High-performance low-temperature solid oxide fuel cell with novel BSCF cathode

Liu, Q.L.; Khor, K.A.; Chan, Siew Hwa

doi:10.1016/j.jpowsour.2006.03.095

Cited by 201 publications

(85 citation statements)

References 26 publications

(38 reference statements)

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“…5a,b, the core/shell fibre- at 550°C, respectively. The first generation cell had an approximately 9-mm-thick electrolyte, which is similar to the thickness in the study of Liu et al 31 . The fact that, despite the similar electrolyte thickness, higher peak power densities appeared in the first generation cell substantiates the improved performance of the core/shell fibre cathode in terms of oxygen surface exchange.…”

supporting

confidence: 55%

“…In the cathode part, the perovskitetype materials, such as Sm 0.5 Sr 0.5 CoO 3 À d (SSC) 21 and La 0.6 Sr 0.4 Co 1 À x Fe x O 3 À d (LSCF) 22 have been mainly used for low-temperature operation. Shao 23 , and as a consequence, a number of studies have focused on the physical and electrochemical properties of the BSCF cathode depending on its microstructure and composition, as the reaction kinetics on the surface of inorganic materials are specific to their compositions and configurations [24][25][26][27][28][29][30][31][32][33] . In recent years, we confirmed that the nanocomposite Ni-GDC AFL 34 and the core/shell fibre structured BSCF-GDC cathode have positive influences on the cell performance at low temperatures.…”

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confidence: 99%

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Tailoring gadolinium-doped ceria-based solid oxide fuel cells to achieve 2 W cm−2 at 550 °C

2014

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Low-temperature operation is necessary for next-generation solid oxide fuel cells due to the wide variety of their applications. However, significant increases in the fuel cell losses appear in the low-temperature solid oxide fuel cells, which reduce the cell performance. To overcome this problem, here we report Gd 0.1 Ce 0.9 O 1.95 -based low-temperature solid oxide fuel cells with nanocomposite anode functional layers, thin electrolytes and core/shell fibrestructured Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3 À d -Gd 0.1 Ce 0.9 O 1.95 cathodes. In particular, the report describes the use of the advanced electrospinning and Pechini process in the preparation of the core/shell-fibre-structured cathodes. The fuel cells show a very high performance of 2 Wcm À 2 at 550°C in hydrogen, and are stable for 300 h even under the high current density of 1 A cm À 2 . Hence, the results suggest that stable and high-performance solid oxide fuel cells at low temperatures can be achieved by modifying the microstructures of solid oxide fuel cell components.

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confidence: 55%

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confidence: 99%

Tailoring gadolinium-doped ceria-based solid oxide fuel cells to achieve 2 W cm−2 at 550 °C

2014

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“…The authors showed that among these cobaltites and ferrites, BSCF has the lowest surface exchange resistance; for example, electrochemical surface exchange at a BSCF microelectrode was 50 times lower than at a similar LSCF microelectrode. Liu et al [7] compared anode-supported SOFCs based on a Gd 0.2 Ce 0.8 O 1.9 (gadolinia-doped ceria (GDC)) electrolyte 10-μm thick. The authors concluded that a BSCF cathode shows a much lower interfacial polarization resistance at low temperatures (450-600°C) than LSCF-and SSC-based cathodes.…”

Section: Introductionmentioning

confidence: 99%

Composite cathode materials Ag-Ba0.5Sr0.5Co0.8Fe0.2O3 for solid oxide fuel cells

Mosiałek

Dudek

Michna

et al. 2014

J Solid State Electrochem

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Silver-Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ (BSCF) cathodes were prepared in two ways. In the first method, Ag-BSCF composite powder was prepared in ethanol solution, where Ag nanoparticles serving as a component in the preparation of Ag-BSCF composite cathodes had been previously obtained via one-step synthesis in absolute ethanol using a neutral polymer (polyvinylpyrrolidone). To the best of our knowledge, this is the first study to use a Ag sol obtained by the above method for preparation of Ag-BSCF composite powder. Then, a paste containing this powder was screen-printed on a Sm 0.2 Ce 0.8 O 1.9 electrolyte and sintered at 1,000°C. In the second technique, an aqueous solution of AgNO 3 was added to a previously sintered BSCF cathode, which was then sintered again at 800°C. The oxygen reduction reaction at the quasi-point BSCF cathode on the Sm 0.2 Ce 0.8 O 1.9 electrolyte was tested by electrochemical impedance spectroscopy at different oxygen concentrations in three electrode setup. The continuous decrease of polarization resistance was observed under polarization −0.5 V at 600°C. The comparative studies of both obtained composite Ag-BSCF materials were performed in hydrogen-oxygen IT-SOFC involving samariadoped ceria as an electrolyte and Ni-Gd 0.2 Ce 0.8 O 1.9 anode. In both cases, the addition of silver to the cathode caused an increase in current and power density compared with an IT-SOFC built with the same components but involving a monophase BSFC cathode material.

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“…25,26 The high power outputs can be explained by the high ionic conductivity of SDC electrolyte and excellent electrochemical catalytic activity of BSCF cathode for oxygen reduction reaction (ORR) as well as good chemical compatibility between BSCF cathode and SDC electrolyte, as demonstrated by low ohmic resistances and electrode polarization resistances of the cell tested under open circuit condition (Fig. S4, ESIw).…”

Section: Resultsmentioning

confidence: 99%

Solid oxide fuel cells with both high voltage and power output by utilizing beneficial interfacial reaction

Shao

Lin

et al. 2012

Phys. Chem. Chem. Phys.

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An intriguing cell concept by applying proton-conducting oxide as the ionic conducting phase in the anode and taking advantage of beneficial interfacial reaction between anode and electrolyte is proposed to successfully achieve both high open circuit voltage (OCV) and power output for SOFCs with thin-film samarium doped ceria (SDC) electrolyte at temperatures higher than 600 1C. The fuel cells were fabricated by conventional route without introducing an additional processing step. A very thin and dense interfacial layer (2-3 mm) with compositional gradient was created by in situ reaction between anode and electrolyte although the anode substrate had high surface roughness (45 mm), which is, however, beneficial for increasing triple phase boundaries where electrode reactions happen.

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High-performance low-temperature solid oxide fuel cell with novel BSCF cathode

Cited by 201 publications

References 26 publications

Tailoring gadolinium-doped ceria-based solid oxide fuel cells to achieve 2 W cm−2 at 550 °C

Tailoring gadolinium-doped ceria-based solid oxide fuel cells to achieve 2 W cm−2 at 550 °C

Composite cathode materials Ag-Ba0.5Sr0.5Co0.8Fe0.2O3 for solid oxide fuel cells

Solid oxide fuel cells with both high voltage and power output by utilizing beneficial interfacial reaction

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