Promotion of Ammonia Electrooxidation on Pt nanoparticles by Nickel Oxide Support

Spyridon Ntais; Alexey Serov; Nalin I. Andersen; Aaron J. Roy; Emily Cossar; Anis Allagui; Zhenzhen Lu; Xiaoyu Cui; Elena A. Baranova; Plamen Atanassov

doi:10.1016/j.electacta.2016.11.124

Promotion of Ammonia Electrooxidation on Pt nanoparticles by Nickel Oxide Support

Spyridon Ntais, Alexey Serov, Nalin I. Andersen, Aaron J. Roy, Emily Cossar, Anis Allagui, Zhenzhen Lu, Xiaoyu Cui, Elena A. Baranova, Plamen Atanassov

Research output: Contribution to journal › Article › peer-review

28 Scopus citations

Abstract

In this study Pt nanoparticles supported on NiO, MnO₂, and on carbon black were prepared and tested for the ammonia electrooxidation reaction (AmER) in alkaline media. The morphology and structure of the catalysts were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), x-ray diffraction (XRD), nitrogen physisorption, and their surface properties were studied using synchrotron radiation photoelectron spectroscopy (SRPES). Cyclic voltammetry, chronoamperometry and Tafel plots were used to study the electrochemical behavior of ammonia on Pt/metal oxide catalysts. Pt/NiO showed the highest current density and the lowest onset potential for AmER (-0.48 V vs. Hg/HgO) which increased in the order E_onset(Pt/NiO) < E_onset(Pt/MnO₂) < E_onset(Pt/C). The reaction kinetic order with respect to the concentration of ammonia is close to zero, indicating fast surface adsorption of ammonia in agreement with previous studies on polycrystalline Pt electrodes, whereas the apparent Tafel slopes were found higher (56 − 69 mV dec⁻¹) than previously reported values for Pt (39 mV dec⁻¹). Our results show that the nature of the support strongly influences the size and electronic properties of the Pt nanoparticles, and as a result their electrocatalytic activity for AmER.

Original language	English
Pages (from-to)	1455-1463
Number of pages	9
Journal	Electrochimica Acta
Volume	222
DOIs	https://doi.org/10.1016/j.electacta.2016.11.124
State	Published - Dec 20 2016
Externally published	Yes

Funding

The financial support from the Natural Science and Engineering Research Council (NSERC) is acknowledged. A portion of the research described in this paper was performed at the Canadian Light Source, which is funded by the Canada Foundation for Innovation, NSERC, the National Research Council Canada, the Canadian Institutes of Health Research, the Government of Saskatchewan, Western Economic Diversification Canada, and the University of Saskatchewan.

Funders	Funder number
Government of Saskatchewan
Natural Science and Engineering Research Council
University of Saskatchewan
Canadian Institutes of Health Research
Western Economic Diversification Canada
National Research Council Canada
Canada Foundation for Innovation

Keywords

Ammonia electrooxidation
alkaline electrolyte
nickel oxide
platinum nanoparticles
sacrificial support method

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10.1016/j.electacta.2016.11.124

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title = "Promotion of Ammonia Electrooxidation on Pt nanoparticles by Nickel Oxide Support",

abstract = "In this study Pt nanoparticles supported on NiO, MnO2, and on carbon black were prepared and tested for the ammonia electrooxidation reaction (AmER) in alkaline media. The morphology and structure of the catalysts were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), x-ray diffraction (XRD), nitrogen physisorption, and their surface properties were studied using synchrotron radiation photoelectron spectroscopy (SRPES). Cyclic voltammetry, chronoamperometry and Tafel plots were used to study the electrochemical behavior of ammonia on Pt/metal oxide catalysts. Pt/NiO showed the highest current density and the lowest onset potential for AmER (-0.48 V vs. Hg/HgO) which increased in the order Eonset(Pt/NiO) < Eonset(Pt/MnO2) < Eonset(Pt/C). The reaction kinetic order with respect to the concentration of ammonia is close to zero, indicating fast surface adsorption of ammonia in agreement with previous studies on polycrystalline Pt electrodes, whereas the apparent Tafel slopes were found higher (56 − 69 mV dec−1) than previously reported values for Pt (39 mV dec−1). Our results show that the nature of the support strongly influences the size and electronic properties of the Pt nanoparticles, and as a result their electrocatalytic activity for AmER.",

keywords = "Ammonia electrooxidation, alkaline electrolyte, nickel oxide, platinum nanoparticles, sacrificial support method",

author = "Spyridon Ntais and Alexey Serov and Andersen, {Nalin I.} and Roy, {Aaron J.} and Emily Cossar and Anis Allagui and Zhenzhen Lu and Xiaoyu Cui and Baranova, {Elena A.} and Plamen Atanassov",

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doi = "10.1016/j.electacta.2016.11.124",

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T1 - Promotion of Ammonia Electrooxidation on Pt nanoparticles by Nickel Oxide Support

AU - Ntais, Spyridon

AU - Serov, Alexey

AU - Andersen, Nalin I.

AU - Roy, Aaron J.

AU - Cossar, Emily

AU - Allagui, Anis

AU - Lu, Zhenzhen

AU - Cui, Xiaoyu

AU - Baranova, Elena A.

AU - Atanassov, Plamen

PY - 2016/12/20

Y1 - 2016/12/20

N2 - In this study Pt nanoparticles supported on NiO, MnO2, and on carbon black were prepared and tested for the ammonia electrooxidation reaction (AmER) in alkaline media. The morphology and structure of the catalysts were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), x-ray diffraction (XRD), nitrogen physisorption, and their surface properties were studied using synchrotron radiation photoelectron spectroscopy (SRPES). Cyclic voltammetry, chronoamperometry and Tafel plots were used to study the electrochemical behavior of ammonia on Pt/metal oxide catalysts. Pt/NiO showed the highest current density and the lowest onset potential for AmER (-0.48 V vs. Hg/HgO) which increased in the order Eonset(Pt/NiO) < Eonset(Pt/MnO2) < Eonset(Pt/C). The reaction kinetic order with respect to the concentration of ammonia is close to zero, indicating fast surface adsorption of ammonia in agreement with previous studies on polycrystalline Pt electrodes, whereas the apparent Tafel slopes were found higher (56 − 69 mV dec−1) than previously reported values for Pt (39 mV dec−1). Our results show that the nature of the support strongly influences the size and electronic properties of the Pt nanoparticles, and as a result their electrocatalytic activity for AmER.

AB - In this study Pt nanoparticles supported on NiO, MnO2, and on carbon black were prepared and tested for the ammonia electrooxidation reaction (AmER) in alkaline media. The morphology and structure of the catalysts were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), x-ray diffraction (XRD), nitrogen physisorption, and their surface properties were studied using synchrotron radiation photoelectron spectroscopy (SRPES). Cyclic voltammetry, chronoamperometry and Tafel plots were used to study the electrochemical behavior of ammonia on Pt/metal oxide catalysts. Pt/NiO showed the highest current density and the lowest onset potential for AmER (-0.48 V vs. Hg/HgO) which increased in the order Eonset(Pt/NiO) < Eonset(Pt/MnO2) < Eonset(Pt/C). The reaction kinetic order with respect to the concentration of ammonia is close to zero, indicating fast surface adsorption of ammonia in agreement with previous studies on polycrystalline Pt electrodes, whereas the apparent Tafel slopes were found higher (56 − 69 mV dec−1) than previously reported values for Pt (39 mV dec−1). Our results show that the nature of the support strongly influences the size and electronic properties of the Pt nanoparticles, and as a result their electrocatalytic activity for AmER.

KW - Ammonia electrooxidation

KW - alkaline electrolyte

KW - nickel oxide

KW - platinum nanoparticles

KW - sacrificial support method

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EP - 1463

JO - Electrochimica Acta

JF - Electrochimica Acta

ER -

Promotion of Ammonia Electrooxidation on Pt nanoparticles by Nickel Oxide Support

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