Fabrication and electrochemical performance of a stable, anode supported thin BaCe0.4Zr0.4Y0.2O3-δ electrolyte Protonic Ceramic Fuel Cell (original) (raw)
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International Journal of Hydrogen Energy, 2018
High performance Ni-BCZYYb cermet anode were prepared at 1300 C using electrolyte powders prepared by combustion and commercial NiO. The cermets are porous (39 vol% of porosity), show a high electronic conductivity (1097 S cm À1) and sufficient mechanical properties. The electrochemical behavior of the Ni-BCZYYb/BZCYYb-ZnO/Ni-BCZYYb symmetrical cell elaborated by co-pressing and co-sintering was investigated using electrochemical impedance spectroscopy. The impedance spectroscopy study show that the electrode reaction involves three steps. The total polarization Area Specific Resistance decreases by about one order of magnitude when increasing the temperature from 450 to 600 C or the H 2 concentration from 5 to 100 vol% to reach 0.049 U cm 2 at 600 C under pure hydrogen.
Journal of Power Sources Advances, 2020
The state-of-the-art protonic ceramic electrolyte BaCe 0.7 Zr 0.1 Y 0.1 Yb 0.1 O 3-δ (BCZYYb) dense films were successfully deposited on the pre-sintered Ni(O)þBCZYYb anode substrate by recently developed rapid laser reactive sintering (RLRS) method. The separation of the deposition of dense electrolyte from the preparation of porous anode makes it possible to manufacture protonic ceramic fuel cells (PCFCs) with more desirable electrolyte and anode microstructures. The PCFC single cells prepared after introducing the cathode thin film BaCo 0.4 Fe 0.4 Zr 0.1 Y 0.1 O 3-δ (BCFZY0.1) showed OCVs of 0.94-0.97V and peak power densities of 97 mW/cm 2 at 600 C and 121 mW/cm 2 at 600-650 C under Air/H 2 gradient. The proton conductivity of the BCZYYb film derived the RLRS-derived single cell showed a moderate proton conductivity of 3.7 Â 10 À3 S/cm at 600 C. The higher PCFC performance can be expected by further optimization of the thickness, compositions, and/or microstructures of the component layers.
International Journal of Hydrogen Energy, 2014
We fabricated a uniquely designed anode-supported-type protonic ceramic fuel cell (PCFC) with a dual-electrolyte layer containing BaCe 0.9 Y 0.1 O 3Àd (BCY) as the higher-protonconducting phase and BaZr 0.85 Y 0.15 O 3Àd (BZY) as the chemically stable protecting phase. In order to overcome the poor sinterability of the BZY electrolytes, which is a critical limitation in making thin and dense dual-electrolyte layers for anode-supported PCFCs, we employed aid-assisted enhanced sintering of BZY by adding 1 mol% of CuO. We also promoted the densification of the BZY layer by utilizing the higher sinterability of BCY that is attached to the top of the BZY layer. By properly adjusting the shrinkage behaviors of both the anode substrate and the dual-electrolyte layers, we were able to fabricate a fairly dense BZY/BCY dual-layer electrolyte with a thickness of less than 20 mm. In this paper, the novel strategies used to fabricate the PCFC based on dual-electrolyte layers are reported.
The aim of this work is to identify suitable cathode materials for SOFCs based on proton-conducting electrolytes (SOFC-H þ) in terms of long-term and thermal cycling stability along with a low polarization resistance. To this purpose a wide variety of materials, well known and new ones, are synthesized and their thermal and chemical compatibility is achieved by the aid of dilatometry study and XRD analysis of the calcined electrode/electrolyte mixtures , respectively. It is found that most of the studied cathodes exhibit significant thermal expansion along with striking chemical interaction with the electrolytes under investigation and despite of their intensive study presented in literature, their applications in H þ-SOFCs is still questionable. On the base of experimental data, LaNi 0.6 Fe 0.4 O 3Àd, La 2 NiO 4þd and Y 0.8 Ca 0.2 BaCo 4 O 7þd electrode materials have been selected for electrical and electrochemical characterization. It is found that bi-layer electrode with Y 0.8 Ca 0.2 BaCo 4 O 7þd functional layer and LaNi 0.6 Fe 0.4 O 3 collector exhibits both the lowest polarization and serial resistances in contact with BaCe 0.8 Y 0.2 O 3Àd electrolyte.