TY - JOUR
T1 - Effect of tungsten doping on strontium ferrite electrode for symmetrical solid oxide electrochemical cell
AU - Su, Taolong
AU - Li, Yihang
AU - Yang, Yi
AU - Xu, Zheqiang
AU - Shi, Nai
AU - Wan, Yanhong
AU - Xie, Yun
AU - Huan, Daoming
AU - Xue, Shuangshuang
AU - Xia, Changrong
N1 - Funding Information:
This work was financially supported by the National Nature Science Foundation of China ( 51972298 ), the Science and Technology Foundation of Zhongshan ( 2019B2028 ) and University Innovation Foundation of Guangdong Province ( 2018KTSCX297 ).
Funding Information:
This work was financially supported by the National Nature Science Foundation of China (51972298), the Science and Technology Foundation of Zhongshan (2019B2028) and University Innovation Foundation of Guangdong Province (2018KTSCX297).
Publisher Copyright:
© 2020 Hydrogen Energy Publications LLC
PY - 2020/9/3
Y1 - 2020/9/3
N2 - Tungsten-doped strontium ferrite (SrFe1-xWxO3-δ, SFW) is prepared and characterized as the electrode materials for symmetrical solid oxide electrochemical cell. X-ray diffraction refinement reveals the symmetrical structure transform from cubic (pm3¯m) for x = 0.1 to tetragonal (I4/m) when x = 0.2. According to the analysis including electrical conductivity, Hydrogen temperature-programmed reduction (H2-TPR), thermal expansion and X-ray photoelectron spectra (XPS), it suggests that the decrease in conductivity, content of Fe2+ and oxygen vacancy concentration with the increase of W content is attributed to the stronger lattice framework. The oxygen vacancy can be dramatically activated around 600 °C. Using SrFe0.8W0.2O3-δ as the electrodes, symmetrical single cells supported on doped ceria electrolytes can achieve acceptable power density (0.19 W cm−2 at 750 °C) and considerable stability. Meanwhile symmetrical cells with La0.9Sr0.1Ga0.8Mg0.2O3-δ (LSGM) electrolyte substrates can achieve 0.75 A cm−2 at 800 °C under the voltage of OCV (open circuit voltage) +0.5 V when it is operated in electrolysis mode. SrFe0.8W0.2O3-δ can gain a considerable stability and electrochemical activity under both oxide and reductive atmospheres. Oxygen vacancy formation energy (Evac) and electron density distribution are computed to verify the enhancement on crystal structure stability by doping W. The Evac critically depends on the distance from the W atom.
AB - Tungsten-doped strontium ferrite (SrFe1-xWxO3-δ, SFW) is prepared and characterized as the electrode materials for symmetrical solid oxide electrochemical cell. X-ray diffraction refinement reveals the symmetrical structure transform from cubic (pm3¯m) for x = 0.1 to tetragonal (I4/m) when x = 0.2. According to the analysis including electrical conductivity, Hydrogen temperature-programmed reduction (H2-TPR), thermal expansion and X-ray photoelectron spectra (XPS), it suggests that the decrease in conductivity, content of Fe2+ and oxygen vacancy concentration with the increase of W content is attributed to the stronger lattice framework. The oxygen vacancy can be dramatically activated around 600 °C. Using SrFe0.8W0.2O3-δ as the electrodes, symmetrical single cells supported on doped ceria electrolytes can achieve acceptable power density (0.19 W cm−2 at 750 °C) and considerable stability. Meanwhile symmetrical cells with La0.9Sr0.1Ga0.8Mg0.2O3-δ (LSGM) electrolyte substrates can achieve 0.75 A cm−2 at 800 °C under the voltage of OCV (open circuit voltage) +0.5 V when it is operated in electrolysis mode. SrFe0.8W0.2O3-δ can gain a considerable stability and electrochemical activity under both oxide and reductive atmospheres. Oxygen vacancy formation energy (Evac) and electron density distribution are computed to verify the enhancement on crystal structure stability by doping W. The Evac critically depends on the distance from the W atom.
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U2 - 10.1016/j.ijhydene.2020.06.111
DO - 10.1016/j.ijhydene.2020.06.111
M3 - Article
AN - SCOPUS:85089008444
SN - 0360-3199
VL - 45
SP - 23401
EP - 23410
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
IS - 43
ER -
