Cited 0 time in webofscience Cited 0 time in scopus

Highly promoted electrocatalytic activity of spinel CoFe2O4 by combining with Er0.4Bi1.6O3 as a bifunctional oxygen electrode for reversible solid oxide cells

Title
Highly promoted electrocatalytic activity of spinel CoFe2O4 by combining with Er0.4Bi1.6O3 as a bifunctional oxygen electrode for reversible solid oxide cells
Authors
Kim, DoyeubThaheem, ImdadullahYu, HyeongminPark, Jeong HwaLee, Kang Taek
DGIST Authors
Kim, Doyeub; Thaheem, Imdadullah; Yu, Hyeongmin; Park, Jeong Hwa; Lee, Kang Taek
Issue Date
2022-01
Citation
Journal of Materials Chemistry A, 10(4), 2045-2054
Type
Article
Keywords
HIGH-PERFORMANCECOMPOSITE CATHODESFUEL-CELLSTEMPERATURESTABILITYDEGRADATIONREDUCTIONEFFICIENTCATALYST
ISSN
2050-7488
Abstract
Solid oxide cells (SOCs) allow the eco-friendly and direct conversion between chemical energy (e.g., hydrogen) and electric power, effectively mitigating the environmental issues associated with excessive fossil fuel consumption. Herein, we report the development of a highly active bifunctional oxygen electrode by combining the spinel-type CoFe2O4 and the cubic fluorite structured Er0.4Bi1.6O3-δ (CFO-ESB) for applications in reversible SOCs at reduced temperatures. X-ray diffraction analysis showed that CFO had a good chemical compatibility with the ESB phase. X-ray photoelectron spectroscopy and O2-temperature-programmed desorption results revealed that the incorporation of ESB into CFO increased the number of chemisorbed oxygen species, thereby promoting their catalytic activity in the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER). These results were consistently confirmed by electrochemical impedance spectroscopy, wherein the low polarization resistance of the CFO-ESB electrode in the YSZ electrolyte was observed (e.g., ∼0.29 Ω cm2 at 700 °C). Consequently, the reversible SOC prepared using the CFO-ESB oxygen electrodes showed excellent performances in both the fuel cell (∼1.0 W cm-2 peak power density) and electrolysis cell (∼1.5 A cm-2 at 1.3 V) modes at 700 °C. These results are one of the best values among the spinel-based oxygen electrode adopted cells reported to date, demonstrating highly efficient ORR and OER bifunctionality of the CFO-ESB. Thus, our findings suggest that CFO-ESB has high potential for use in oxygen electrodes for reversible SOC applications. This journal is © The Royal Society of Chemistry.
URI
http://hdl.handle.net/20.500.11750/16213
DOI
10.1039/d1ta07494f
Publisher
Royal Society of Chemistry
Files:
There are no files associated with this item.
Collection:


qrcode mendeley

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE