期刊
ELECTROCHIMICA ACTA
卷 229, 期 -, 页码 48-54出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2017.01.141
关键词
Solid oxide electrolyser; Steam electrolysis; Redox reversibility; Cathode
资金
- Natural Science Foundation of China [91545123, 21628301]
- Natural Science Foundation of Fujian Province [2016J01275]
- EPSRC [EP/K021036/2, EP/K021036/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/K021036/1, EP/K021036/2] Funding Source: researchfish
In this work, perovskite Sr1-xPrxFeO3-delta (SPF) (x=0.02, 0.04, 0.06, 0.08 and 0.10) are investigated and employed as solid oxide steam electrolyser cathode at 800 degrees C. X-ray diffraction (XRD), scanning electron microscope (SEM), and transmission electron microscopy (TEM) analysis together indicate that the Sri,PrxFeO3-delta is redox reversible with a phase transition from cubic to orthorhombic structure in redox cycles. The doping of Pr in A site has remarkably enhanced the electronic conduction to 1.0-1.2 S cm(-1) at intermediate temperatures in reducing atmosphere. Electrochemical measurements demonstrate that the polarization resistance with Sr0.96Pr0.04FeO3-delta electrode shows the lowest values of 0.25 Omega, cm(2) in symmetric cells in reducing atmosphere at 800 degrees C. Direct steam electrolysis with Sr0.96Pr0.04FeO3-delta cathode shows a current density of 1.64 A cm(-2) at 2.0V when fed with 5%/H2O/Ar. The hydrogen production rate reaches 4.73, 6.68, 835 and 10.23 mL min(-1) cm(2) at 1.4,1.6, 1.8, 2.0V, respectively, while the highest Faraday efficiency is as high as 97.16% at 1.8 V. (C) 2017 Elsevier Ltd. All rights reserved.
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