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Adsorbed Oxygen

The Experts below are selected from a list of 264 Experts worldwide ranked by ideXlab platform

Tifeng Jiao – 1st expert on this subject based on the ideXlab platform

  • improved Oxygen reduction activity on silver modified lamno3 graphene via shortens the conduction path of Adsorbed Oxygen
    RSC Advances, 2015
    Co-Authors: Jie Hu, Hao Huang, Tifeng Jiao

    Abstract:

    Silver-modified LaMnO3–reduced graphene oxide (RGO) composites are synthesized via a sol–gel method with citric acid as a chelating agent. The as-prepared nanocomposites are characterized via X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. The XRD results show that decorating with Ag does not change the perovskite structure and it is metal form. The electrocatalytic activities of the composites for the Oxygen reduction reaction are evaluated. The 2 wt% Ag/LaMnO3–RGO as the air cathode catalyst shows a high voltage plateau. The corresponding Oxygen reduction reaction mainly favors a four-electron transfer process, exhibits a maximum cathodic current density of 5.45 mA cm−2 at 1600 rpm, and displays good stability (i/i0 = 92.9% at −0.3 V after 30000 s with a rotation rate of 1600 rpm), which is better than that of the commercial Pt/C (20 wt% Pt on carbon) electrocatalyst at the same testing conditions. Such excellent catalytic activity is attributed to the synergistic effect of Ag, LaMnO3, and graphene in the composite, which provide numerous reactive sites and the modification of Ag shortens the conduction path of Adsorbed Oxygen, thus reducing charge transfer resistance and improving cathode performance.

  • Improved Oxygen reduction activity on silver-modified LaMnO3–graphene via shortens the conduction path of Adsorbed Oxygen
    RSC Advances, 2015
    Co-Authors: Jie Hu, Hao Huang, Tifeng Jiao

    Abstract:

    Silver-modified LaMnO3–reduced graphene oxide (RGO) composites are synthesized via a sol–gel method with citric acid as a chelating agent. The as-prepared nanocomposites are characterized via X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. The XRD results show that decorating with Ag does not change the perovskite structure and it is metal form. The electrocatalytic activities of the composites for the Oxygen reduction reaction are evaluated. The 2 wt% Ag/LaMnO3–RGO as the air cathode catalyst shows a high voltage plateau. The corresponding Oxygen reduction reaction mainly favors a four-electron transfer process, exhibits a maximum cathodic current density of 5.45 mA cm−2 at 1600 rpm, and displays good stability (i/i0 = 92.9% at −0.3 V after 30000 s with a rotation rate of 1600 rpm), which is better than that of the commercial Pt/C (20 wt% Pt on carbon) electrocatalyst at the same testing conditions. Such excellent catalytic activity is attributed to the synergistic effect of Ag, LaMnO3, and graphene in the composite, which provide numerous reactive sites and the modification of Ag shortens the conduction path of Adsorbed Oxygen, thus reducing charge transfer resistance and improving cathode performance.

Perla B Balbuena – 2nd expert on this subject based on the ideXlab platform

  • surface segregation in bimetallic pt3m m fe co ni alloys with Adsorbed Oxygen
    Surface Science, 2009
    Co-Authors: Perla B Balbuena

    Abstract:

    Abstract Surface segregation of Pt 3 M (M = Fe, Co, and Ni) alloys under Oxygen environment has been examined using periodic density functional theory. The segregation trend at a (1 1 1) surface is found to be substantially modified by the Adsorbed Oxygen. Our calculations indicate that under 1/4 monolayer O coverage both the Pt-segregated and M-segregated surfaces are less stable than the non-segregated one. Further analysis reveals that segregation energy under adsorption environments can be expressed as the sum of the segregation energy under vacuum conditions and the adsorption energy difference of the segregated and non-segregated alloy systems. Therefore, the surface segregation trend under adsorption conditions is directly correlated to the surface-adsorbate binding strength.

  • Surface segregation in bimetallic Pt3M (M = Fe, Co, Ni) alloys with Adsorbed Oxygen
    Surface Science, 2009
    Co-Authors: Yuguang Ma, Perla B Balbuena

    Abstract:

    Abstract Surface segregation of Pt 3 M (M = Fe, Co, and Ni) alloys under Oxygen environment has been examined using periodic density functional theory. The segregation trend at a (1 1 1) surface is found to be substantially modified by the Adsorbed Oxygen. Our calculations indicate that under 1/4 monolayer O coverage both the Pt-segregated and M-segregated surfaces are less stable than the non-segregated one. Further analysis reveals that segregation energy under adsorption environments can be expressed as the sum of the segregation energy under vacuum conditions and the adsorption energy difference of the segregated and non-segregated alloy systems. Therefore, the surface segregation trend under adsorption conditions is directly correlated to the surface-adsorbate binding strength.

Jie Hu – 3rd expert on this subject based on the ideXlab platform

  • improved Oxygen reduction activity on silver modified lamno3 graphene via shortens the conduction path of Adsorbed Oxygen
    RSC Advances, 2015
    Co-Authors: Jie Hu, Hao Huang, Tifeng Jiao

    Abstract:

    Silver-modified LaMnO3–reduced graphene oxide (RGO) composites are synthesized via a sol–gel method with citric acid as a chelating agent. The as-prepared nanocomposites are characterized via X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. The XRD results show that decorating with Ag does not change the perovskite structure and it is metal form. The electrocatalytic activities of the composites for the Oxygen reduction reaction are evaluated. The 2 wt% Ag/LaMnO3–RGO as the air cathode catalyst shows a high voltage plateau. The corresponding Oxygen reduction reaction mainly favors a four-electron transfer process, exhibits a maximum cathodic current density of 5.45 mA cm−2 at 1600 rpm, and displays good stability (i/i0 = 92.9% at −0.3 V after 30000 s with a rotation rate of 1600 rpm), which is better than that of the commercial Pt/C (20 wt% Pt on carbon) electrocatalyst at the same testing conditions. Such excellent catalytic activity is attributed to the synergistic effect of Ag, LaMnO3, and graphene in the composite, which provide numerous reactive sites and the modification of Ag shortens the conduction path of Adsorbed Oxygen, thus reducing charge transfer resistance and improving cathode performance.

  • Improved Oxygen reduction activity on silver-modified LaMnO3–graphene via shortens the conduction path of Adsorbed Oxygen
    RSC Advances, 2015
    Co-Authors: Jie Hu, Hao Huang, Tifeng Jiao

    Abstract:

    Silver-modified LaMnO3–reduced graphene oxide (RGO) composites are synthesized via a sol–gel method with citric acid as a chelating agent. The as-prepared nanocomposites are characterized via X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. The XRD results show that decorating with Ag does not change the perovskite structure and it is metal form. The electrocatalytic activities of the composites for the Oxygen reduction reaction are evaluated. The 2 wt% Ag/LaMnO3–RGO as the air cathode catalyst shows a high voltage plateau. The corresponding Oxygen reduction reaction mainly favors a four-electron transfer process, exhibits a maximum cathodic current density of 5.45 mA cm−2 at 1600 rpm, and displays good stability (i/i0 = 92.9% at −0.3 V after 30000 s with a rotation rate of 1600 rpm), which is better than that of the commercial Pt/C (20 wt% Pt on carbon) electrocatalyst at the same testing conditions. Such excellent catalytic activity is attributed to the synergistic effect of Ag, LaMnO3, and graphene in the composite, which provide numerous reactive sites and the modification of Ag shortens the conduction path of Adsorbed Oxygen, thus reducing charge transfer resistance and improving cathode performance.