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@ARTICLE{Unachukwu:909980,
      author       = {Unachukwu, Ifeanyichukwu D. and Vibhu, Vaibhav and Vinke,
                      Izaak C. and Eichel, Rüdiger-A. and de Haart, L. G. J.},
      title        = {{S}r {S}ubstituted {L}a2−x{S}rx{N}i0.8{C}o0.2{O}4+δ (0
                      ≤ x ≤ 0.8): {I}mpact on {O}xygen {S}toichiometry and
                      {E}lectrochemical {P}roperties},
      journal      = {Energies},
      volume       = {15},
      number       = {6},
      issn         = {1996-1073},
      address      = {Basel},
      publisher    = {MDPI},
      reportid     = {FZJ-2022-03569},
      pages        = {2136 -},
      year         = {2022},
      abstract     = {Lanthanide nickelate Ln2NiO4+δ (Ln = La, Pr, or Nd) based
                      mixed ionic and electronic conducting (MIEC) materials have
                      drawn significant attention as an alternative oxygen
                      electrode for solid oxide cells (SOCs). These nickelates
                      show very high oxygen diffusion coefficient (D*) and surface
                      exchange coefficient (k*) values and hence exhibit good
                      electrocatalytic activity. Earlier reported results show
                      that the partial substitution of Co2+ at B-site in
                      La2Ni1−xCoxO4+δ (LNCO) leads to an enhancement in the
                      transport and electrochemical properties of the material.
                      Herein, we perform the substitution at A-site with Sr, i.e.,
                      La2−xSrxNi0.8Co0.2O4+δ, in order to further investigate
                      the structural, physicochemical, and electrochemical
                      properties. The structural characterization of the
                      synthesized powders reveals a decrease in the lattice
                      parameters as well as lattice volume with increasing Sr
                      content. Furthermore, a decrease in the oxygen over
                      stoichiometry is also observed with Sr substitution. The
                      electrochemical measurements are performed with the
                      symmetrical half-cells using impedance spectroscopy in the
                      700–900 °C temperature range. The total polarization
                      resistance of the cell is increased with Sr substitution.
                      The electrode reaction mechanism is also studied by
                      recording the impedance spectra under different oxygen
                      partial pressures. Finally, the kinetic parameters are
                      investigated by analyzing the impedance spectra under
                      polarization. A decrease in exchange current density (i0) is
                      observed with increasing Sr content.},
      cin          = {IEK-9},
      ddc          = {620},
      cid          = {I:(DE-Juel1)IEK-9-20110218},
      pnm          = {1232 - Power-based Fuels and Chemicals (POF4-123)},
      pid          = {G:(DE-HGF)POF4-1232},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000776824000001},
      doi          = {10.3390/en15062136},
      url          = {https://juser.fz-juelich.de/record/909980},
}