A simulation study on electrochemical properties of Bi-layered electrolytes GDC(Gd0.1Ce0.9O1.95)/YSZ(Y0.16Zr0.84O1.92), ESB(Er0.4Bi1.6O3)/GDC and ESB/YSZ with different layer thickness fractions in solid oxide fuel cells. (26th July 2019)

• Record Type: Journal Article
• Authors: Wang, Zhentao; Zeng, Yanwei; Li, Chuanming; Ye, Zhupeng; Zhang, Yuan
• Is Part Of: International journal of hydrogen energy. Volume 44:Number 36(2019)
• Page Start: 20389
• Page End: 20403
• Publication Date: 2019-07-26
• Subjects: Solid oxide fuel cells -- Bi-layered electrolytes -- Maximum power density -- Chemical stability -- Interfacial oxygen partial pressure; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2019.06.024
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: The electrochemical properties of bi-layered electrolytes GDC(Gd0.1 Ce0.9 O1.95 )/YSZ(Y0.16 Zr0.84 O1.92 ), ESB(Er0.4 Bi1.6 O3 )/GDC and ESB/YSZ with different layer thickness fractions in the temperature range from 400 to 800 °C have been investigated by simulating calculations based on a charge transport continuity equation and the characteristic conductivity parameters of YSZ, GDC and ESB. It has been found that the model cells with ESB/GDC and ESB/YSZ bi-layered electrolytes can render a higher maximum power density that increases with the ESB layer thickness than those with GDC/YSZ bi-layered electrolytes in the studied temperature range. While the oxygen partial pressure at the interface of ESB/GDC is much lower than that of ESB/YSZ electrolyte with the same ESB thickness fraction, a higher interfacial oxygen partial pressure than the critical decomposition value of Bi2 O3 can be achieved in the ESB/YSZ electrolytes even with small YSZ thickness fractions. This result strongly suggests that the ESB/YSZ, instead of ESB/GDC, would be a thermodynamic stable bi-layered electrolyte with high output power density for potential applications in the intermediate to low temperature SOFCs. Highlights: SOFC models with bi-layered electrolytes GDC/YSZ, ESB/GDC and ESB/YSZ are developed. Reasonable characteristic conductivity parameters of YSZ, GDC and ESB are obtained. Interfacial oxygen partial pressures of ESB/GDC and ESB/YSZ are figured out. A best design of chemically stable bi-layered oxide electrolyte is given.