A novel cobalt–free La0.5Ba0.5Fe0.95Mo0.05O3– electrode for symmetric solid oxide fuel cell

Characterization of Pr0.5A0.5Fe0.9W0.1O3−δ (A = Ca, Sr and Ba) as symmetric electrodes for solid oxide fuel cells

“…Many studies have shown that partial substitution of Fe on the B-site with high valence elements can improve the phase stability under both reducing and oxidizing atmospheres. 3,[13][14][15][16][17][18][19][20][21] For instance, W-doping has been demonstrated in our previous studies and other reports. 16,22 The electrochemical performance of perovskite oxides depends on the doping level of the A and/or B-site.…”

“…Many studies have shown that partial substitution of Fe on the B-site with high valence elements can improve the phase stability under both reducing and oxidizing atmospheres. 3,13–21 For instance, W-doping has been demonstrated in our previous studies and other reports. 16,22…”

“…Generally, two electrodes with different materials have different functions and must meet the basic requirements. 2,3 Due to the different electrode materials, at least two steps are required to fabricate a single cell, which increases the manufacturing cost. In addition, the chemical and thermomechanical compatibility problems at the two interfaces between the anode/electrolyte and cathode/electrolyte are also complicated.…”

Fe-Doped Ba0.9K0.1FexCo1–xO3−δ Perovskite Cathode Material for Low-Temperature Solid Oxide Fuel Cells

“…We observed the conversion from Co 4+ /Fe 4+ to Co 3+ /Fe 3+ when T < 700 °C, and once T > 700 °C, the Co 3+ /Fe 3+ is converted to Co 2+ / Fe 2+ . 37,38 Although the BKF 0.6 C sample has a slightly lower initial temperature of oxygen release, the peak area of the BKF 0.5 C sample is larger than that of the BKF 0.6 C sample, which indicates that more oxygen vacancies can be generated in the BKF 0.5 C sample and higher oxygen ion mobility can be obtained. 39 It was found that only the peak of Co 4+ /Fe 4+ was transformed into Co 3+ /Fe 3+ below 600 °C, which demonstrated that the oxygen ion transport in the working process of the cell mainly came from the transformation of +4 → +3 valence ions and the creation of oxygen vacancies (Figure 3b*).…”

LSCF–WO3 semiconductor composite electrolytes for low-temperature solid oxide fuel cells

“…[19][20][21] Most of these SIC-based SOFCs could output a maximum power density higher than 700 mW cm −2 at a temperature of about 550 °C when the content of semiconductors in SICs was appropriate. [22][23][24] Interestingly, although a large amount of semiconductors (20-40%) exist in the electrolyte layer, there is no short circuit problem for the device, and the corresponding open circuit voltages (OCVs) of the fuel cell were higher than 1.0 V. Some studies even reported LTSOFC with semiconductor as an electrolyte and also showed OCVs higher than 1.0 V. 9,25,26 Various mechanisms have been proposed to explain this phenomenon. [27][28][29][30] Zhu et al 29 ascribed this to the formation of Schottky junction at the interface of the anode and electrolyte layers.…”