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@INPROCEEDINGS{Dwivedi:912380,
      author       = {Dwivedi, Shivam Kumar and Schäfer, Laura-Alena and Zeng,
                      Yuan and Ivanova, Mariya and Guillon, Olivier and Menzler,
                      Norbert H. and Kumar, Ravi},
      title        = {{F}abrication and electrochemical performance of an air
                      electrode {B}a{C}o0.4{F}e0.4{Z}r0.2{O}3- δ composite in
                      proton-conducting electrolysis cells},
      reportid     = {FZJ-2022-05571},
      year         = {2022},
      abstract     = {Proton conducting fuel and electrolysis cells (PCF/ECs)
                      emerge as a technology energy conversion (gas to power) and
                      reliable large-scale electricity storage in the form of
                      hydrogen gas (power to gas). The fabrication of proton
                      conducting electrolysis cells is associated with numerous
                      constraints arising during the fabrication and operation,
                      such as electrode layer cracking, delamination, and warpage
                      due to thermo-chemical mismatching. According to Løken,
                      this mismatch should not exceed $50\%$ to avoid thermal
                      stress leading to cracks and delamination [1]. Forming a
                      cer-cer or a cer-met composite of the electrode and the
                      electrolyte is a common way to address these issues. Hence,
                      in the present work we focus on the development and the
                      electrochemical characterization of an air electrode cer-cer
                      composite by direct mixing of BaCo0.4Fe0.4Zr0.2O3-δ
                      (BCFZ442) and BaZr0.7Ce0.2Y0.1O3-δ (BZCY721) powders in
                      various ratios (50:50, 70:30, and 90:10 wt $\%$ ,
                      respectively). We examined their chemical compatibility at
                      various sintering temperatures through X-ray diffraction
                      analysis. We then screen-printed the so-prepared air
                      electrode composite pastes on both sides of sintered BZCY721
                      pellets serving as the electrolyte, thus forming symmetric
                      cells after sintering the electrodes. The cross-sectional
                      scanning electron microscopic (SEM) views collected on the
                      symmetrical cell before and after the operation/measurements
                      showed a good adherence between the electrolyte and the
                      electrode and an electrode/electrolyte interface with a
                      porous structure, availing the accessible path for gas
                      diffusion. The electrochemical impedance of the symmetrical
                      cells was measured from 400-700 oC at 50 oC intervals by
                      Impedance spectroscopy with wet air $(3\%$ H2O) in the
                      frequency range of 0.1 Hz to 1 MHz. The total cell
                      resistance, which represents the polarization and ohmic
                      resistance, decreases as expected with the temperature
                      increases and it was studied as a function of the electrode
                      composition as well.[1] Løken Andreas, Ricote Sandrine,
                      Wachowski Sebastian, Thermal and chemical expansion in
                      proton ceramic electrolytes and compatible electrodes,
                      Crystals, 8(9), 365 (2018)},
      month         = {Nov},
      date          = {2022-11-13},
      organization  = {76th Annual Technical Meeting of
                       Indian Institute of Metals, Ramoji Film
                       City, Hyderabad (India), 13 Nov 2022 -
                       16 Nov 2022},
      subtyp        = {After Call},
      cin          = {IEK-1},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {1231 - Electrochemistry for Hydrogen (POF4-123) / 1222 -
                      Components and Cells (POF4-122)},
      pid          = {G:(DE-HGF)POF4-1231 / G:(DE-HGF)POF4-1222},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/912380},
}