Impedance spectroscopy study of gadolinia-doped ceria

Albinsson, Ingvar; Mellander, Bengt-Erik

doi:10.1007/bf02375852

Cited by 5 publications

(4 citation statements)

References 14 publications

(19 reference statements)

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“…S3), the high-frequency (HF) process R 1 , with peak frequency ranging within 50-8000 Hz, shows an asymmetrical shape, a small resistance contribution and negligible temperature dependence over the range 600-800°C. In the work of Zhu et al, such a high-frequency process appeared only when certain metal current collectors were applied [73], while Oh and Haile [57] and Nielsen et al [56] suggest that this HF feature could represent the interfacial resistance between CGO and YSZ.…”

Section: Eis and Morphology Of Conventional Electrodesmentioning

confidence: 98%

Model-guided design of a high performance and durability Ni nanofiber/ceria matrix solid oxide fuel cell electrode

Ouyang

Bertei

Cooper

et al. 2021

Journal of Energy Chemistry

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Mixed ionic electronic conductors (MIECs) have attracted increasing attention as anode materials for solid oxide fuel cells (SOFCs) and they hold great promise for lowering the operation temperature of SOFCs. However, there has been a lack of understanding of the performance-limiting factors and guidelines for rational design of composite metal-MIEC electrodes. Using a newly-developed approach based on 3D-tomography and electrochemical impedance spectroscopy, here for the first time we quantify the contribution of the dual-phase boundary (DPB) relative to the three-phase boundary (TPB) reaction pathway on real MIEC electrodes. A new design strategy is developed for Ni/gadolinium doped ceria (CGO) electrodes (a typical MIEC electrode) based on the quantitative analyses and a novel Ni/CGO fiber-matrix structure is proposed and fabricated by combining electrospinning and tape-casting methods using commercial powders. With only 11.5 vol% nickel, the designer Ni/CGO fiber-matrix electrode shows 32% and 67% lower polarization resistance than a nano-Ni impregnated CGO scaffold electrode and conventional cermet electrode respectively. The results in this paper demonstrate quantitatively using real electrode structures that enhancing DPB and hydrogen kinetics are more efficient strategies to enhance electrode performance than simply increasing TPB.

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Section: Eis and Morphology Of Conventional Electrodesmentioning

confidence: 98%

Model-guided design of a high performance and durability Ni nanofiber/ceria matrix solid oxide fuel cell electrode

Ouyang

Bertei

Cooper

et al. 2021

Journal of Energy Chemistry

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“…The high frequency (HF) process R1 at 8000-50hz shows an asymmetrical feature, it shows a strong dependence on temperature changing from 600-700°C, the resistance value is 0.039, 0.065, 0.08 Ωcm 2 at 600°C, 700°C and 800°C, respectively. According to literatures, it appeared only when certain metal current collector was applied (31), also other literatures suggests it shows the interfacial resistance of CGO scaffold and YSZ electrolyte (32). Therefore, can generally be attributed to the contact resistance caused by electrical constriction between current collector and electrodes or electrodes and electrolyte.…”

Section: Morphologymentioning

confidence: 99%

Design of Fibre Ni/CGO Anode and Model Interpretation

et al. 2019

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A new structure of Ni/gadolinium-doped ceria (CGO) is prepared by a highly tuneable and facile combination of electrospinning and tape-casting method. The structure consists of a network made by continuous Ni fibres and filled in with CGO matrices. When used as the anode of solid oxide fuel cell (SOFC), though it has a lower triple phase boundary (TPB) density, it exhibits better performance compared with impregnated and cermet Ni/CGO with higher nickel loading. An algorithm is developed to determine the ceria-pore double phase boundary (DPB) density with different distance from nickel phase. Using the results, the relative electrochemical reaction rate on DPB and TPB of three different electrodes are calculated and proves that fibre-matrices structure has the morphology advantage of efficiently making use of all ceria-pore DPB. The relative contribution of DPB and TPB in anode reaction of SOFC is quantified in the first time and the importance of DPB is further stressed. This work provides new inspirations in material design of SOFC/SOEC and develops a novel strategy to evaluate the performance of electrodes quantitatively.

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“…The Ga doping in ceria gives the higher oxygen diffusion coefficient than ceria doped with other dopants such as Y, Sm, and La 22 . More importantly, evidences of proton conduction at temperature lower than 400 °C were also reported 23 24 25 26 . The mixed oxygen ion and proton-conducting property allows both the oxygen ions and protons to transfer into the GDC layer, and therefore it is likely to extend the water formation and evolution zone from the confined TPB lines ( Fig.…”

mentioning

confidence: 79%

Proton-conducting Micro-solid Oxide Fuel Cells with Improved Cathode Reactions by a Nanoscale Thin Film Gadolinium-doped Ceria Interlayer

Wang

2016

Sci Rep

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An 8 nm-thick gadolinium-doped ceria (GDC) layer was inserted as a cathodic interlayer between the nanoscale proton-conducting yttrium-doped barium zirconate (BZY) electrolyte and the porous platinum cathode of a micro-solid oxide fuel cell (μ-SOFC), which has effectively improved the cathode reaction kinetics and rendered high cell power density. The addition of the GDC interlayer significantly reduced the cathodic activation loss and increased the peak power density of the μ-SOFC by 33% at 400 °C. The peak power density reached 445 mW/cm2 at 425 °C, which is the highest among the reported μ-SOFCs using proton-conducting electrolytes. The impressive performance was attributed to the mixed protonic and oxygen ionic conducting properties of the nano-granular GDC, and also to the high densities of grain boundaries and lattice defects in GDC interlayer that favored the oxygen incorporation and transportation during the oxygen reduction reaction (ORR) and the water evolution reaction at cathode.

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Impedance spectroscopy study of gadolinia-doped ceria

Cited by 5 publications

References 14 publications

Model-guided design of a high performance and durability Ni nanofiber/ceria matrix solid oxide fuel cell electrode

Model-guided design of a high performance and durability Ni nanofiber/ceria matrix solid oxide fuel cell electrode

Design of Fibre Ni/CGO Anode and Model Interpretation

Proton-conducting Micro-solid Oxide Fuel Cells with Improved Cathode Reactions by a Nanoscale Thin Film Gadolinium-doped Ceria Interlayer

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