Enhanced Sulfur-resistance for Solid Oxide Fuel Cells Anode via Doping Modification of NaYTiO4

doi:10.15541/jim20240459

Abstract

Abstract:

Solid oxide fuel cells (SOFCs) are highly efficient energy conversion devices. However, the sulfur poison, which deteriorates traditional Ni-based anodes, restricts commercialization of the technology. Here, layered perovskite oxide NaYTiO₄ was prepared using solid-state method and modified by partial substitution with different valence ions. Properties of NaYTiO₄ before and after doping were systematically studied. Ni was doped into the perovskite layer and contributed to forming NaYTi_0.95Ni_0.05O₄, which regulated growth characteristics of the crystal and in-situ exsoluted in reduction conditions. Two-dimensional distribution of alkali metals and polar structures in the material provides advantages, including excellent chemical water absorption capacity and good sulfur-resistance. With an increased chemisorbed oxygen species of 64.5%, Ni-doped material becomes more outstanding. SOFC with NaYTi_0.95Ni_0.05O₄ as composite anode showed superior electrocatalytic activity. The peak power density reached 183.8 mW·cm^-2 at 800 ℃ with H₂ as fuel. Furthermore, the power density increased by 25.2% with an addition of 0.1% H₂S in H₂. The modified cell could work stably even at 700 ℃, a more toxic condition, for 40 h without significant poisoning effect. These results indicate that the modified layered perovskite oxides are excellent sulfur-resistance anodes.

Key words: layered perovskite oxide, doping, solid oxide fuel cell, anode, sulfur-resistance

CLC Number:

TB331
TM911

QU Jifa, WANG Xu, ZHANG Weixuan, ZHANG Kangzhe, XIONG Yongheng, TAN Wenyi. Enhanced Sulfur-resistance for Solid Oxide Fuel Cells Anode via Doping Modification of NaYTiO₄[J]. Journal of Inorganic Materials, 2025, 40(5): 489-496.

Figures/Tables 13

Fig. 1 XRD patterns of NYTO, NYTNO and NYTCO (a) before and (b) after reduction in H2 at 800 ℃ for 30 min

Fig. 2 SEM images of (a, b) NYTO, (c, d) NYTNO and (e, f) NYTCO (a, c, e) before and (b, d, f) after reduction

Fig. 3 (a) H2-TPR and (b) H2O-TPD curves of NYTO, NYTNO and NYTCO

Fig. 4 FT-IR spectra of NYTO and NYTNO after reduction and H2S treatment

Fig. 5 XPS spectra of NYTNO before and after reduction (a) O1s; (b) Ni2p

Fig. 6 EDS elemental mappings of NYTNO after reduction

Fig. 7 (a) XRD pattern of NYTNO and SDC mixture sintered at 1000 ℃ for 2 h; (b) Cross-sectional SEM images of fuel cell

Fig. 8 (a-c) I-V-P curves of the cells; (d) EIS spectra of the cells with H2 and 0.1% H2S-H2 as fuel at 800 ℃ (a) NYTO anode and H2 fuel; (b) NYTNO anode and H2 fuel; (c) NYTNO anode and 0.1% H2S-H2 fuel

Fig. 9 (a) Durability test of SOFCs with NYTO and NYTNO as anodes in 0.1% H2S-H2; (b) EIS spectra of NYTNO before and after stability test

Fig. 11 S1 XRD patterns of NYTO and NYTNO after calcination at 800 ℃ with static air for 40 h and 10% CO2 for 30 min

Fig. 12 S1 Thermal-expansion curves of NYTO and NYTNO

Fig. 13 S3 Conductivities of NYTO and NYTNO in H2, 3% H2O-H2 and 0.1% H2S-H2

Fig. 14 S4 SEM image of NYTNO/SDC anode after stability test

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Enhanced Sulfur-resistance for Solid Oxide Fuel Cells Anode via Doping Modification of NaYTiO₄

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