Polarization mechanism of high temperature electrolysis in a Ni–YSZ/YSZ/LSM solid oxide cell by parametric impedance analysis

Shin, Eui-Chol; Ahn, Pyung-An; Seo, Hyun-Ho; Jo, Jung-Mo; Kim, Sundong; Woo, Sang‐Kuk; Yu, Ji Haeng; Mizusaki, Junichiro; Lee, Jong‐Sook

doi:10.1016/j.ssi.2012.10.028

Cited by 71 publications

(58 citation statements)

References 48 publications

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“…Fig. 4 shows a typical Nyquist plot of the tubular single cells at 800 C. The impedance spectrum is fitted according to an LR ohm (R H Q H )(R L Q L ) equivalent circuit model [30,31]. L is an inductance element representing the impedance response caused by the measurement device and connecting wires, while R ohm is the ohmic resistance of the whole single cell.…”

Section: Effect Of Ni Layer Thicknessmentioning

confidence: 99%

“…The above outcomes suggest a significant influence of Ni layer thickness on both R ohm and R p of the single cells. One plausible explanation for this phenomenon is that a reduced sheet resistance of the Ni layer favors the transport of electrons in the anode layer, which facilitates the charge transfer process of the anode and lowers the overall electrode polarization of the single cells [31].…”

Section: Effect Of Ni Layer Thicknessmentioning

confidence: 99%

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Performance improvement of inert-substrate-supported tubular single cells via microstructure modification

Zhao

Kim

et al. 2015

Journal of Power Sources

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Section: Effect Of Ni Layer Thicknessmentioning

confidence: 99%

Section: Effect Of Ni Layer Thicknessmentioning

confidence: 99%

Performance improvement of inert-substrate-supported tubular single cells via microstructure modification

Zhao

Kim

et al. 2015

Journal of Power Sources

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“…2e. The circuit has been suggested to be more realistic stray impedance model [8,48]. The presence of a small series resistance similarly leads to the third universal "superlinear" behavior (σ ∼ ω 2 ) observed at frequencies as high as GHz and THz [49].…”

Section: Resultsmentioning

confidence: 99%

A comprehensive treatment of universal dispersive frequency responses in solid electrolytes by immittance spectroscopy: low temperature AgI case

Moon

Cho

Nguyen

et al. 2015

J Solid State Electrochem

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Motivated by the recent work on β -alumina polycrystalline ceramics, we revisit the frequency dispersion behavior of AgI. Series of admittance and capacitance Bode plots at different temperatures revealed the presence of well-defined parallel capacitance effects and powerlaw frequency dependencies. Non-trivial bulk dispersion is thus successfully described by the bulk conductance with activation energy of 0.262 eV in parallel connection to several capacitive effects: (i) a mobile-charge contribution, universally observed in many solid electrolytes, approximated by a Cole-Davidson model with C ∼ = 28, γ C ∼ =0.388, and (τ C ) −1 thermally activated by 0.237 eV, (ii) a dipolar and vibratory contribution represented by another Cole-Davidson model of the dielectric strength of D ∼ = 9.0 with γ D ∼ =0.110, τ D ∼ =0.003 s, corresponding to Nearly-Constant-Loss behavior, and (iii) high frequency limit capacitance corresponding to the dielectric constant S ∼ =6.4. Electrode effects are described by an ideal Warburg response and the coefficient activated by 0.165 eV, which is connected in parallel to the bulk capacitive elements (i) to (iii). The modeling allows a simulation of ac behavior of AgI as a function of temperature as well as frequencies, addressing all of the universally observed dispersive responses.

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“…641 eV and the presence of the shake-up shoulder at ca. 647 eV lead to the unambiguous identification of the presence of MnO at the electrode [40,41,43,46,47].…”

Section: In Situ Xps and Nexafsmentioning

confidence: 99%

An in situ near-ambient pressure X-ray Photoelectron Spectroscopy study of Mn polarised anodically in a cell with solid oxide electrolyte

Bozzini

Amati

Bocchetta

et al. 2015

Electrochimica Acta

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This paper reports an in situ study of the anodic behavior of a model solid oxide electrolysis cell (SOEC) by means of near-ambient pressure X-ray Photoelectron Spectroscopy (XPS) combined with near edge X-ray absorption fine structure (NEXAFS) measurements. The focus is on the anodic surface chemistry of MnO_x, a model anodic material already considered in cognate SOFC-related studies, during electrochemical operation in CO₂, CO₂/H₂O and H₂O ambients. The XPS and NEXAFS results we obtained, complemented by electrochemical measurements and SEM characterisation, reveal the chemical evolution of Mn under electrochemical control. MnO is the stable chemical form at open-circuit potential (OCP), while Mn₃O₄ forms under anodic polarisation in all the investigated gas ambients. Carbon deposits are present on the Mn electrode at OCP, but they are readily oxidised under anodic conditions. Prolonged operation of the MnO_x anode leads to pitting of the Mn films, damaging of the triple-phase boundary region and also to formation of discontinuities in the Mn patch. This is accompanied by chemical transformations of the electrolyte and formation of ZrC without impact on the surface chemistry of the Mn-based anode

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Polarization mechanism of high temperature electrolysis in a Ni–YSZ/YSZ/LSM solid oxide cell by parametric impedance analysis

Cited by 71 publications

References 48 publications

Performance improvement of inert-substrate-supported tubular single cells via microstructure modification

Performance improvement of inert-substrate-supported tubular single cells via microstructure modification

A comprehensive treatment of universal dispersive frequency responses in solid electrolytes by immittance spectroscopy: low temperature AgI case

An in situ near-ambient pressure X-ray Photoelectron Spectroscopy study of Mn polarised anodically in a cell with solid oxide electrolyte

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