Electrolytic CO2 Performance of La0.3Sr0.6Ti1-xNixO3-δ-based Fiber Fuel Electrode for Solid Oxide Electrolysis Cell

doi:10.15541/jim20250056

Abstract

Abstract:

Interface engineering is an effective strategy to develop fuel electrode materials with excellent catalytic activity of CO₂ for solid oxide electrolysis cell. In this study, La_0.3Sr_0.6Ti_1-_xNi_xO_3-_δ/Ce_0.9Gd_0.1O_2-_δ (LSTN_x/GDC) composite fibers were directly prepared by electrospinning technology, by which novel fiber-based fuel electrodes were constructed with LSTN_x as electronic channel skeleton, GDC as embedded ion channel and in-situ Ni as exsolution nanoparticles. Effect of B-site Ni-doping on the morphology, structure and CO₂catalytic activity of the fiber-based fuel electrode was studied. The results of SEM observation reveal that the LSTN_x/GDC composite fibers with uniform diameter (100-150 nm) and without obvious particle agglomeration or fracture gap are successfully prepared when the Ni-doping coefficient (x) is 0.15 or 0.20. More in-situ B-site nickel nanoparticles (sizes between 20 and 30 nm) could be exsolved from the prepared fuel electrode under reducing atmosphere. The relaxation time distribution analysis confirms that in-situ exsolution of B-site nickel metal nanoparticles can not only provide more active sites, but also form rich heterointerfaces with composite fiber, accelerating the interfacial charge transfer, significantly increasing the adsorption and enhancing the catalytic ability of CO₂. Electrolytic current density of the single cell (with the doping coefficient of 0.20 at 850 ℃, CO₂ : H₂ at 5 : 5 (in volume) under 1.5 V) increases to 0.799 A·cm^-2 while polarization impedance decreases to 0.171 Ω·cm², presenting excellent stability without significant current fluctuation up to 70 h.

Key words: solid oxide electrolysis cell, fuel electrode, composite fiber, in-situ Ni exsolution, distribution of relaxation time

CLC Number:

TQ911

WANG Hongbin, WANG Leying, LUO Linghong, CHENG Liang, XU Xu. Electrolytic CO₂ Performance of La_0.3Sr_0.6Ti_1-_xNi_xO_3-_δ-based Fiber Fuel Electrode for Solid Oxide Electrolysis Cell[J]. Journal of Inorganic Materials, 2025, 40(11): 1212-1220.

Figures/Tables 8

Fig. 1 SEM images of LSTNx/GDC composite fibers (a, f) x=0; (b, g) x=0.05; (c, h) x=0.10; (d, i) x=0.15; (e, j) x=0.20

Fig. 2 TEM images and EDS elemental mappings of LSTN0.20/GDC composite fiber after reduction at 800 ℃ (a) TEM image; (b, c) HRTEM images; (d) HAADF image; (e) EDS mappings

Fig. 3 XRD patterns of (a) LSTNx/GDC (x=0, 0.05, 0.10, 0.15, 0.20) composite fibers and (b) fuel electrodes before testing

Fig. 4 SEM images of CNO@LSTNx/GDC (x=0, 0.05, 0.10, 0.15, 0.20) fuel electrodes after testing (a, f, k) x=0; (b, g, l) x=0.05; (c, h, m) x=0.10; (d, i, n) x=0.15; (e, j, o) x=0.20

Fig. 5 (a) XRD patterns and (b) XPS spectra of CNO@LSTNx/GDC (x=0, 0.15, 0.20) based fuel electrode after testing Colorful figures are available on website

Fig. 6 Electrolytic performance of single cells at 850 ℃ under CO2 : H2 at 5 : 5 (in volume) (a) I-V curves; (b) EIS spectra, fitting lines and equivalent circuit under 1.5 V; (c) DRT fitting spectra; (d) Histograms of polarization resistance for each peak in (c). Colorful figures are available on website

Table 1 Rp/(Ω·cm2) associated with each DRT peak for single cells at 1.5 V, 850 ℃ and CO2 : H2=5 : 5 (in volume)

Sample	HF(P1+P2)	IF(P3+P4)	LF(P5+P6)	Total
x=0	0.035	0.139	0.609	0.783
x=0.05	0.025	0.107	0.208	0.340
x=0.10	0.021	0.080	0.151	0.252
x=0.15	0.023	0.066	0.138	0.227
x=0.20	0.013	0.089	0.077	0.179

Fig. 7 Long-term stability of CNO@LSTNx/GDC (x=0, 0.20) single cells at 1.3 V, 850 ℃ under CO2 : H2 at 5 : 5 (in volume) (a) Long-term stability testing; (b, c) Cross-sectional SEM images of fuel electrodes with x at (b) 0 and (c) 0.2 after long-term stability testing

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Electrolytic CO₂ Performance of La_0.3Sr_0.6Ti_1-_xNi_xO_3-_δ-based Fiber Fuel Electrode for Solid Oxide Electrolysis Cell

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