Journal
JOURNAL OF ENERGY CHEMISTRY
Volume 35, Issue -, Pages 71-78Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jechem.2018.11.002
Keywords
Electrochemical carbon dioxide reduction reaction; Solid oxide electrolysis cell; Double perovskite; Infiltration
Funding
- Ministry of Science and Technology of China [2017YFA0700102]
- National Natural Science Foundation of China [21573222, 91545202 and21703237]
- DICP [DMTO201702]
- Dalian Outstanding Young Scientist Foundation [2017RJ03]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB17020200]
- CAS Youth Innovation Promotion [2015145]
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Solid oxide electrolysis cell (SOEC) can electrochemically convert CO2 to CO at the gas-solid interface with a high current density and Faradaic efficiency, which has attracted increasing attentions in recent years. Exploring efficient catalyst for electrochemical CO2 reduction reaction (CO2RR) at the cathode is a grand challenge for the research and development of SOEC. Sr2Fe1.5Mo0.5O6-delta (SFM) is one kind of promising cathode materials for SOEC, but suffers from insufficient activity for CO2RR. Herein, Gd0.2Ce0.8O1.9 (GDC) nanoparticles were infiltrated onto the SFM surface to construct a composite GDC-SFM cathode and improve the CO2RR performance in SOEC. The current density over the GDC infiltrated SFM cathode with a GDC loading of 12.8 wt% reaches 0.446 A cm(-2) at 1.6V and 800 degrees C, which is much higher than that over the SFM cathode (0.283 A cm(-2)). Temperature-programmed desorption of CO2 measurements suggest that the infiltration of GDC nanoparticles significantly increases the density of surface active sites and three phase boundaries (TPBs), which are beneficial for CO2 adsorption and subsequent conversion. Electrochemical impedance spectroscopy results indicate that the polarization resistance of 12.8 wt% GDC-SFM cathode was obviously decreased from 0.46 to 0.30 Omega cm(2) after the infiltration of GDC nanoparticles. (C) 2018 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.
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