Incorporation of a proton into La0.9Sr0.1(Yb1−Mx)O3−δ (M= Y, In)

The performance of protonic ceramic fuel cells (PCFCs) using thin film BaCe 0.6 Zr 0.2 Y 0.2 O 3-δ (BCZY622) electrolyte has been studied. The reference cell with the La 0.8 Sr 0.2 MnO 3-δ cathode and Ni anode showed poor performance and short-term degradation. The overpotential of the anode and ohmic loss were the major factors for degradation, and a solid solution of Ni in the BCZY electrolyte has been observed. The electrical conductivity and the proton concentration of BCZY and BCZY622 doped with 5wt% NiO were measured by an impedance analysis and thermogravimetric analysis. The electrical conductivity and the proton concentration of BCZY622 decreased by introducing NiO. To avoid short-term degradation, the cell construction, manufacturing process, and cathode materials were improved. As a result, a carefully designed PCFC with thin film BCZY622, Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ cathode and Ni/BCZY622 cermet anode showed good power density of 200-300mW/cm 2 in the wide temperature range of 873 -1073K, and had stable power generation.

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“…In a previous study [13,[15][16][17][18], we suggested that the partial oxygen vacancies cannot take part in the hydration. •…”

Section: Ni Addition Effect On the Conductivity And Proton Concentrationmentioning

confidence: 88%

Improvement of Protonic Ceramic Fuel Cells with Thin Film BCZY Electrolyte

et al. 2015

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“…Their properties were studied for the first time by Iwahara and his group [9][10][11]. Since their pioneer investigations, many works on perovskite as proton conducting electrolyte are reported in recent years for intermediate temperature fuel cell or steam electrolysis [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical studies of water insertion and proton – Ceramic interaction in substituted perovskite SrZr 0.9 Ln 0.1 O 2.95

Lacroix¹,

Rahmouni²,

Sirat³

et al. 2014

Journal of Power Sources

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Because of their high ionic conduction even at relatively low temperatures, proton conducting ceramics are one of the most promising electrolytes for fuel cell. In contrast to oxide-ion conductors, proton-conducting systems, especially in an electrolyser plant, could operate below 600°C, critical temperature for mechanical and hot corrosion resistance of common stainless steels. Proton conduction in perovskite type ceramic was analyzed under the water molecules insertion to maximize proton conduction. To this end, the SrZr 0.9 Ln 0.1 O 2.95 electrolyte and its microstructure, particularly grain size was investigated. The insertion and release of water in the perovskite structure was followed by impedance spectroscopy and by using the so-called Brick Layer Model (BLM) to separate the bulk and grain boundary conductivities. It was found that the conductivity in both zones increases namely with steam pressure. It was also verified that the bulk conductivity is higher than that of grain boundaries. Consequently both the operating steam pressure and the grain size appear as the main parameters that can be tuned to enhance the proton conduction.

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“…However, the maximum proton concentration could not reach the dopant level and was dependent on the mixture ratio of the cation on the B-site. In our previous study, lanthanum-based perovskite oxides have a characteristic proton concentration [6,9]. Kreuer reported that the low saturation limits are explained by the decay of two oxygen sites with different affinities toward the hydration reaction [10].…”

Section: Resultsmentioning

confidence: 94%

“…We consider the hydration energy based on the assumption that the partial oxygen vacancies cannot take part in the hydration in the same manner as described in a previous study [5,6,9]. In the present system, the electrical neutrality condition is expressed as follows: denote the oxygen vacancy involved in the hydration and the immobile oxygen ion which do not take part in hydration, respectively.…”

Section: ••mentioning

confidence: 99%