Neodymium nickelate Nd2-xSrxNi1-yCoyO4 ± d (x and y = 0 or 0.05) as cathode materials for the oxygen reduction reaction

M. Ferkhi, M. Rekaik, A. Khaled, M. Cassir, Jean-Jacques Pireaux

Résultats de recherche: Contribution à un journal/une revueArticle

Résumé

The oxygen reduction reaction (ORR) was investigated using two new cathode materials based on neodymium nickelate with formula Nd2-xSrxNi1-yCoyO4 ± δ (with x and y = 0 or 0.05) prepared by the citrate method. The ORR was measured in 0.5 M NaOH with a rotating disk electrode (RDE) at different rotation speeds after purging with pure oxygen. The synthesized materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS), whereas the electrochemical analysis was obtained by linear voltammetry and impedance spectroscopy. The results show that before the ORR, the grains of the undoped material are spherical in shape with a size around 400 nm, while after the oxygen reduction reaction, the grain size increases. In the doped material, on the contrary, the results are reversed and the grain size becomes smaller. In addition, we show that the ORR mechanism proceeds in a single step in the undoped material while it is carried out in two successive steps in the case of the doped one. XPS analysis confirms that the sites responsible for the ORR are the OH groups. Doping with Sr or Co does not improve the electrochemical properties: this dopant adversely affects the formation of the sites responsible for the dissociation of molecular oxygen. For larger hydroxide groups content (2.30, Nd2NiO4 ± δ) the electrochemical currents are much greater relative to that of the other Nd1.95Sr0.05Ni0.95Co0.05O4 ± δ (0.98) material. This work helps to understand the role of OH groups, and the reduction mechanisms with 2 and 4 electrons.

langueAnglais
Pages281-290
Nombre de pages10
journalElectrochimica Acta
Volume229
Les DOIs
étatPublié - 1 mars 2017

Empreinte digitale

Neodymium
Cathodes
Oxygen
X ray photoelectron spectroscopy
Doping (additives)
Purging
Molecular oxygen
Rotating disks
Voltammetry
Electrochemical properties
Citric Acid
Spectroscopy
X ray diffraction
Scanning electron microscopy
Electrodes
Electrons

mots-clés

    Citer ceci

    @article{7d869b6682674451b839215ae4af811f,
    title = "Neodymium nickelate Nd2-xSrxNi1-yCoyO4 ± d (x and y = 0 or 0.05) as cathode materials for the oxygen reduction reaction",
    abstract = "The oxygen reduction reaction (ORR) was investigated using two new cathode materials based on neodymium nickelate with formula Nd2-xSrxNi1-yCoyO4 ± δ (with x and y = 0 or 0.05) prepared by the citrate method. The ORR was measured in 0.5 M NaOH with a rotating disk electrode (RDE) at different rotation speeds after purging with pure oxygen. The synthesized materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS), whereas the electrochemical analysis was obtained by linear voltammetry and impedance spectroscopy. The results show that before the ORR, the grains of the undoped material are spherical in shape with a size around 400 nm, while after the oxygen reduction reaction, the grain size increases. In the doped material, on the contrary, the results are reversed and the grain size becomes smaller. In addition, we show that the ORR mechanism proceeds in a single step in the undoped material while it is carried out in two successive steps in the case of the doped one. XPS analysis confirms that the sites responsible for the ORR are the OH− groups. Doping with Sr or Co does not improve the electrochemical properties: this dopant adversely affects the formation of the sites responsible for the dissociation of molecular oxygen. For larger hydroxide groups content (2.30, Nd2NiO4 ± δ) the electrochemical currents are much greater relative to that of the other Nd1.95Sr0.05Ni0.95Co0.05O4 ± δ (0.98) material. This work helps to understand the role of OH− groups, and the reduction mechanisms with 2 and 4 electrons.",
    keywords = "Electrochemical behavior, Impedance spectroscopy, Nickelate materials, ORR, XPS analysis",
    author = "M. Ferkhi and M. Rekaik and A. Khaled and M. Cassir and Jean-Jacques Pireaux",
    year = "2017",
    month = "3",
    day = "1",
    doi = "10.1016/j.electacta.2017.01.023",
    language = "English",
    volume = "229",
    pages = "281--290",
    journal = "Electrochimica Acta",
    issn = "0013-4686",
    publisher = "Elsevier Limited",

    }

    Neodymium nickelate Nd2-xSrxNi1-yCoyO4 ± d (x and y = 0 or 0.05) as cathode materials for the oxygen reduction reaction. / Ferkhi, M.; Rekaik, M.; Khaled, A.; Cassir, M.; Pireaux, Jean-Jacques.

    Dans: Electrochimica Acta, Vol 229, 01.03.2017, p. 281-290.

    Résultats de recherche: Contribution à un journal/une revueArticle

    TY - JOUR

    T1 - Neodymium nickelate Nd2-xSrxNi1-yCoyO4 ± d (x and y = 0 or 0.05) as cathode materials for the oxygen reduction reaction

    AU - Ferkhi,M.

    AU - Rekaik,M.

    AU - Khaled,A.

    AU - Cassir,M.

    AU - Pireaux,Jean-Jacques

    PY - 2017/3/1

    Y1 - 2017/3/1

    N2 - The oxygen reduction reaction (ORR) was investigated using two new cathode materials based on neodymium nickelate with formula Nd2-xSrxNi1-yCoyO4 ± δ (with x and y = 0 or 0.05) prepared by the citrate method. The ORR was measured in 0.5 M NaOH with a rotating disk electrode (RDE) at different rotation speeds after purging with pure oxygen. The synthesized materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS), whereas the electrochemical analysis was obtained by linear voltammetry and impedance spectroscopy. The results show that before the ORR, the grains of the undoped material are spherical in shape with a size around 400 nm, while after the oxygen reduction reaction, the grain size increases. In the doped material, on the contrary, the results are reversed and the grain size becomes smaller. In addition, we show that the ORR mechanism proceeds in a single step in the undoped material while it is carried out in two successive steps in the case of the doped one. XPS analysis confirms that the sites responsible for the ORR are the OH− groups. Doping with Sr or Co does not improve the electrochemical properties: this dopant adversely affects the formation of the sites responsible for the dissociation of molecular oxygen. For larger hydroxide groups content (2.30, Nd2NiO4 ± δ) the electrochemical currents are much greater relative to that of the other Nd1.95Sr0.05Ni0.95Co0.05O4 ± δ (0.98) material. This work helps to understand the role of OH− groups, and the reduction mechanisms with 2 and 4 electrons.

    AB - The oxygen reduction reaction (ORR) was investigated using two new cathode materials based on neodymium nickelate with formula Nd2-xSrxNi1-yCoyO4 ± δ (with x and y = 0 or 0.05) prepared by the citrate method. The ORR was measured in 0.5 M NaOH with a rotating disk electrode (RDE) at different rotation speeds after purging with pure oxygen. The synthesized materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS), whereas the electrochemical analysis was obtained by linear voltammetry and impedance spectroscopy. The results show that before the ORR, the grains of the undoped material are spherical in shape with a size around 400 nm, while after the oxygen reduction reaction, the grain size increases. In the doped material, on the contrary, the results are reversed and the grain size becomes smaller. In addition, we show that the ORR mechanism proceeds in a single step in the undoped material while it is carried out in two successive steps in the case of the doped one. XPS analysis confirms that the sites responsible for the ORR are the OH− groups. Doping with Sr or Co does not improve the electrochemical properties: this dopant adversely affects the formation of the sites responsible for the dissociation of molecular oxygen. For larger hydroxide groups content (2.30, Nd2NiO4 ± δ) the electrochemical currents are much greater relative to that of the other Nd1.95Sr0.05Ni0.95Co0.05O4 ± δ (0.98) material. This work helps to understand the role of OH− groups, and the reduction mechanisms with 2 and 4 electrons.

    KW - Electrochemical behavior

    KW - Impedance spectroscopy

    KW - Nickelate materials

    KW - ORR

    KW - XPS analysis

    UR - http://www.scopus.com/inward/record.url?scp=85011004819&partnerID=8YFLogxK

    U2 - 10.1016/j.electacta.2017.01.023

    DO - 10.1016/j.electacta.2017.01.023

    M3 - Article

    VL - 229

    SP - 281

    EP - 290

    JO - Electrochimica Acta

    T2 - Electrochimica Acta

    JF - Electrochimica Acta

    SN - 0013-4686

    ER -