Validating the efficiency of γ-Al2O3/La0.6Sr0.4Co0.2Fe0.8O3-δ double-layer electrolyte for low temperature solid oxide fuel cell. (18th November 2021)

• Record Type: Journal Article
• Authors: Zhou, Xiaomi; Zheng, Dan; Xia, Chen; Wang, Xunying; Dong, Wenjing; Zhu, Bin; Wang, Baoyuan
• Is Part Of: International journal of hydrogen energy. Volume 46:Number 80(2021)
• Page Start: 40014
• Page End: 40021
• Publication Date: 2021-11-18
• Subjects: Double-layer electrolyte -- Semiconductor-ionic conductor powder -- Electron barrier layer -- Low temperature solid oxide fuel cell -- Band energy alignment; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2021.09.255
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Perovskite La0.6 Sr0.4 Co0.2 Fe0.8 O3+δ (LSCF) as a promising cathode material possessed overwhelming electronic conduction along with certain ionic conductivity. Its strong electron conduction capability hinder the application of pure-phase LSCF as electrolyte in semiconductor membrane fuel cell (SMFC). In order to constrain the electron transport and take advantage of the decent ion conduction of LSCF, a thin layer of γ-Al2 O3 with insulating property was added as an electron barrier layer and combine with LSCF to form a two-layer structure electrolyte. Through adjusting the weight ratio of LSCF/γ-Al2 O3 to optimize the thickness of double layers, an open circuit voltage of 0.98 V and a maximum power density of 690 mW/cm 2 was received at 550 °C. At the same time, SEM, EIS and other characterization technology had proven that the LSCF/γ-Al2 O3 bi-layer electrolyte can work efficiently at low temperature. The advantage of this work is the application of double-layer (γ-Al2 O3 /LSCF) structure electrolyte to instead of mixed material electrolyte in low-temperature solid oxide fuel cells. Structural innovation and the using of insulating materials provided clues for the further development of SMFC. Highlights: This work proposes new bi-layer electrolyte in low-temperature solid oxide fuel cell. Wide band gap oxide γ-Al2 O3 is used as an electron barrier layer. The short-circuit phenomenon of LSCF as an electrolyte in low-temperature solid oxide fuel cells has been improved. The device avoids high temperature sintering and can still obtain good performance. The lower operating temperature eliminates the thermal matching between the bi-layer electrolyte.