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Lanthanum strontium cobalt ferrite (LSCF) is an appreciable cathode material for solid oxide fuel cells (SOFCs), and it has been widely investigated, owing to its excellent thermal and chemical stability. However, its poor oxygen reduction reaction (ORR) activity, particularly at a temperature of ≤ 800 ℃, causes setbacks in achieving a peak power density of > 1.0 W·cm-2, limiting its application in the commercialization of SOFCs. To improve the ORR of LSCF, doping strategies have been found useful. Herein, the porous tantalum-doped LSCF materials (La0.6Sr0.4Co0.4Fe0.57Ta0.03O3 (LSCFT-0), La0.6Sr0.4Co0.4Fe0.54Ta0.06O3, and La0.6Sr0.4Co0.4Fe0.5Ta0.1O3) are prepared via camphor-assisted solid-state reaction (CSSR). The LSCFT-0 material exhibits promising ORR with area-specific resistance (ASR) of 1.260, 0.580, 0.260, 0.100, and 0.06 Ω·cm2 at 600, 650, 700, 750, and 800 ℃, respectively. The performance is about 2 times higher than that of undoped La0.6Sr0.4Co0.4Fe0.6O3 with the ASR of 2.515, 1.191, 0.596, 0.320, and 0.181 Ω·cm2 from the lowest to the highest temperature. Through material characterization, it was found that the incorporated Ta occupied the B-site of the material, leading to the enhancement of the ORR activity. With the use of LSCFT-0 as the cathode material for anode-supported single-cell, the power density of > 1.0 W·cm-2 was obtained at a temperature < 800 ℃. The results indicate that the CSSR-derived LSCFT is a promising cathode material for SOFCs.


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Enhanced cathodic activity by tantalum inclusion at B-site of La0.6Sr0.4Co0.4Fe0.6O3 based on structural property tailored via camphor-assisted solid-state reaction

Show Author's information Dingyu XIONGaSefiu Abolaji RASAKIa,c( )Yangpu LIdLiangdong FANdChangyong LIUa,bZhangwei CHENa,b( )
Additive Manufacturing Institute, Shenzhen University, Shenzhen 518060, China
Guangdong Key Laboratory of Electromagnetic Control and Intelligent Robotics, Shenzhen University, Shenzhen 518060, China
Department of Chemical and Petroleum Engineering, University of Calgary, Calgary T2N1N4, Canada
College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China

Abstract

Lanthanum strontium cobalt ferrite (LSCF) is an appreciable cathode material for solid oxide fuel cells (SOFCs), and it has been widely investigated, owing to its excellent thermal and chemical stability. However, its poor oxygen reduction reaction (ORR) activity, particularly at a temperature of ≤ 800 ℃, causes setbacks in achieving a peak power density of > 1.0 W·cm-2, limiting its application in the commercialization of SOFCs. To improve the ORR of LSCF, doping strategies have been found useful. Herein, the porous tantalum-doped LSCF materials (La0.6Sr0.4Co0.4Fe0.57Ta0.03O3 (LSCFT-0), La0.6Sr0.4Co0.4Fe0.54Ta0.06O3, and La0.6Sr0.4Co0.4Fe0.5Ta0.1O3) are prepared via camphor-assisted solid-state reaction (CSSR). The LSCFT-0 material exhibits promising ORR with area-specific resistance (ASR) of 1.260, 0.580, 0.260, 0.100, and 0.06 Ω·cm2 at 600, 650, 700, 750, and 800 ℃, respectively. The performance is about 2 times higher than that of undoped La0.6Sr0.4Co0.4Fe0.6O3 with the ASR of 2.515, 1.191, 0.596, 0.320, and 0.181 Ω·cm2 from the lowest to the highest temperature. Through material characterization, it was found that the incorporated Ta occupied the B-site of the material, leading to the enhancement of the ORR activity. With the use of LSCFT-0 as the cathode material for anode-supported single-cell, the power density of > 1.0 W·cm-2 was obtained at a temperature < 800 ℃. The results indicate that the CSSR-derived LSCFT is a promising cathode material for SOFCs.

Keywords: oxygen reduction reaction (ORR), solid oxide fuel cell (SOFC), tantalum-doped lanthanum strontium cobalt ferrite (LSCF), solid-state synthesis reaction, clean energy conversion

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Publication history

Received: 24 March 2022
Revised: 20 June 2022
Accepted: 22 June 2022
Published: 13 July 2022
Issue date: August 2022

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© The Author(s) 2022.

Acknowledgements

This work is supported by the National Natural Science Foundation of China (No. 51975384), Guangdong Basic and Applied Basic Research Foundation (No. 2020A1515011547), and Shenzhen Fundamental Research Project (Nos. JCYJ20190808144009478, 20200731211324001).

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