The diffusions and associated interfacial layer formation between thin film electrolyte and cermet anode in IT-SOFC

Li, Zhipeng; Mori, Toshiyuki; Auchterlonie, Graeme; Zou, Jin; Drennan, John; Miyayama, Masaru

doi:10.1016/j.jallcom.2011.07.080

Cited by 10 publications

(12 citation statements)

References 30 publications

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“…More amount of the Zr, Sc component was detected on the GDC side than that of the Ce, Gd component detected on the SSZ side. It is different from the mutual diffusion of Ni and Ce ions reported by Li et al [18,20,22], the behavior observed here is onedirectional diffusion from electrolyte, although the diffusion is quite short in length. The results is also different with the literature in which an equal diffusion length of Zr and Ce was ever observed [26].…”

Section: Cell Testcontrasting

confidence: 99%

Asymmetric diffusion of Zr, Sc and Ce, Gd at the interface between zirconia electrolyte and ceria interlayer for solid oxide fuel cells

Liang

Tao

Zhang

et al. 2016

Journal of Alloys and Compounds

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Section: Cell Testcontrasting

confidence: 99%

Asymmetric diffusion of Zr, Sc and Ce, Gd at the interface between zirconia electrolyte and ceria interlayer for solid oxide fuel cells

Liang

Tao

Zhang

et al. 2016

Journal of Alloys and Compounds

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“…Based on the prior researches, 16,17,[22][23][24] the thickness of interfacial layer h inter is only 2 nm to 1 μm, far less than that of electrolyte h 1 and anode h 2 , ie, h inter < <h 1 and h inter < <h 2 ( Figure 2A). Combining the constituent analysis of the interfacial layer that the concentrations of the Ni and YSZ grains vary linearly, we assume that the constituent distribution in the interfacial layer is homogeneous and the volume fractions of Ni and YSZ in the interfacial layer are the mean value of that in anode and electrolyte, respectively ( Figure 2C).…”

Section: Formation Mechanism Of Interfacial Layermentioning

confidence: 96%

“…Hydrogen is supplied as fuel to SOFC, and the air provides oxygen for the reaction. 16,17,[22][23][24] The formation mechanism of interfacial layer is due to the mutual diffusion of grains in the electrode and electrolyte during the working process of SOFC, and the corresponding schematic diagram of the interfacial layer between anode and electrolyte is shown in Figure 2B. The YSZ is served as the electrolyte for it possesses high ionic conductivity, low electron conductivity, good compactness, great thermal compatibility, and high material strength.…”

Section: Formation Mechanism Of Interfacial Layermentioning

confidence: 99%

“…Based on this method, the thermal mechanical behavior of interface between the semiinfinite film was investigated by Lee et al, 11 and Suhir 12 used the Bessel functions. The interface diffusion of Ni from anode to electrolyte was observed experimentally by Zhang et al, 15 and the micromorphology of the interfacial layer was investigated through scanning electron microscope by Maffei et al 16 and Li et al 17 The interfacial thermal stress was predicted by Liu et al 18 to estimate the interfacial fracture behavior of SOFC, and the material property of the interfacial layer was assumed to be the average value between anode and electrolyte. The other method is that the thermal stress is calculated by assuming the layer as the Timoshenko beam and establishing the equilibrium equation.…”

Section: Introductionmentioning

confidence: 99%

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The analysis of interfacial thermal stresses of solid oxide fuel cell applied for submarine power

2018

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Summary Solid oxide fuel cell (SOFC) due to its high energy conversion rate and low noise can replace diesel energy as the submarine power. The interface thermal stress has an important effect on the stabilization and endurance of SOFC. The thermomechanical model of SOFC, which takes the interfacial layer into account, is developed to analyze the interfacial thermal stresses between electrodes and electrolyte in this paper. Based on the formation mechanism and composition distribution of the interfacial layer and the stress analysis of the half‐cell system, the material property of the interfacial layer is determined and the interfacial thermal stress is expressed accurately. The finite element model of SOFC is employed to investigate the interfacial thermal stress, and the simulated result agrees well with the theoretical result. The modified expressions of interfacial thermal stresses for numerical result are given to analyze the difference between theoretical and simulated results at the free edge of SOFC. The anode‐electrolyte interface needs to be concerned because its thermal stress level is higher and more likely to fail and partially delaminate compared with that of cathode‐electrolyte interface. In addition, the optimization scheme with respect to the interfacial layer thickness is obtained and the interfacial thermal stress decreases with the increase of the interfacial layer thickness. The research provides guidance for determining and minimizing the interfacial thermal stresses of SOFC.

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“…In the case of the single cell consisting of GDC electrolyte, NiO‐GDC cermet anode, and La 0.6 Sr 0.4 Co 0.8 Fe 0.2 O 3 (LSCF) cathode, the formation of a characteristic super‐structure assigned as C‐type rare‐earth structures was observed at the interface between GDC and LSCF . In addition, similar C‐type rare‐earth‐related defect structures were formed at GDC/cermet anode interfaces . The aforementioned microanalysis study suggests that the oxide interfacial layer reduces the activity of three‐phase boundaries (TPBs), leading to a sluggish overall performance of the SOFC.…”

Section: Introductionmentioning

confidence: 99%

Design of Active Sites on Nickel in the Anode of Intermediate‐Temperature Solid Oxide Fuel Cells using Trace Amount of Platinum Oxides

et al. 2018

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In recent years, the lowering of the operation temperature of solid oxide fuel cells (SOFCs) has attracted much attention owing to the trade‐off between the best performance and the life span of SOFCs. For this challenge, new active sites on the Ni surfaces in a Nickel–Yttria‐Stabilized Zirconia (Ni‐YSZ) cermet anode of SOFCs have been created by deposition of trace amounts of platinum oxide (PtOx) followed by an activation step of the anode at 1073 K in a hydrogen flow. The internal resistance (IR) free value (185 mA cm−2 at 0.8 V) observed for the single cell with an anode sputtered with a trace amount of PtOx (Pt content in anode: from 9 to 91 ppm) at 973 K is conspicuously higher than that of a similar single cell with a nonsputtered cermet anode (85 mA cm−2) at 0.8 V and 1073 K. Transmission electron microscopy microanalysis shows that the defect structure is formed on a partially oxidized Ni surface by active Pt species. Also, surface atomistic simulation on NiO (111) predicts the formation of Frenkel defect clusters with Pt cations, which partially cover the Ni surface. The formation of Frenkel defect clusters on the partially oxidized Ni surface (i.e., creation of new active sites for formation of water molecules) promotes the anode reaction, resulting in improvements in the anode performance of SOFC single cells at 973 K. Design of the aforementioned new active sites on Ni through sputtering of trace amounts of PtOx provides a great opportunity for “radical innovation” in the design of intermediate‐temperature SOFCs.

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The diffusions and associated interfacial layer formation between thin film electrolyte and cermet anode in IT-SOFC

Cited by 10 publications

References 30 publications

Asymmetric diffusion of Zr, Sc and Ce, Gd at the interface between zirconia electrolyte and ceria interlayer for solid oxide fuel cells

Asymmetric diffusion of Zr, Sc and Ce, Gd at the interface between zirconia electrolyte and ceria interlayer for solid oxide fuel cells

The analysis of interfacial thermal stresses of solid oxide fuel cell applied for submarine power

Design of Active Sites on Nickel in the Anode of Intermediate‐Temperature Solid Oxide Fuel Cells using Trace Amount of Platinum Oxides

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