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Open AccessArticle

A Zn-Doped Ba0.5Sr0.5Co0.8Fe0.2O3-δ Perovskite Cathode with Enhanced ORR Catalytic Activity for SOFCs

1
School of Materials Science and Engineering & Key Laboratory of Inorganic Membranes, Jingdezhen Ceramic Institute, Jingdezhen 333403, China
2
Jiangxi Provincial Key Laboratory of Fuel Cell Materials and Devices, Jingdezhen 333001, China
3
School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, China
*
Author to whom correspondence should be addressed.
Catalysts 2020, 10(2), 235; https://doi.org/10.3390/catal10020235
Received: 26 January 2020 / Revised: 11 February 2020 / Accepted: 13 February 2020 / Published: 15 February 2020
(This article belongs to the Special Issue Electro-Catalysts for Energy Conversion and Storage Devices)
The insufficient oxygen reduction reaction activity of cathode materials is one of the main obstacles to decreasing the operating temperature of solid oxide fuel cells (SOFCs). Here, we report a Zn-doped perovskite oxide Ba0.5Sr0.5(Co0.8Fe0.2)0.96Zn0.04O3-δ (BSCFZ) as the SOFC cathode, which exhibits much higher electrocatalytical activity than Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) for the oxygen reduction reaction (ORR). The BSCFZ cathode exhibited a polarization resistance of only 0.23 and 0.03 Ω·cm2 on a symmetrical cell at 600 and 750°C, respectively. The corresponding maximum power density of 0.58 W·cm-2 was obtained in the yittria-stabilized zirconia (YSZ)-based anode-supported single cell at 750°C, an increase by 35% in comparison to the BSCF cathode. The enhanced performance can be attributed to a better balance of oxygen vacancies, surface electron transfer and ionic mobility as promoted by the low valence Zn2+ doping. This work proves that Zn-doping is a highly effective strategy to further enhance the ORR electrocatalytic activity of state-of-the-art Ba0.5Sr0.5Co0.8Fe0.2O3-δ cathode material for intermediate temperature SOFCs.
Keywords: solid oxide fuel cells; oxygen vacancy; oxygen reduction reaction; cathode; polarization resistance solid oxide fuel cells; oxygen vacancy; oxygen reduction reaction; cathode; polarization resistance
MDPI and ACS Style

Zeng, Q.; Zhang, X.; Wang, W.; Zhang, D.; Jiang, Y.; Zhou, X.; Lin, B. A Zn-Doped Ba0.5Sr0.5Co0.8Fe0.2O3-δ Perovskite Cathode with Enhanced ORR Catalytic Activity for SOFCs. Catalysts 2020, 10, 235.

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