TY  - JOUR
AU  - HU, Xingguo
AU  - LIU, Limin
AU  - QIAN, Xinyuan
AU  - HE, Feifan
AU  - WANG, Zhou
AU  - CHEN, Hanyu
AU  - SHENG, Yang
AU  - ZHOU, Xiaoliang
PY  - 2022
TI  - Electrochemical Properties of Fe/Mn Doped CeO2 Impregnation Modified Ni-YSZ Electrode for High Temperature Solid Oxide Cells
JO  - Journal of Ceramics
SN  - 2095-784X
SP  - 401
EP  - 411
VL  - 43
IS  - 3
AB  - Solid oxide cells (SOCs) with Ni-YSZ fuel electrodes were prepared by using cast-screen printing method. Highly catalytically active materials, including Ce0.9Fe0.1O2−δ (CFO), Ce0.9Mn0.1O2−δ (CMO) and Ce0.6Fe0.1Mn0.3O2−δ (CFM), were prepared by using Fe/Mn doped CeO2, which were then impregnated to modify the Ni-YSZ electrodes. Microstructure, properties and stability of the electrodes after impregnation modification were studied, with electrochemical tests combined with analytical characterization methods, such as scanning electron microscopy (SEM), X-ray diffractometer (XRD) and energy spectrometer. The highest power densities of the unimpregnated, CFO, CMO and CFM impregnation modified Ni-YSZ electrodes in H2 (3 vol.% H2O) at 850 ℃ were 526 mW·cm−2, 724 mW·cm−2, 706 mW·cm−2 and 829 mW·cm−2, respectively, while the electrolytic current densities in VCO2:VCO=50:50 at 850 ℃ at 1.8 V were 0.55 A·cm−2, 1.39 A·cm−2, 1.43 A·cm−2 and 1.63 A·cm−2, respectively. Obviously, the performance was significantly improved after the impregnation modification, with CFM to be the best modification agent. The CFM-impregnated Ni-YSZ electrode was characterized by using CO2 electrolytic stability test and EDS element content analysis. The decay rate was only 3.7% after testing for 100 h and the C content was almost unchanged before and after the testing, indicating that the CFM-impregnated Ni-YSZ electrode has high stability and can suppress the generation of carbon deposition. Therefore, CFO, CMO, and CFM are promising impregnation modifiers to extend the length of the three-phase boundary (TPB), optimize the microstructure and improve catalytic activity and stability of the Ni-YSZ electrode.
UR  - https://doi.org/10.13957/j.cnki.tcxb.2022.03.005
DO  - 10.13957/j.cnki.tcxb.2022.03.005