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H : 소장처정보

T : 목차정보

Journal of the Electrochemical Society : JES 157건

  1. [해외논문]   Electrochemical Atomic Layer Deposition of Cobalt Enabled by the Surface-Limited Redox Replacement of Underpotentially Deposited Zinc  

    Venkatraman, Kailash (<sup>a</sup>Department of Chemical and Biomolecular Engineering, Case Western Reserve University, Cleveland, Ohio 44106, USA ) , Dordi, Yezdi (<sup>b</sup>Lam Research Corporation, Fremont, California 94538, USA ) , Akolkar, Rohan (<sup>a</sup>Department of Chemical and Biomolecular Engineering, Case Western Reserve University, Cleveland, Ohio 44106, USA)
    Journal of the Electrochemical Society : JES v.164 no.2 ,pp. D104 - D109 , 2017 , 0013-4651 ,

    초록

    Electrochemical atomic layer deposition (e-ALD) process for fabricating cobalt (Co) nano-films is reported. The e-ALD process employs a two-step approach in which underpotential deposition (UPD) is first used to form a sacrificial adlayer of zinc (Zn) on a ruthenium (Ru) substrate. The sacrificial Zn adlayer then undergoes spontaneous surface-limited redox replacement (SLRR) by nobler Co. This provides an atomic layer of Co on the substrate surface. The two-step process is repeated cyclically to build multilayers of Co. The unique feature of the e-ALD approach presented herein is that it utilizes Zn as the sacrificial adlayer instead of Pb or Cu used conventionally in the e-ALD sequence of noble metals. The use of sacrificial Zn uniquely renders its redox replacement by Co to be thermodynamically favorable, thereby enabling Co e-ALD. In the present report, we discuss the electrochemical characteristics of the UPD and SLRR process steps, the e-ALD deposition rate and the deposit surface roughness. The Co deposits formed via e-ALD do not exhibit roughness amplification during the first 10 cycles of e-ALD, which is indicative of atomic-scale layer-by-layer growth of Co on the underlying Ru substrate.

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  2. [해외논문]   Voltammetric Determination of Ternary Phenolic Antioxidants Mixtures with Peaks Separation by ICA  

    Gó , rski, Łukasz , Sordoó , ń , , Wanda , Jakubowska, Małgorzata
    Journal of the Electrochemical Society : JES v.164 no.2 ,pp. H42 - H48 , 2017 , 0013-4651 ,

    초록

    The paper refers to the problem of separation of the overlapping signals in voltammetry, which was resolved by the assumption that the univariate calibration models for the individual analytes are requested. It was demonstrated that Independent Components Analysis (ICA) is an effective tool for reconstruction of the successive signals shape, peak positions and also the basic validation parameters meet the typical criteria. Simulation approach enabled selection of the optimal set of mixtures, necessary for the effective operation of the ICA and high predictive ability of the calibration models. It was proved that the triples of analytes chosen from the list of four phenolic acids, ie. caffeic of 9.9 – 87.6 μM, ferulic of 5.9 – 52.6 μM, syringic of 9.9 – 87.3 μM, and vanillic acid of 13.9 – 122.7 μM may be successfully simultaneously determined by differential pulse voltammetry on boron doped diamond electrode, excluding samples at concentrations close to the lower limit of linearity.

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  3. [해외논문]   Improvement of the Cycling Performance and Thermal Stability of Lithium-Ion Batteries by Coating Cathode Materials with Al2O3 Nano Layer  

    Cao, Zhaoxia (<sup>a</sup>School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, People's Republic of China ) , Li, Yanlei (<sup>a</sup>School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, People's Republic of China ) , Shi, Mengjiao (<sup>a</sup>School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, People's Republic of China ) , Zhu, Guangshuang (<sup>a</sup>School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, People's Republic of China ) , Zhang, Ruirui (<sup>a</sup>School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, People's Republic of China ) , Li, Xiangnan (<sup>a</sup>School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, People's Republic of China ) , Yue, Hongyun (<sup>a</sup>School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, People's Republic of China ) , Yang, Shuting (<sup>a</sup>School of Chemistry and Chemical Eng)
    Journal of the Electrochemical Society : JES v.164 no.2 ,pp. A475 - A481 , 2017 , 0013-4651 ,

    초록

    Forming uniform metal oxide nano-coating is a well-known challenge in the construction of coating materials. Herein, we demonstrate the effectiveness of Al 2 O 3 coating on different kinds of core cathode active materials by a simple, facile method, forming a uniform surface-coating layer with thicknesses achieving nanometers precision. Typically, the uniform, nano-sized and controllable Al 2 O 3 coating layer endows LiNi 0.5 Co 0.2 Mn 0.3 O 2 cathode material with superior high-voltage cycling and thermal stability. The superior cycling stability can be attributed to the reduced side reactions, decreased polarization and suppressed dissolution of transition metals. In addition, we also confirm the coating effect for LiMn 2 O 4 and LiNi 0.8 Co 0.15 Al 0.05 O 2 , the results show a similar improvement in the electrochemical performance to LiNi 0.5 Co 0.2 Mn 0.3 O 2 at high temperature and high operating voltage.

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  4. [해외논문]   An Advanced All Phosphate Lithium-Ion Battery Providing High Electrochemical Stability, High Rate Capability and Long-Term Cycling Performance  

    Yu, Shicheng (<sup>a</sup>Institute of Energy and Climate Research, Forschungszentrum Julich, IEK-9, D-52425 Julich, Germany ) , Mertens, Andreas (<sup>a</sup>Institute of Energy and Climate Research, Forschungszentrum Julich, IEK-9, D-52425 Julich, Germany ) , Schierholz, Roland (<sup>a</sup>Institute of Energy and Climate Research, Forschungszentrum Julich, IEK-9, D-52425 Julich, Germany ) , Gao, Xin (<sup>a</sup>Institute of Energy and Climate Research, Forschungszentrum Julich, IEK-9, D-52425 Julich, Germany ) , Aslanbas, Ozgur (<sup>a</sup>Institute of Energy and Climate Research, Forschungszentrum Julich, IEK-9, D-52425 Julich, Germany ) , Mertens, Josef (<sup>a</sup>Institute of Energy and Climate Research, Forschungszentrum Julich, IEK-9, D-52425 Julich, Germany ) , Kungl, Hans (<sup>a</sup>Institute of Energy and Climate Research, Forschungszentrum Julich, IEK-9, D-52425 Julich, Germany ) , Tempel, Hermann (<sup>a</sup>Institute of Energy and Climate Research, Forschungszentrum Julich, IEK-9, D-52425 Julich, Germany ) , Eichel, Rudiger-A. (<sup>a</sup>Institute of Energy and Climate Research, Forschungszentrum Julich, IEK-9,)
    Journal of the Electrochemical Society : JES v.164 no.2 ,pp. A370 - A379 , 2017 , 0013-4651 ,

    초록

    High rate capability and long-term cycling spindle-like LiTi 2 (PO 4 ) 3 /C anode and needle-like Li 3 V 2 (PO 4 ) 3 cathode have been evaluated in half-cell, and combined to fabricate an advanced fast cyclable all phosphate lithium-ion battery. The electrode materials with well-defined morphology were prepared by a solvothermal reaction followed by annealing, delivering capacities of 115.0 and 118.1 mAh·g −1 at 25°C over 200 cycles at 0.5 C, respectively. For the full cell assembly, no prelithiation process is needed for the selected electrode pair due to their mutually matched capacity and stoichiometric amount of lithium-ions. The fabricated full cell, with an output voltage of more than 1.5 V, inherits a superior rate capability and cycling performance of its electrodes. A discharge capacity of 36 mAh·g −1 at 30 C (about 30% of the initial discharge capacity at 0.1 C) and a capacity retention of ∼35% at 5 C over 1000 cycles has been achieved. Furthermore, one of the most important reasons for the capacity fading in the full cell during long-term cycling is found to be a decomposition and structural degradation of Li 3 V 2 (PO 4 ) 3 cathode material.

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  5. [해외논문]   Erratum: Exploring the Effects of Intermetallic Particle Size and Spacing on the Corrosion of Mg-Al Alloys Using Model Electrodes [J. Electrochem. Soc., 163, C895 (2016)]  

    Bland, L. G. (<sup>a</sup>Department of Materials Science and Engineering, University of Virginia, Charlottesville, Virginia 22904, USA ) , Birbilis, N. (<sup>a</sup>Department of Materials Science and Engineering, University of Virginia, Charlottesville, Virginia 22904, USA ) , Scully, J. R. (<sup>a</sup>Department of Materials Science and Engineering, University of Virginia, Charlottesville, Virginia 22904, USA)
    Journal of the Electrochemical Society : JES v.164 no.2 ,pp. X1 - X1 , 2017 , 0013-4651 ,

    초록

    High rate capability and long-term cycling spindle-like LiTi 2 (PO 4 ) 3 /C anode and needle-like Li 3 V 2 (PO 4 ) 3 cathode have been evaluated in half-cell, and combined to fabricate an advanced fast cyclable all phosphate lithium-ion battery. The electrode materials with well-defined morphology were prepared by a solvothermal reaction followed by annealing, delivering capacities of 115.0 and 118.1 mAh·g −1 at 25°C over 200 cycles at 0.5 C, respectively. For the full cell assembly, no prelithiation process is needed for the selected electrode pair due to their mutually matched capacity and stoichiometric amount of lithium-ions. The fabricated full cell, with an output voltage of more than 1.5 V, inherits a superior rate capability and cycling performance of its electrodes. A discharge capacity of 36 mAh·g −1 at 30 C (about 30% of the initial discharge capacity at 0.1 C) and a capacity retention of ∼35% at 5 C over 1000 cycles has been achieved. Furthermore, one of the most important reasons for the capacity fading in the full cell during long-term cycling is found to be a decomposition and structural degradation of Li 3 V 2 (PO 4 ) 3 cathode material.

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  6. [해외논문]   Fabrication and Corrosion Performances of Pure Ni and Ni-Based Coatings Containing Rare Earth Element Ce and Graphene by Reverse Pulse Electrodeposition  

    Zhou, Pengwei (<sup>a</sup>State Key Lab of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China ) , Li, Wei (<sup>a</sup>State Key Lab of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China ) , Li, Yu (<sup>a</sup>State Key Lab of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China ) , Lu, Xianwen (<sup>b</sup>Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China ) , Jin, Xuejun (<sup>a</sup>State Key Lab of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China ) , Chen, Jian (<sup>c</sup>Jiangsu Key Laboratory for Advanced Metallic Materials, School of Materials Science and Engineering, Southeast Universi)
    Journal of the Electrochemical Society : JES v.164 no.2 ,pp. D75 - D81 , 2017 , 0013-4651 ,

    초록

    Pure Ni and Ni-based coatings containing rare earth element Ce and/or graphene were fabricated by reverse pulse electrodeposition. The influences of adding Ce and/or graphene on the electro-crystallization processes, the surface morphologies and the corrosion resistance of these composite coatings have been systematically studies and discussed using scanning electron microscope, Energy Dispersive Spectrometer, X-ray diffractometer, Raman, X-ray photoelectron spectroscopy and electrochemical measurements including electrochemical impedance spectroscopy and potentiodynamic polarization. The results showed that the incorporation of Ce and/or graphene into deposits significantly refined the microstructure and enhance the corrosion resistance of Ni deposits. Furthermore, a more apparent effect on improving corrosion resistance of coatings could be obtained by adding graphene than by adding Ce since graphene itself also owns the excellent anticorrosion property and impermeability except the refinement effect. Finally the best anticorrosion performance was observed in Ni-Ce-graphene coating perhaps due to the combined effects of Ce and graphene.

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  7. [해외논문]   Shell-Thickness-Controlled Synthesis of Core-Shell Pd@Pt Nanocubes and Tuning of Their Oxygen Reduction Activities  

    Yang, Chia-Chen , Liu, Zhe-Ting , Lyu, Yuan-Ping , Lee, Chien-Liang
    Journal of the Electrochemical Society : JES v.164 no.2 ,pp. H112 - H118 , 2017 , 0013-4651 ,

    초록

    An approach to control Pt shell thickness in the synthesis of Pd@Pt core-shell nanocubes (NCs) has been successfully developed. Tuning the Pt and Pd precursor concentration ratio (Pt 4+ /Pd 2+ ) in the reaction mixture allowed precise control over the Pt shell thickness in the range of 0.3–4.9 nm. At low Pt 4+ /Pd 2+ ratios (≤1/4), the deposition of Pt occurred via a layer-by-layer mode, whereas layer-by-layer deposition followed by Pt island growth was possible at higher Pt 4+ /Pd 2+ ratios (1/3, 1/2, and 1). Additionally, rotating ring-disk electrode experiments determined the shell-thickness-dependent specific activities (SAs) and mass activities (MAs) of these Pd@Pt NCs, which acted as oxygen reduction catalysts in NaOH solution. Among these core-shell catalysts, the Pd 1 @Pt 1/6 NCs (0.3 nm Pt shell) displayed the highest SA (0.4398 mA cm –2 ) and MA (2.915 mA μg –1 ) values, which were 3.38 and 2.53 times higher than the corresponding values for Pt nanoparticles (SA = 0.13 mA cm –2 , MA = 1.15 mA μg –1 ). These results, supported by X ray photoelectron spectroscopy observations, indicate that the high activity of Pd 1 @Pt 1/6 NCs is due to the modified electronic properties of the Pt shell influenced by the Pd NC core.

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  8. [해외논문]   Lunar Soil Simulant Electrolysis Using Inert Anode for Al-Si Alloy and Oxygen Production  

    Liu, Aimin (<sup>a</sup>School of Metallurgy, Northeastern University, Shenyang 110004, People's Republic of China ) , Shi, Zhongning (<sup>a</sup>School of Metallurgy, Northeastern University, Shenyang 110004, People's Republic of China ) , Hu, Xianwei (<sup>a</sup>School of Metallurgy, Northeastern University, Shenyang 110004, People's Republic of China ) , Gao, Bingliang (<sup>a</sup>School of Metallurgy, Northeastern University, Shenyang 110004, People's Republic of China ) , Wang, Zhaowen (<sup>a</sup>School of Metallurgy, Northeastern University, Shenyang 110004, People's Republic of China)
    Journal of the Electrochemical Society : JES v.164 no.2 ,pp. H126 - H133 , 2017 , 0013-4651 ,

    초록

    NEU-1, a new lunar soil simulant mined from the Longgang Volcano Group in Jilin Province of China, was electrochemically split into Al-Si alloy and oxygen in molten 52.7wt%NaF-47.3wt%AlF 3 at 1233 K using 56wt%Fe-44wt%Ni metallic inert anode. The anode gas was analyzed by gas chromatography, while the cathode product obtained by galvanostatic electrolysis for 8 h was analyzed by means of X-ray diffraction, X-ray fluorescence, scanning electron microscopy and energy dispersive spectrometer. The results showed that the phase compositions of the cathode product are Al and Si, while the metallic mass fraction is 56.70 wt% Al, 40.80 wt% Si, 2.25 wt% Fe, and 0.25 wt% Ti, respectively. Besides, the outlet gas on the anode during electrolysis is pure oxygen according to the analysis of gas chromatography.

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  9. [해외논문]   Nanometer-Thin Graphitic Carbon Buffer Layers for Electrolytic MnO2 for Thin-Film Energy Storage Devices  

    Deheryan, Stella (<sup>a</sup>imec, Leuven, Belgium ) , Zargouni, Yafa (<sup>a</sup>imec, Leuven, Belgium ) , Sinha, Rochan (<sup>a</sup>imec, Leuven, Belgium ) , Put, Brecht (<sup>a</sup>imec, Leuven, Belgium ) , Radisic, Aleksandar (<sup>a</sup>imec, Leuven, Belgium ) , Heyns, Marc (<sup>a</sup>imec, Leuven, Belgium ) , Vereecken, Philippe M. (<sup>a</sup>imec, Leuven, Belgium)
    Journal of the Electrochemical Society : JES v.164 no.2 ,pp. A538 - A544 , 2017 , 0013-4651 ,

    초록

    In this study, nanometer thin graphitic carbon coatings were applied as an adhesion layer for the growth of submicron to micron thick electrolytic manganese dioxide (EMD) films for thin-film energy storage devices. The graphitic carbon coating served not only as current collector and adhesion layer between the EMD and the substrate, but also prevented the oxidation of the non-noble TiN substrate during the anodic deposition process. The EMD films consisted of a network of interconnected nanometer-size particles with around 50% porosity. The ability to grow a few hundred nanometer thick EMD film with good adhesion to the current collector is critical for reliable thin-film batteries on high aspect ratio microstructured surfaces. Thin EMD films grown on our graphitic carbon coated TiN substrates showed improved reversible Li-ion intercalation kinetics and increased cycle life compared to similar films deposited on noble metal platinum substrates, thus demonstrating the improved interface properties using the graphitic carbon buffer layer.

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  10. [해외논문]   Fabrication of Three-Dimensional Nanoporous Nickel by Dealloying Mg-Ni-Y Metallic Glasses in Citric Acid Solutions for High-Performance Energy Storage  

    Zuo, Lei , Li, Ran , Jin, Yu , Xu, Hongjie , Zhang, Tao
    Journal of the Electrochemical Society : JES v.164 no.2 ,pp. A348 - A354 , 2017 , 0013-4651 ,

    초록

    Free-standing nanoporous nickel (np-Ni) ribbons were directly synthesized by dealloying Mg 90-x Ni x Y 10 metallic glass ribbons in citric acid aqueous solutions under free conditions. Due to the amorphous nature of the Mg 90-x Ni x Y 10 precursors, the as-dealloyed samples exhibit a uniform nanoporous structure with the ligament size of ∼7 nm. Effects of alloy composition, leaching time, and acid concentration on the resulting nanoporous microstructure were discussed. The lower limit of Ni content in Mg 90-x Ni x Y 10 precursors was identified to be 20%, below which the nanoporous Ni could not be formed. Besides, a linear relationship was established between the ligament size and the leaching time on a logarithmic scale. The ultrafine structure of the obtained np-Ni was associated with the stabilizing effect of citric acid. The as-dealloyed samples with the naturally formed oxide surface of NiO were directly examined as binder-free electrodes for high-performance supercapacitors.

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