Application of in-situ Raman scattering spectroscopy for stress condition measurement in solid oxide fuel cells

Iguchi, Fumitada; Onuki, S.; Shimizu, Makoto; Kawada, Tatsuya; Yugami, Hiroo

doi:10.2109/jcersj2.16275

Cited by 3 publications

(4 citation statements)

References 23 publications

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“…On the other hand, in-operando or in situ monitoring requires suitable probes for high temperature measurements. Raman spectroscopy has been used to analyze in situ interfacial and electrode processes in solid oxide fuel cells (SOFCs), as well as oxygen activity or stress in different layers of the cell, [17][18][19][20][21] by monitoring the Raman spectra of GDC in the electrolyte or the composite electrode. Specifically designed cells and systems were used by these authors to have optical access to the electrodes or to the region near the electrode-electrolyte interface.…”

mentioning

confidence: 99%

Probing High Oxygen Activity in YSZ Electrolyte

Robles¹,

Orera²,

Peña³

et al. 2022

J. Electrochem. Soc.

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The redox behavior of terbium and praseodymium doped yttria-stabilized zirconia (YSZ) was studied with the aim of identifying spectroscopic probes and a suitable experimental procedure to monitor the oxygen activity in YSZ electrolytes in solid oxide cells with spatial resolution and at operation conditions (e.g. at high temperatures). Sintered ceramics and crystals with 0.3 to 10 at% content of Pr or Tb ions in YSZ were prepared. Upon equilibration in atmospheres from 10-20 to 100 bar PO2 around 800ºC, the majority of these rare earth ions are in the 3+ oxidation state. At oxygen pressures above 0.001 bar, the small proportion of Tb4+ and Pr4+ formed give rise to intense optical absorption around 300-500 nm and to decreased reflectance. From the reflectance measurements it is shown that the Tb4+ concentration increases as PO2 1/4, as correspond to the trapping of the holes generated upon the oxygen incorporation as Tb4+. This competitive absorption causes a decrease of the Tb3+ luminescence. A quantitative relationship of the Tb3+ luminescence intensity with PO2 at 800ºC has been found, which is compatible with the trapping model. The spatial resolution of the experimental procedure could be very roughly estimated of the order of 100 μm

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mentioning

confidence: 99%

Probing High Oxygen Activity in YSZ Electrolyte

Robles¹,

Orera²,

Peña³

et al. 2022

J. Electrochem. Soc.

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“…Additionally, Raman scattering spectroscopy was performed to con rm the crystal structure of the YSZ-Frame specimens because the yttria stabilized zirconia has three crystal symmetries: namely monoclinic, tetragonal, and cubic, in accordance with its yttrium concentration. The details of a measurement setup and the apparatus were explained elsewhere 20) .…”

Section: Methodsmentioning

confidence: 99%

“…Furthermore, the change of the defect structure also causes volume changes, which make strain and stress analyses in SOFCs and SOECs more dif cult than in automobiles and airplanes at high operating temperatures and for small cell sizes. Despite the rapid progress of computational mechanics nowadays, experimental observation of strain and stress is still required in the front line of solid state ionics [19][20][21][22][23][24] .…”

Section: Introductionmentioning

confidence: 99%

Influence of NiO Reduction on Residual Strain in NiO/Ni-YSZ

2018

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The residual strains in the composites of nickel oxide (NiO) and yttria-stabilized zirconia (YSZ) and in the cermets of reduced nickel (Ni) and YSZ, which were used as anodes for solid oxide fuel cells (SOFCs), were measured using X-ray diffraction. The in uence of Ni reduction on the residual strain was evaluated. Tensile and compressive residual strains caused by thermal strain were observed in NiO and YSZ phases, respectively. They clearly depended on the volume fraction of NiO and YSZ, and changed proportionally. The YSZ phase in the Ni-YSZ cermets also showed a similar dependence on the volume fraction of NiO. The compressive strain increased as the NiO increased; however, a local maximum was observed for NiO 50 vol%, beyond which it decreased with increasing amount of NiO. Compressive strain in the YSZ phase in the Ni-YSZ with NiO of 60 vol%, which is a common volume fraction of SOFC anodes, was only 30% of that in the NiO-YSZ. Plastic deformation of the Ni phase near the interfaces, and relaxation of the compressive strain in the YSZ phase were responsible for this phenomenon. This revealed the difference in the residual strain in the YSZ phase after reduction.

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“…Raman shift varies with both oxygen non-stoichiometric property and mechanical strain. Iguchi et al carried out Raman spectral measurements of SDC in SOFC intermediate layers at high temperatures (5).…”

Section: Introductionmentioning

confidence: 99%

Comparison of Residual Stress Measurement Methods in Solid Oxide Fuel Cell

et al. 2021

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We performed in-situ measurement of residual stress in an anode-supported cell using sin2 ψ method, cosα method, and Raman scattering spectroscopy. Residual stress at room temperature was evaluated by the sin2 ψ method, cosα method, and simulation. The stress values were generally consistent among the methods, with YSZ having a compressive stress of around 600 MPa. Residual stress analysis at high temperatures was attempted using Raman scattering spectroscopy which, however, was difficult to be applied above 700˚C. Instead, cosα method was successfully utilized for the measurement of residual stress during the temperature rise, reduction, and re-oxidation processes. The stress on the electrolyte observed during reduction and re-oxidation was different from that expected with a simple assumption of layered homogeneous sheets. These results showed that the cosα method is the most suitable method for in-situ measurements to validate simulated stress states.

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Application of in-situ Raman scattering spectroscopy for stress condition measurement in solid oxide fuel cells

Cited by 3 publications

References 23 publications

Probing High Oxygen Activity in YSZ Electrolyte

Probing High Oxygen Activity in YSZ Electrolyte

Influence of NiO Reduction on Residual Strain in NiO/Ni-YSZ

Comparison of Residual Stress Measurement Methods in Solid Oxide Fuel Cell

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