Electrochemical properties of micro-tubular intermediate temperature solid oxide fuel cell with novel asymmetric structure based on BaZr0.1Ce0.7Y0.1Yb0.1O3−δ proton conducting electrolyte. (21st June 2019)

• Record Type: Journal Article
• Authors: Chen, Changcheng; Dong, Yuan; Li, Long; Wang, Zhanmin; Liu, Mingfei; Rainwater, Ben H.; Bai, Yaohui
• Is Part Of: International journal of hydrogen energy. Volume 44:Number 31(2019)
• Page Start: 16887
• Page End: 16897
• Publication Date: 2019-06-21
• Subjects: BaZr0.1Ce0.7Y0.1Yb0.1O3−δ electrolyte -- Proton conducting -- Micro-tubular cells -- Phase-inversion -- Asymmetric structure -- Concentration polarization; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2019.04.264
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: This study employed a simple phase-inversion method to achieve anode-supported micro-tubular solid oxide fuel cells on the basis of the BaZr0.1 Ce0.7 Y0.1 Yb0.1 O3−δ proton conducting electrolyte. The typical cell with configuration of Ni–BaZr0.1 Ce0.7 Y0.1 Yb0.1 O3−δ |BaZr0.1 Ce0.7 Y0.1 Yb0.1 O3−δ |La0.6 Sr0.4 Co0.2 Fe0.8 O3-δ -Sm0.2 Ce0.8 O2-δ . The novel "sponge-like micro-pores electrode | homogeneous porous functional layer" asymmetric pore structure is obtained. Achieved results include: i) the electrodes revealed the single phase collected by the powder X-Ray Diffractometer analysis; ii) observed by Scanning Electron Microscope, the single cell presenting uniform distribution of micro sponge-like pores electrode was well-adhered to the dense and crack-free 12 μm thick electrolyte layer; iii) the cells showed excellent electrochemical performance with the maximum power densities of 1.070, 0.976, 0.815, and 0.700 W cm −2 at 750, 700, 650 and 600 °C, respectively, characterized by Electrochemical Impedance Spectroscopy; iv) the designed cell clearly indicated a very low concentration polarization value (0.01 and 0.02 Ω cm 2 at 750 and 700 °C). Our findings provide a promising approach to improve intermediate temperature solid oxide fuel cells performance by optimizing the electrode-electrolyte interface microstructure, based on proton and oxide ion mixed conductor electrolytes. Graphical abstract: Image 1 Highlights: "Sponge-like micro-pores electrode | homogeneous porous functional layer" structure. Very low concentration polarization values (0.01 and 0.02 Ω cm 2 at 750 and 700 °C). 6% improvement power outputs vs. planar cells based on BZCYYb electrolyte at 600 °C. 111–136% improvement power outputs vs. similar tubular cells at 600–700 °C.