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David Eisenberg - One of the best experts on this subject based on the ideXlab platform.

  • Urea oxidation electrocatalysis on nickel hydroxide: the role of disorder
    Journal of Solid State Electrochemistry, 2020
    Co-Authors: Sankalpita Chakrabarty, Inbal Offen-polak, Tomer Y. Burshtein, Eliyahu M. Farber, Lior Kornblum, David Eisenberg
    Abstract:

    The urea oxidation reaction (UOR) is an important challenge in electrocatalysis, in the context of electrolyzers, fuel cells, medical sensing, and bio-waste treatment. The leading electrocatalysts for the UOR are nickel hydroxide surfaces, operating by the Botte mechanism: Ni^II(OH)_2 is oxidized to Ni^IIIOOH, and the latter drives the UOR. However, these materials have several polymorphs, with α- and β-Ni(OH)_2, and γ- and β-NiOOH, as described by the Bode Diagram. We now report a systematic study of a series of nickel hydroxides, varying gradually from α-rich to β-rich materials. The crystallinity, order, hydration, intercalation, and morphology of these materials have been characterized by XRD, Raman, ATR-FTIR, XPS, and HRSEM and linked to their electrochemical activity. The disordered α phase was found to be superior to the β phase as a UOR electrocatalyst, with an oxidation onset potential of 0.31 V vs. SCE, better reversibility, and higher anodic current densities. Moreover, the perfect match in onset potentials between UOR electrocatalysis and the Ni^2+/Ni^3+ oxidation was observed for both phases, suggesting that the Botte mechanism is true for both the α-Ni(OH)_2/γ-NiOOH couple and the β-Ni(OH)_2/β-NiOOH couple. We further characterize the dynamic behavior of these materials (activation and aging), allowing us to propose a unified Botte-Bode Diagram of UOR on Ni(OH)_2/NiOOH.

  • Urea oxidation electrocatalysis on nickel hydroxide: the role of disorder
    Journal of Solid State Electrochemistry, 2020
    Co-Authors: Sankalpita Chakrabarty, Inbal Offen-polak, Tomer Y. Burshtein, Eliyahu M. Farber, Lior Kornblum, David Eisenberg
    Abstract:

    The urea oxidation reaction (UOR) is an important challenge in electrocatalysis, in the context of electrolyzers, fuel cells, medical sensing, and bio-waste treatment. The leading electrocatalysts for the UOR are nickel hydroxide surfaces, operating by the Botte mechanism: Ni^II(OH)_2 is oxidized to Ni^IIIOOH, and the latter drives the UOR. However, these materials have several polymorphs, with α- and β-Ni(OH)_2, and γ- and β-NiOOH, as described by the Bode Diagram. We now report a systematic study of a series of nickel hydroxides, varying gradually from α-rich to β-rich materials. The crystallinity, order, hydration, intercalation, and morphology of these materials have been characterized by XRD, Raman, ATR-FTIR, XPS, and HRSEM and linked to their electrochemical activity. The disordered α phase was found to be superior to the β phase as a UOR electrocatalyst, with an oxidation onset potential of 0.31 V vs. SCE, better reversibility, and higher anodic current densities. Moreover, the perfect match in onset potentials between UOR electrocatalysis and the Ni^2+/Ni^3+ oxidation was observed for both phases, suggesting that the Botte mechanism is true for both the α-Ni(OH)_2/γ-NiOOH couple and the β-Ni(OH)_2/β-NiOOH couple. We further characterize the dynamic behavior of these materials (activation and aging), allowing us to propose a unified Botte-Bode Diagram of UOR on Ni(OH)_2/NiOOH.

Sankalpita Chakrabarty - One of the best experts on this subject based on the ideXlab platform.

  • Urea oxidation electrocatalysis on nickel hydroxide: the role of disorder
    Journal of Solid State Electrochemistry, 2020
    Co-Authors: Sankalpita Chakrabarty, Inbal Offen-polak, Tomer Y. Burshtein, Eliyahu M. Farber, Lior Kornblum, David Eisenberg
    Abstract:

    The urea oxidation reaction (UOR) is an important challenge in electrocatalysis, in the context of electrolyzers, fuel cells, medical sensing, and bio-waste treatment. The leading electrocatalysts for the UOR are nickel hydroxide surfaces, operating by the Botte mechanism: Ni^II(OH)_2 is oxidized to Ni^IIIOOH, and the latter drives the UOR. However, these materials have several polymorphs, with α- and β-Ni(OH)_2, and γ- and β-NiOOH, as described by the Bode Diagram. We now report a systematic study of a series of nickel hydroxides, varying gradually from α-rich to β-rich materials. The crystallinity, order, hydration, intercalation, and morphology of these materials have been characterized by XRD, Raman, ATR-FTIR, XPS, and HRSEM and linked to their electrochemical activity. The disordered α phase was found to be superior to the β phase as a UOR electrocatalyst, with an oxidation onset potential of 0.31 V vs. SCE, better reversibility, and higher anodic current densities. Moreover, the perfect match in onset potentials between UOR electrocatalysis and the Ni^2+/Ni^3+ oxidation was observed for both phases, suggesting that the Botte mechanism is true for both the α-Ni(OH)_2/γ-NiOOH couple and the β-Ni(OH)_2/β-NiOOH couple. We further characterize the dynamic behavior of these materials (activation and aging), allowing us to propose a unified Botte-Bode Diagram of UOR on Ni(OH)_2/NiOOH.

  • Urea oxidation electrocatalysis on nickel hydroxide: the role of disorder
    Journal of Solid State Electrochemistry, 2020
    Co-Authors: Sankalpita Chakrabarty, Inbal Offen-polak, Tomer Y. Burshtein, Eliyahu M. Farber, Lior Kornblum, David Eisenberg
    Abstract:

    The urea oxidation reaction (UOR) is an important challenge in electrocatalysis, in the context of electrolyzers, fuel cells, medical sensing, and bio-waste treatment. The leading electrocatalysts for the UOR are nickel hydroxide surfaces, operating by the Botte mechanism: Ni^II(OH)_2 is oxidized to Ni^IIIOOH, and the latter drives the UOR. However, these materials have several polymorphs, with α- and β-Ni(OH)_2, and γ- and β-NiOOH, as described by the Bode Diagram. We now report a systematic study of a series of nickel hydroxides, varying gradually from α-rich to β-rich materials. The crystallinity, order, hydration, intercalation, and morphology of these materials have been characterized by XRD, Raman, ATR-FTIR, XPS, and HRSEM and linked to their electrochemical activity. The disordered α phase was found to be superior to the β phase as a UOR electrocatalyst, with an oxidation onset potential of 0.31 V vs. SCE, better reversibility, and higher anodic current densities. Moreover, the perfect match in onset potentials between UOR electrocatalysis and the Ni^2+/Ni^3+ oxidation was observed for both phases, suggesting that the Botte mechanism is true for both the α-Ni(OH)_2/γ-NiOOH couple and the β-Ni(OH)_2/β-NiOOH couple. We further characterize the dynamic behavior of these materials (activation and aging), allowing us to propose a unified Botte-Bode Diagram of UOR on Ni(OH)_2/NiOOH.

Panagiotis Tsiotras - One of the best experts on this subject based on the ideXlab platform.

  • The relation between the 3-D Bode Diagram and the root locus: insights into the connection between these classical methods
    IEEE Control Systems, 2005
    Co-Authors: Panagiotis Tsiotras
    Abstract:

    This paper revisits the generalized Bode Diagram technique and demonstrates its usefulness for gaining a deeper understanding of both Bode and root locus analysis. Additional insights on the connection between these two analysis methods are provided and this connection is demonstrated using several examples.

  • The Relation Between the 3-D Bode Diagram and the Root Locus
    2005
    Co-Authors: Panagiotis Tsiotras
    Abstract:

    ode Diagramsand root locusplots havebeen the cor-nerstone ofcontrol analy-sis and synthesis for sin-gle-input, single-output(SISO) systems since theseminal work of Bode [1]and Evans [2]. Along withthe Nyquist plot [3], thesetechniques form the majorpart of what is commonlyknown as classical control methods. Three-dimensional(3-D) extensions of the classical Bode, Nyquist, and rootlocus plots have also been proposed [4], where the thirddimension is either the frequency (inthe Bode or Nyquist plots) or the gain(in root locus plots). The latter iscalled a gain plot in [4] and providesexplicit information on the damping and frequency of theclosed-loop eigenvalues as a function of the forward gain.An alternative extension of classical Bode analysis wasintroduced in the classical text on flight mechanics [5].Specifically, in [5, pp.112–153] the authors showthe interrelationship be-tween the root locus andfrequency response dia-grams. By adding a thirddimension to the classicalroot locus plot (the gain)they show how this 3-D plotcan be used to compute thelocation of the closed-looproots as the intersection ofpaths of steepest descentwith the correspondingcontours of the logarithmic magnitude plot. Since thistechnique is not widely known and, to our knowledge,does not appear in standard undergraduate textbooks, thepurpose of the present article is torevisit the generalized Bode Diagramtechnique and demonstrate its useful-ness for gaining a deeper understand-ing of both Bode and root locus analysis. Specifically, weprovide additional insights on the connection betweenthese two analysis methods, and we demonstrate this con-nection with several examples.

Inbal Offen-polak - One of the best experts on this subject based on the ideXlab platform.

  • Urea oxidation electrocatalysis on nickel hydroxide: the role of disorder
    Journal of Solid State Electrochemistry, 2020
    Co-Authors: Sankalpita Chakrabarty, Inbal Offen-polak, Tomer Y. Burshtein, Eliyahu M. Farber, Lior Kornblum, David Eisenberg
    Abstract:

    The urea oxidation reaction (UOR) is an important challenge in electrocatalysis, in the context of electrolyzers, fuel cells, medical sensing, and bio-waste treatment. The leading electrocatalysts for the UOR are nickel hydroxide surfaces, operating by the Botte mechanism: Ni^II(OH)_2 is oxidized to Ni^IIIOOH, and the latter drives the UOR. However, these materials have several polymorphs, with α- and β-Ni(OH)_2, and γ- and β-NiOOH, as described by the Bode Diagram. We now report a systematic study of a series of nickel hydroxides, varying gradually from α-rich to β-rich materials. The crystallinity, order, hydration, intercalation, and morphology of these materials have been characterized by XRD, Raman, ATR-FTIR, XPS, and HRSEM and linked to their electrochemical activity. The disordered α phase was found to be superior to the β phase as a UOR electrocatalyst, with an oxidation onset potential of 0.31 V vs. SCE, better reversibility, and higher anodic current densities. Moreover, the perfect match in onset potentials between UOR electrocatalysis and the Ni^2+/Ni^3+ oxidation was observed for both phases, suggesting that the Botte mechanism is true for both the α-Ni(OH)_2/γ-NiOOH couple and the β-Ni(OH)_2/β-NiOOH couple. We further characterize the dynamic behavior of these materials (activation and aging), allowing us to propose a unified Botte-Bode Diagram of UOR on Ni(OH)_2/NiOOH.

  • Urea oxidation electrocatalysis on nickel hydroxide: the role of disorder
    Journal of Solid State Electrochemistry, 2020
    Co-Authors: Sankalpita Chakrabarty, Inbal Offen-polak, Tomer Y. Burshtein, Eliyahu M. Farber, Lior Kornblum, David Eisenberg
    Abstract:

    The urea oxidation reaction (UOR) is an important challenge in electrocatalysis, in the context of electrolyzers, fuel cells, medical sensing, and bio-waste treatment. The leading electrocatalysts for the UOR are nickel hydroxide surfaces, operating by the Botte mechanism: Ni^II(OH)_2 is oxidized to Ni^IIIOOH, and the latter drives the UOR. However, these materials have several polymorphs, with α- and β-Ni(OH)_2, and γ- and β-NiOOH, as described by the Bode Diagram. We now report a systematic study of a series of nickel hydroxides, varying gradually from α-rich to β-rich materials. The crystallinity, order, hydration, intercalation, and morphology of these materials have been characterized by XRD, Raman, ATR-FTIR, XPS, and HRSEM and linked to their electrochemical activity. The disordered α phase was found to be superior to the β phase as a UOR electrocatalyst, with an oxidation onset potential of 0.31 V vs. SCE, better reversibility, and higher anodic current densities. Moreover, the perfect match in onset potentials between UOR electrocatalysis and the Ni^2+/Ni^3+ oxidation was observed for both phases, suggesting that the Botte mechanism is true for both the α-Ni(OH)_2/γ-NiOOH couple and the β-Ni(OH)_2/β-NiOOH couple. We further characterize the dynamic behavior of these materials (activation and aging), allowing us to propose a unified Botte-Bode Diagram of UOR on Ni(OH)_2/NiOOH.

Tomer Y. Burshtein - One of the best experts on this subject based on the ideXlab platform.

  • Urea oxidation electrocatalysis on nickel hydroxide: the role of disorder
    Journal of Solid State Electrochemistry, 2020
    Co-Authors: Sankalpita Chakrabarty, Inbal Offen-polak, Tomer Y. Burshtein, Eliyahu M. Farber, Lior Kornblum, David Eisenberg
    Abstract:

    The urea oxidation reaction (UOR) is an important challenge in electrocatalysis, in the context of electrolyzers, fuel cells, medical sensing, and bio-waste treatment. The leading electrocatalysts for the UOR are nickel hydroxide surfaces, operating by the Botte mechanism: Ni^II(OH)_2 is oxidized to Ni^IIIOOH, and the latter drives the UOR. However, these materials have several polymorphs, with α- and β-Ni(OH)_2, and γ- and β-NiOOH, as described by the Bode Diagram. We now report a systematic study of a series of nickel hydroxides, varying gradually from α-rich to β-rich materials. The crystallinity, order, hydration, intercalation, and morphology of these materials have been characterized by XRD, Raman, ATR-FTIR, XPS, and HRSEM and linked to their electrochemical activity. The disordered α phase was found to be superior to the β phase as a UOR electrocatalyst, with an oxidation onset potential of 0.31 V vs. SCE, better reversibility, and higher anodic current densities. Moreover, the perfect match in onset potentials between UOR electrocatalysis and the Ni^2+/Ni^3+ oxidation was observed for both phases, suggesting that the Botte mechanism is true for both the α-Ni(OH)_2/γ-NiOOH couple and the β-Ni(OH)_2/β-NiOOH couple. We further characterize the dynamic behavior of these materials (activation and aging), allowing us to propose a unified Botte-Bode Diagram of UOR on Ni(OH)_2/NiOOH.

  • Urea oxidation electrocatalysis on nickel hydroxide: the role of disorder
    Journal of Solid State Electrochemistry, 2020
    Co-Authors: Sankalpita Chakrabarty, Inbal Offen-polak, Tomer Y. Burshtein, Eliyahu M. Farber, Lior Kornblum, David Eisenberg
    Abstract:

    The urea oxidation reaction (UOR) is an important challenge in electrocatalysis, in the context of electrolyzers, fuel cells, medical sensing, and bio-waste treatment. The leading electrocatalysts for the UOR are nickel hydroxide surfaces, operating by the Botte mechanism: Ni^II(OH)_2 is oxidized to Ni^IIIOOH, and the latter drives the UOR. However, these materials have several polymorphs, with α- and β-Ni(OH)_2, and γ- and β-NiOOH, as described by the Bode Diagram. We now report a systematic study of a series of nickel hydroxides, varying gradually from α-rich to β-rich materials. The crystallinity, order, hydration, intercalation, and morphology of these materials have been characterized by XRD, Raman, ATR-FTIR, XPS, and HRSEM and linked to their electrochemical activity. The disordered α phase was found to be superior to the β phase as a UOR electrocatalyst, with an oxidation onset potential of 0.31 V vs. SCE, better reversibility, and higher anodic current densities. Moreover, the perfect match in onset potentials between UOR electrocatalysis and the Ni^2+/Ni^3+ oxidation was observed for both phases, suggesting that the Botte mechanism is true for both the α-Ni(OH)_2/γ-NiOOH couple and the β-Ni(OH)_2/β-NiOOH couple. We further characterize the dynamic behavior of these materials (activation and aging), allowing us to propose a unified Botte-Bode Diagram of UOR on Ni(OH)_2/NiOOH.