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@INPROCEEDINGS{Edeh:1019773,
      author       = {Edeh, Obinna and Schäfer, Dominik and Eichel, Rüdiger-A.
                      and Kunz, Felix},
      title        = {{D}etecting atypical {O}peration at {S}olid-{O}xide {C}ells
                      {S}tack using a nonlinear {AC} {T}echnique: {T}otal
                      {H}armonic {D}istortion ({THD}).},
      school       = {RWTH Aachen},
      reportid     = {FZJ-2023-05604},
      year         = {2023},
      abstract     = {This study aims to explore the possibility of utilizing a
                      nonlinear AC-based approach known as total harmonic
                      distortion (THD) to monitor the operation of temperature
                      solid oxide cell (SOC) stacks during the co-electrolysis of
                      steam and CO2 for synthesis gas (syngas, a mixture of H2 and
                      CO) production. The THD technique enables the online
                      measurement of nonlinearities in electrochemical devices,
                      providing an effective way to track certain performance
                      changes. Like electrochemical impedance spectroscopy (EIS),
                      the THD technique involves probing an electrochemical system
                      with an excitation signal of a given frequency and amplitude
                      and recording the response signal. But contrary to EIS,
                      non-linear system responses are evaluated.This research will
                      complement THD analysis with conventional techniques such as
                      polarization curves, EIS, and distribution of relaxation
                      time (DRT) to interpret the obtained data. The research will
                      be carried out with a short stack in the Juelich F10 design
                      employing fuel-electrode-supported cells with a substrate
                      and fuel electrode. The THD parameters such as AC amplitude
                      signal, direct current, harmonic orders, and frequencies
                      that provide suitable fault detectability will be
                      established. In this work, the nonlinear response of solid
                      oxide electrolysis cells (SOEC) stacks resulting from high
                      gas conversion at high current density and reactant
                      starvation will be investigated.Previous research indicates
                      that THD technique can detect early signs of degradation in
                      solid oxide fuel cells (SOFC), which is essential for
                      applying mitigation strategies to prevent irreversible
                      damage in SOFC. However, the application of THD techniques
                      to monitor the operation of high-temperature SOC stacks
                      during co-electrolysis for syngas production is lacking in
                      the literature. This study will be essential for future
                      research involving the use ofTHD technique in monitoring
                      degradation and optimizing SOC stack performance
                      andespecially for power-to-syngas process.},
      month         = {Sep},
      date          = {2023-09-25},
      organization  = {International Conference on
                       Fundamentals $\&$ Development of Fuel
                       Cells FDFC Ulm 2023., Ulm (Germany), 25
                       Sep 2023 - 27 Sep 2023},
      subtyp        = {Other},
      cin          = {IEK-9},
      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)6},
      url          = {https://juser.fz-juelich.de/record/1019773},
}