Investigation of oxide ion flux at cathode/electrolyte interface in solid oxide fuel cell

Nagasawa, Tsuyoshi; Hanamura, Katsunori

doi:10.1016/j.jpowsour.2018.12.013

Cited by 15 publications

(17 citation statements)

References 24 publications

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“…[44] On GDC-based electrodes the active region may extents inside to the whole volume of the electrode [46] while on perovskite LSM 22-31 % of overall electrochemical reaction occurs at the electrode/electrolyte interface and the rest inside the electrode above it. [47] It has been previously shown that the overpotential can be directly measured by XPS without the need of a reference electrode. [48][49-51] B.W.…”

Section: Electrode Polarization In 100% H 2 O Environmentmentioning

confidence: 99%

Revising the role of chromium on the surface of perovskite electrodes: Poison or promoter for the solid oxide electrolysis cell performance?

Chen

Mewafy

Paloukis

et al. 2020

Journal of Catalysis

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Section: Electrode Polarization In 100% H 2 O Environmentmentioning

confidence: 99%

Revising the role of chromium on the surface of perovskite electrodes: Poison or promoter for the solid oxide electrolysis cell performance?

Chen

Mewafy

Paloukis

et al. 2020

Journal of Catalysis

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“…Solid oxide electrolysis cells (SOECs) are regarded as one of the most promising energy conversion systems for sustainable and green energy development. , Great attention has been paid to electrode surface and electrode/electrolyte interface behaviors such as elemental interdiffusion, ionic migration, and surface enrichment, which play important roles in the performance of SOECs. − However, the solid-state electrode/electrolyte interface is difficult to investigate because of its buried state. Up to now, various advanced characterization techniques have been used to study the changes at the interface. − For example, Sr segregation and migration to the interface between the La 0.8 Sr 0.2 Co 0.2 Fe 0.8 O 3−σ (LSCF) electrode and yttria-stabilized zirconia (YSZ) electrolyte can be accelerated by cathodic polarization but inhibited by anodic polarization, which was observed by ex situ scanning transmission electron microscopy .…”

Section: Introductionmentioning

confidence: 99%

External Voltage-Induced Restructuring of the Solid-State Electrode/Electrolyte Interface Revealed by X-ray Photoelectron Spectroscopy Depth Profiling Analysis

Chen,

Ning,

Pei

et al. 2024

ACS Appl. Mater. Interfaces

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Solid/solid interfaces between electrodes and electrolytes play an important role in all-solid-state energy devices, while microscopic investigations of the buried interfaces remain challenging. Here, we construct metal|yttria-stabilized zirconia (YSZ)|Au model cells consisting of a metal film cathode (metal (M) = Au, Ni, and Ag), a single crystalline YSZ electrolyte, and a Au film anode, and use quasi in situ X-ray photoelectron spectroscopy depth profiling analysis to investigate the restructuring of buried interfaces between metal cathodes and YSZ. After applying 2.9 V at 500 °C, interfacial Zr 4+ ions in the electrolyte are reduced and then interdiffuse with metal cathode overlayers, forming a miscible ZrM alloy interlayer. The interface restructuring degree follows the sequence of Au|YSZ|Au > Ni|YSZ|Au > Ag|YSZ|Au. Meanwhile, surface segregation of Zr on the cathode surface is also observed, whose degree follows the sequence of Ag|YSZ|Au > Ni|YSZ|Au > Au|YSZ|Au. Notably, the strong ZrM alloy formation enhances the interface restructuring but suppresses the Zr surface segregation. This work provides a fundamental understanding of the interfacial reaction at the buried electrode/electrolyte interface.

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“…Experimental studies [ 8 ] have shown that the interface between the interconnect and the electrode is an important factor affecting the degradation of SOCs; the interface contact resistance between the interconnect and the electrode may lead to excessive resistive power loss in SOCs. Such interface resistance may arise from chemical reactions between electrode and interconnect, [ 8,9 ] enrichment of strontium between electrode and interconnect, chromium poisoning at electrode side, [ 10 ] etc. The contact between the electrode and the interconnect is usually not optimal, [ 11 ] because each contacting surface inherently has a roughness, and this results in the actual contact area being less than that given by the geometric size of the single cell.…”

Section: Introductionmentioning

confidence: 99%

Interface Evolution of Solid Oxide Cells between the Electrode and the Interconnect Rib Induced with Applied Current

et al. 2022

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Herein, the interface evolution of solid oxide cells (SOCs) on the interfacial contact resistance (ICR) between the electrode and the interconnect rib at different current densities is quantitatively studied using a stainless steel 430 (SUS430)/(La,Sr) (Co,Fe)O3 (LSCF)/SUS430 sandwich structure. To simulate the actual operation of SOCs, different current densities (200, 400, 600, 800, and 1000 mA cm−2) are applied to the sandwich structure by an external power supply and a DC electronic load. Experimental results show that, under an isothermal condition for 1012 h and a thermal cycling condition for 15 times, ICR is smaller when the current density is increased. This phenomenon may be due to the softening of the oxide film on the SUS430 interconnect rib and an increase in the contact area between the SUS430 interconnect rib and the electrode LSCF. Additionally, the microstructure, surface roughness, and contact theory are analyzed in detail. The results indicate that interface contact between the electrode and the interconnect rib may be improved with suitable applied current. This work provides the understanding of possible interface evolution of SOCs induced with applied current.

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Investigation of oxide ion flux at cathode/electrolyte interface in solid oxide fuel cell

Cited by 15 publications

References 24 publications

Revising the role of chromium on the surface of perovskite electrodes: Poison or promoter for the solid oxide electrolysis cell performance?

Revising the role of chromium on the surface of perovskite electrodes: Poison or promoter for the solid oxide electrolysis cell performance?

External Voltage-Induced Restructuring of the Solid-State Electrode/Electrolyte Interface Revealed by X-ray Photoelectron Spectroscopy Depth Profiling Analysis

Interface Evolution of Solid Oxide Cells between the Electrode and the Interconnect Rib Induced with Applied Current

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