functions, molecular dynamics simulations, charge density differences, band structures, DOS, electronic and optical properties and absorption spectra of different g-C3N4/WS2 heterojunctions have been analyzed in detail. It is revealed that the compositing of N-deficient g-C3N4 with WS2 improves the separation of photoinduced electron-hole pairs. N-defect enhances the visible light absorption of the heterojunction, due to the introduction of impurity energy levels. Moreover, the introduction of defect species further improves the photocatalytic performance of g-C3N4/WS2 heterojunction in the visible region.
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