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Tuning the defects of the triple conducting oxide BaCoFeZrYO perovskite toward enhanced cathode activity of protonic ceramic fuel cells
Ist Teil von
Journal of materials chemistry. A, Materials for energy and sustainability, 2019-08, Vol.7 (31), p.18365-18372
Erscheinungsjahr
2019
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Protonic ceramic fuel cells (PCFCs) have interesting potential to efficiently produce electrical power from fuels in a low-temperature range (<650 °C). However, the sluggish activity of the oxygen reduction reaction is one of the greatest obstacles to the development of PCFCs. Single-phase triple-conducting (e
−
/O
2−
/H
+
) oxides are considered to be the most promising candidates for highly active PCFC cathodes because they can extend the electrochemically active sites to the entire cathode surface. Here, A-site deficiency of perovskite is introduced to tune the triple-conducting properties, which can stimulate the generation of oxygen vacancies and increase the oxygen-ion bulk diffusion and proton hydration kinetics. The so-obtained A-site-deficient perovskite oxides, Ba
x
Co
0.4
Fe
0.4
Zr
0.1
Y
0.1
O
3−
δ
(
x
= 1, 0.95, 0.9), exhibit area specific resistance values of 1.61, 0.94, and 0.52 Ω cm
2
for BaCo
0.4
Fe
0.4
Zr
0.1
Y
0.1
O
3−
δ
, Ba
0.95
Co
0.4
Fe
0.4
Zr
0.1
Y
0.1
O
3−
δ
, and Ba
0.9
Co
0.4
Fe
0.4
Zr
0.1
Y
0.1
O
3−
δ
, respectively, at 500 °C in wet air (
p
H
2
O
= 0.1 atm). Peak power densities of 797.47, 668.64, 548.07, and 376.27 mW cm
−2
are obtained from the PCFC with the Ba
0.9
Co
0.4
Fe
0.4
Zr
0.1
Y
0.1
O
3−
δ
cathode at 650, 600, 550 and 500 °C, respectively. Such remarkable performance demonstrates that introducing A-site deficiency is an effective strategy to enhance the triple-conducting properties of perovskite oxides for the high-activity cathode of PCFCs.
Ba deficiency is used to tune the electronic, oxygen-ion and proton conduction in BaCo
0.4
Fe
0.4
Zr
0.1
Y
0.1
O
3−
δ
perovskite for a high-activity cathode of PCFCs.
Sprache
–
Identifikatoren
ISSN: 2050-7488
eISSN: 2050-7496
DOI: 10.1039/c9ta04335g
Titel-ID: cdi_rsc_primary_c9ta04335g
Format
–
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