An Efficient Electron-Blocking Interlayer Induced by Metal Ion Diffusion for SOFC Based on Y-Doped Ceria Electrolyte

ACS Applied Materials & Interfaces
Jiafeng CaoYuexia Ji

Abstract

To suppress the internal electronic leakage at ceria-based electrolyte, a novel electron-blocking layer consisting of doped BaCe0.8Y0.2O3-δ was fabricated in situ at the interface of Ba-containing anode and Y-doped ceria electrolyte. The anode-supported full cell based on Y0.2Ce0.8O1.9 (YDC20) electrolyte presents a remarkable peak power density of 814 mW/cm2 as well as an open-circuit voltage of 1.0 V at 650 °C, which are much higher than those of the cells with Gd0.1Ce0.9O1.95 (GDC10) electrolyte (453 mW/cm2 at 650 °C) and BaCe0.8Y0.2O3-δ|Y0.2Ce0.8O1.9 (BCY|YDC20) bilayered electrolyte (419 mW/cm2 at 650 °C). The efficient promotion of the electron-blocking interlayer with high oxygen ionic conductivity is considered as the main reason for the improved performance of YDC20-based solid oxide fuel cell. The composition and the microstructure of the electron-blocking interlayer are further analyzed by scanning electron microscope and transmission electron microscope characterizations.

References

Nov 20, 2001·Nature·B C Steele, A Heinzel
Sep 10, 2004·Nature·Zongping Shao, Sossina M Haile
Jul 24, 2008·Chemical Society Reviews·Daniel J L BrettStephen J Skinner
Sep 8, 2010·Chemical Society Reviews·Emiliana FabbriEnrico Traversa
Nov 19, 2011·Science·Eric D Wachsman, Kang Taek Lee

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