Highly efficient and robust cathode materials for low-temperature solid oxide fuel cells: PrBa0.5Sr0.5Co2−xFexO5+δ

Choi, Sihyuk; Yoo, Seonyoung; Kim, Jiyoun; Park, Seonhye; Jun, Areum; Sengodan, Sivaprakash; Kim, Junyoung; Shin, Jeeyoung; Jeong, Hu Young; Choi, YongMan; Kim, Guntae; Liu, Meilin

doi:10.1038/srep02426

Cited by 328 publications

(236 citation statements)

References 35 publications

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“…Lowering the operating temperature of SOFCs to intermediate range (500-800 C) offers many advantages such as prolonged lifetime, flexible choice of cell materials, shortened start-up time, reduced materials cost which might open new opportunity for SOFCs applications on auxiliary power units for vehicles, remote power supplies, portable electronic appliance powering, etc [3][4][5][6][7]. However, the conducting species encounter higher activation barriers at lower temperature, and the oxygen reduction reaction (ORR) kinetics occurred at cathode side became the primary challenge to achieve high performance of SOFCs at reduced operation temperature [4,8].…”

Section: Introductionmentioning

confidence: 99%

Enhanced oxygen reduction activity on surface-decorated perovskite La 0.6 Ni 0.4 FeO 3 cathode for solid oxide fuel cells

Ding

Zhu

Hua

et al. 2015

Electrochimica Acta

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Section: Introductionmentioning

confidence: 99%

Enhanced oxygen reduction activity on surface-decorated perovskite La 0.6 Ni 0.4 FeO 3 cathode for solid oxide fuel cells

Ding

Zhu

Hua

et al. 2015

Electrochimica Acta

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“…Despite the numerous studies on each part (anode, cathode and electrolyte), high-performance LT-SOFCs, especially ceriabased LT-SOFCs [35][36][37][38] , have been rarely reported with few exceptions: Wachsman et al 4 39 and Choi et al 40 and Park et al 41 recently reported over 1.2 W cm À 2 at 550°C in a cell with a PrBa 0.5 Sr 0.5 Co 1.5 Fe 0.5 O 5 þ d (PBSCF05) cathode. Here, we report an original cell design, the core/shell-fibre-structured BSCF-GDC cathode | thin GDC electrolyte | nanocomposite Ni-GDC AFL | Ni-GDC anode fuel cell to achieve high and stable performance GDC-based LT-SOFCs.…”

mentioning

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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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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“…1,2 However, the low operating temperature gives rise to poor activity for the oxygen reduction reaction (ORR) at the cathode. Accordingly, the development of cathode materials with high electro-catalytic activity and excellent durability is necessary for commercialization of IT-SOFCs.…”

mentioning

confidence: 99%

Scale-Down and Sr-Doping Effects on La₄Ni₃O_10-δ–YSZ Nanocomposite Cathodes for IT-SOFCs

Kim

Choi

Jun

et al. 2014

J. Electrochem. Soc.

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Among the Ruddlesden-Popper series, La n+1 Ni n O 3n+1 (n = 1, 2, and 3) has attracted tremendous attention as an intermediate temperature solid oxide fuel cell (IT-SOFC) cathode because of its favorable properties for realizing high performance. Inter alia, La 4 Ni 3 O 10-δ (n = 3) has in particular gained recognition as a promising cathode material owing to its high electrical conductivity and cell performance in IT-SOFC applications. The fabrication of nano-sized La 4 Ni 3 O 10-δ composites requires a low sintering temperature process because high sintering temperature gives rise to solid state reactions between the constituents, which leads to the formation of an undesired electrical insulator and the formation of a low surface area thin-film on the surface. The infiltration method is therefore chosen to fabricate nano-sized La 4 Ni 3 O 10-δ composites because it can provide reduced particle size of La 4 Ni 3 O 10-δ by separating the sintering process of the cathode from the high temperature sintering process of the electrolyte. In this work, we investigated the electrochemical properties of La 4 Ni 3 O 10-δ composites prepared by an infiltration method in terms of application as an IT-SOFC cathode material as well as the effect of strontium doping at La sites. A fuel cell converts chemical energy to electrical energy by using hydrogen or hydrocarbon as fuel. Inter alia, a solid oxide fuel cell (SOFC) is a promising power generation device with high efficiency, excellent performance, low emissions, and attractive fuel flexibility at high operating temperature. Nevertheless, high operating temperature gives rise to some drawbacks such as interface reactions between cell components, electrode phase transitions, restrictions on choice of materials, and so on. The key to solving those problems lies in developing intermediate-temperature SOFCs (IT-SOFCs) (500-700• C). 1,2However, the low operating temperature gives rise to poor activity for the oxygen reduction reaction (ORR) at the cathode. Accordingly, the development of cathode materials with high electro-catalytic activity and excellent durability is necessary for commercialization of IT-SOFCs. [3][4][5] In this respect, mixed ionic electronic conductors (MIECs) based on transition metal (e.g. Mn, Fe, Co, and Ni) oxides have received remarkable attention. 3,4,6 MIECs have the capability to conduct oxygen ions and electrons simultaneously, which leads to an increase of electrochemical reactive sites. It is generally accepted that the entire surface of MIECs may work as reactive sites for the ORR, because the ORR can occur at not only the triple phase boundary (TPB) but also the two phase boundary (2PB).6,7 Specifically, the TPB is a reaction site where the gas phase meets the electronic and ionic conducting phases at the electrode-electrolyte interface. In the case of MIECs, the ORR also occurred at the 2PB, which corresponds with the interface boundaries between MIECs and oxygen gas.Among various MIECs, cobalt containing oxides such as LaCoO 3 , PrCoO 3 , and...

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Highly efficient and robust cathode materials for low-temperature solid oxide fuel cells: PrBa0.5Sr0.5Co2−xFexO5+δ

Cited by 328 publications

References 35 publications

Enhanced oxygen reduction activity on surface-decorated perovskite La 0.6 Ni 0.4 FeO 3 cathode for solid oxide fuel cells

Enhanced oxygen reduction activity on surface-decorated perovskite La 0.6 Ni 0.4 FeO 3 cathode for solid oxide fuel cells

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

Scale-Down and Sr-Doping Effects on La₄Ni₃O_10-δ–YSZ Nanocomposite Cathodes for IT-SOFCs

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Highly efficient and robust cathode materials for low-temperature solid oxide fuel cells: PrBa0.5Sr0.5Co2−xFexO5+δ

Cited by 328 publications

References 35 publications

Enhanced oxygen reduction activity on surface-decorated perovskite La 0.6 Ni 0.4 FeO 3 cathode for solid oxide fuel cells

Enhanced oxygen reduction activity on surface-decorated perovskite La 0.6 Ni 0.4 FeO 3 cathode for solid oxide fuel cells

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

Scale-Down and Sr-Doping Effects on La4Ni3O10-δ–YSZ Nanocomposite Cathodes for IT-SOFCs

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Scale-Down and Sr-Doping Effects on La₄Ni₃O_10-δ–YSZ Nanocomposite Cathodes for IT-SOFCs