Chinese Journal of Catalysis ›› 2018, Vol. 39 ›› Issue (9): 1484-1492.DOI: 10.1016/S1872-2067(18)63118-3

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Effect of Gd0.2Ce0.8O1.9 nanoparticles on the oxygen evolution reaction of La0.6Sr0.4Co0.2Fe0.8O3-δ anode in solid oxide electrolysis cell

Fang Guana,b,c, Xiaomin Zhanga,b, Yuefeng Songa,b,c, Yingjie Zhoua,b, Guoxiong Wanga,b, Xinhe Baoa,b   

  1. a State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
    b Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
    c University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2018-05-29 Revised:2018-06-06 Online:2018-09-18 Published:2018-07-19
  • Contact: 10.1016/S1872-2067(18)63118-3
  • Supported by:

    This work was supported by the National Key R&D Program of China (2017YFA0700102), the National Natural Science Foundation of China (21703237, 21573222, 91545202), Dalian Institute of Chemical Physics (DICP DMTO201702), the Strategic Priority Research Program of the Chinese Academy of Sciences (XDB17020200) and CAS Youth Innovation Promotion (2015145).

Abstract:

La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) anodes were infiltrated by Gd0.2Ce0.8O1.9 (GDC) nanoparticles to improve the oxygen evolution reaction (OER) performance of solid oxide electrolysis cells (SOECs) in CO2 electroreduction. The effect of GDC loading was investigated, and 10 wt% GDC nanoparticle infiltration of the LSCF (10GDC/LSCF) anode results in the highest OER performance. Electrochemical impedance spectra measurements indicate that the infiltration by GDC nanoparticles greatly decreases the polarization resistance of the SOECs with the 10GDC/LSCF anodes. The following distribution of relaxation time analysis suggests that four individual electrode processes are involved in the OER and that all of them are accelerated on the 10GDC/LSCF anode. Three phase boundaries, surface oxygen vacancies, and bulk oxygen mobility increased, based on scanning electron microscopy and temperature-programmed desorption of O2 characterizations, and contributed to the enhancement of the four electrode processes of the OER and electrochemical performance of SOECs.

Key words: Gd0.2Ce0.8O1.9nanoparticles, La0.6Sr0.4Co0.2Fe0.8O3-δ anode, Oxygen evolution reaction, Three phase boundaries, Solid oxide electrolysis cell