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In-situ redox cycling behaviour of Ni-BaZr0.85Y0.15O3−δ cermet anodes for Protonic Ceramic Fuel Cells

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Wang,  Zhu-Jun
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Willinger,  Marc Georg
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Nasani, N., Wang, Z.-J., Willinger, M. G., Yaremchenko, A. A., & Fagg, D. P. (2014). In-situ redox cycling behaviour of Ni-BaZr0.85Y0.15O3−δ cermet anodes for Protonic Ceramic Fuel Cells. International Journal of Hydrogen Energy, 39(34), 19780-19788. doi:10.1016/j.ijhydene.2014.09.136.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0024-5E33-2
Abstract
The current work investigates the redox behaviour of peak performing Ni-BaZr0.85Y0.15O3−δ (Ni-BZY) cermet anodes for protonic ceramic fuel cells (PCFCs) by electrochemical impedance measurements, scanning electron microscopy (SEM) and X-ray diffraction (XRD). Peak performing PCFC cermet anodes are documented to require much lower porosity levels than those needed in oxide-ion conducting counterparts. The polarisation behaviour of these optimised PCFC anodes is shown to be drastically impaired by redox cycling, with depletions in performance that correspond to around 80% of the original resistance values noted after the first redox cycle. The ohmic resistance (Rohmic) is also shown to be increased due to delamination at the electrode/electrolyte interface, as confirmed by postmortem microstructural analysis. In-situ measurements by environmental scanning electron microscopy (ESEM) reveal that degradation proceeds due to volume expansion of the nickel phase during the re-oxidation stage of redox cycling. The present study reveals degradation to be very fast for peak performing Ni-BZY cermets of low porosity. Hence, methods to improve redox stability can be considered to be essential before such anodes can be implemented in practical devices.