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@INPROCEEDINGS{Ma:902322,
      author       = {Ma, Qianli and Fang, Qingping and Guillon, Olivier and
                      Menzler, Norbert H.},
      title        = {{L}a({C}o, {N}i, {F}e){O}3 air-electrode for solid-oxide
                      cells, from powder to stack},
      reportid     = {FZJ-2021-04179},
      year         = {2021},
      abstract     = {La(Co, Ni, Fe)O3 air-electrode for solid-oxide cells, from
                      powder to stackQianli Ma,*a Qingping Fang,a Olivier
                      Guillon,a,b Norbert H. Menzler aa Forschungszentrum Jülich
                      GmbH, Institute of Energy and Climate Research (IEK),
                      D-52425 Jülichb Jülich Aachen Research Alliance,
                      JARA-Energy, D-52425 Jülich, Germany* E-mail:
                      q.ma@fz-juelich.de Although the-state-of-the-art
                      La1-xSrxFe1-yCoyO3 (LSCF) and La1-xSrxCoO3 (LSC) are mature
                      air-electrodes for solid oxide cells (SOCs, including solid
                      oxide fuel cells and solid oxide electrolysis), the
                      continuous depletion of strontium in LSCF or LSC during
                      operation of SOCs leads to deterioration of electrical
                      conductivity and electrocatalytic activity of the
                      air-electrode. It also causes detachment of the contact
                      between the air-electrodes and the metallic interconnects
                      used in SOC stacks. Therefore it is worth to search for
                      alternative air-electrode materials. Among the possible
                      candidates of Sr-free air-electrode materials, the system
                      LaCoO3-LaNiO3-LaFeO3 shows high attractiveness because they
                      have SOC-compatible physical properties, good
                      electrochemical performance and chemical stability against
                      chromium oxyhydroxides released from the metallic
                      interconnects used in SOC stacks. [1]Based on the results
                      obtained on the perovskites in the quasi-ternary system of
                      LaFeO3-LaCoO3-LaNiO3,[1] A-site deficient La0.97Ni0.5Co0.5O3
                      (LNC97) is selected as the further optimized composition,
                      which has an electronic conductivity of over 1000 S cm-1 at
                      800oC. [2] Compatibility of LNC97 with 8 $mol\%$ Y2O3
                      stabilized ZrO2 (8YSZ) is analyzed and compared with that of
                      La0.58Sr0.4Co0.8Fe0.2O3-δ (LSCF) and 8YSZ. According to the
                      requirements of the air electrode materials with qualified
                      performance, i.e. 1) high electronic conductivity, 2) high
                      ionic conductivity, and 3) high catalytic activity for the
                      oxygen reduction reaction, LNC97 based electrodes are
                      modified, characterized and optimized by symmetric cell
                      tests. Mechanisms for explaining the electrode-processes of
                      LNC97-based electrodes are raised.[2] Full cells based on
                      optimized LNC97 air-electrode were tested under both fuel
                      cell mode and electrolyzer mode. Mid-term operation of about
                      1000 h for SOCs in both modes primarily proved the stability
                      of LNC97-based air electrodes. Impedance spectra were
                      systematically applied to understand the polarization
                      processes of the cells.[3] A stack based on LNC97 air
                      electrode was also built and a long-term operation of 4000 h
                      was investigated under fuel cell mode. The performance is
                      comparable to the state-of-the-art LSCF air electrode based
                      SOC stacks, and the degradation rate is as low as $0.9\%$
                      kh-1, indicating a prospective future for the developed
                      material and the relative SOCs. References[1] F. Tietz, I.
                      ArulRaj, Q. Ma, S.Baumann, A.Mahmoud, R.P.Hermann, J. Solid
                      State Chem. 237 (2016) 183–191.[2] Q. Ma, M. Balaguer, D.
                      Pérez-Coll, L. G. J. de Haart, J. M. Serra, G. C. Mather,
                      F. Tietz, N. H. Menzler, O. Guillon. ACS Appl. Energy Mater.
                      1 (2018) 2784−2792.[3] Q Ma, S Dierickx, V Vibhu, D
                      Sebold, LGJ de Haart, A Weber, O Guillon, NH Menzler, J.
                      Electrochem. Soc., 167 (2020) 084522.},
      month         = {Nov},
      date          = {2021-11-07},
      organization  = {6th Asian SOFC Symposium and
                       Exhibition, Jeju (South Korea), 7 Nov
                       2021 - 9 Nov 2021},
      subtyp        = {Video},
      cin          = {IEK-1 / JARA-ENERGY},
      cid          = {I:(DE-Juel1)IEK-1-20101013 / $I:(DE-82)080011_20140620$},
      pnm          = {1232 - Power-based Fuels and Chemicals (POF4-123)},
      pid          = {G:(DE-HGF)POF4-1232},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/902322},
}