Electrochemical performance of La0.7Sr0.3Fe0.9Ni0.1O3-δ symmetric electrode for solid oxide fuel cell with CO as fuel

doi:10.19799/j.cnki.2095-4239.2021.0628

Abstract

Abstract:

Sr、Ni co-doped La_0.7Sr_0.3Fe_0.9Ni_0.1O_3-_δ (LSFNi) electrode was synthesized using a sol-gel method. The oxidation of CO electrochemically on LSFNi was studied. The results demonstrate that the LSFNi electrode has good chemical compatibility with LSGM and GDC electrolytes. Furthermore, the conductivity of the LSFNi bar increases with the increasing temperature in the 5% H₂-Ar, and the maximum conductivity of 0.85 S·cm^-1 was obtained at 850 ℃. The peak power density of LSFNi-GDC/LSGM/LSFNi-GDC symmetric cell reaches 470, 288, 196, and 130 mW·cm^-2 at 850 ℃, 800 ℃, 750 ℃, and 700 ℃, respectively. Furthermore, the polarization resistance (R_p ) of the symmetric full cell at the same condition is 0.64, 1.01, 1.83, and 3.82 ?·cm², respectively. The charge transfer mechanism and adsorption/desorption of CO are slower than those of H₂, resulting in a somewhat poorer electrochemical property. In the end, the symmetric cell exhibits a reasonable short stability with a degradation rate of 0.003 V·h^-1 at 850℃ under a constant current density of 600 mA·cm^-2.

Key words: solid oxide fuel cell, symmetric cell, carbon deposition, CO

CLC Number:

O 646

Changyang LIU, Liuzhen BIAN, Jianquan GAO, Jihua PENG, Jun PENG, Shengli AN. Electrochemical performance of La_0.7Sr_0.3Fe_0.9Ni_0.1O_3-_δ symmetric electrode for solid oxide fuel cell with CO as fuel[J]. Energy Storage Science and Technology, 2022, 11(7): 2059-2065.

Figures/Tables 8

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Table 1

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t/℃	Atmosphere	R_s/Ω·cm²	R₁/Ω·cm²	C₁(*10^-4)/F·cm²	f₁/Hz	R₂/Ω·cm²	C₂/F·cm²	f₂/Hz	R_p/Ω·cm²
850	H₂	0.24	0.32	11.4	444	0.15	1.87	0.56	0.47
850	CO	0.23	0.35	10.2	446	0.29	1.76	0.31	0.64
800	H₂	0.31	0.57	7.6	371	0.12	1.86	0.69	0.69
800	CO	0.31	0.77	9.2	222	0.24	2.08	0.32	1.01
750	H₂	0.43	0.95	7.0	241	0.23	0.42	1.63	1.18
750	CO	0.43	1.35	9.2	128	0.48	1.78	0.19	1.83
700	H₂	0.66	2.05	7.6	102	0.31	0.30	1.71	2.36
700	CO	0.46	2.69	11.3	52	1.13	1.57	0.15	3.82

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