Enhanced Compatibility and Activity of High-entropy Double Perovskite Cathode Material for IT-SOFC

doi:10.15541/jim20220551

Abstract

Abstract:

Intermediate-temperature solid oxide fuel cell (IT-SOFC) is promising for carbon neutrality, but its cathode is limited by the contradiction between thermal compatibility and catalytic activity. Herein, we propose a high-entropy double perovskite cathode material, GdBa(Fe_0.2Mn_0.2Co_0.2Ni_0.2Cu_0.2)₂O₅₊_δ (HE-GBO) with improved compatibility and activity, in view of the high-entropy strategy by multi-elemental coupling, which possesses double perovskite structure and excellent chemical compatibility with state-of-the-art Gd_0.1Ce_0.9O_2-_δ(GDC). The polarization resistance (R_p) of the symmetrical cells with HE-GBO cathode is 1.68 Ω·cm² at 800 ℃, and the corresponding R_p of HE-GBO-GDC (mass ratio 7:3) composite cathode can be greatly reduced (0.23 Ω·cm² at 800 ℃) by introducing GDC. Dendritic microchannels anode-supported single cells with HE-GBO and HE-GBO-GDC cathodes realize maximum power densities of 972.12 and 1057.06 mW/cm² at 800 ℃, respectively, indicating that cell performance can be enhanced by high-entropy cathodes. The results demonstrate that high-entropy double perovskite cathode material HE-GBO has a high potantial to solve the conflict problem of thermal compatibility and catalytic activity in IT-SOFCs.

Key words: high-entropy cathode, solid oxide fuel cells, thermal compatibility, dendritic microchannels

CLC Number:

GUO Tianmin, DONG Jiangbo, CHEN Zhengpeng, RAO Mumin, LI Mingfei, LI Tian, LING Yihan. Enhanced Compatibility and Activity of High-entropy Double Perovskite Cathode Material for IT-SOFC[J]. Journal of Inorganic Materials, 2023, 38(6): 693-700.

Figures/Tables 10

Fig. 1 (a) XRD patterns and (b) corresponding magnified area of 2θ=45°-50° of GBCO and HE-GBO powders calcined at 1150 ℃ for 3 h, and (c) schematic diagram of the HE-GBO double perovskite structure

Fig. 2 XRD patterns of chemical compatibility between cathode (HE-GBO) and electrolytes materials (YSZ and GDC) calcined at 950 ℃ in air

Fig. 3 Temperature dependence of average CTE of GBCO and HE-GBO in air from 25 to 800 ℃ Colorful figure is available on website

Fig. 4 EIS plots of symmetrical single cells with (a) HE-GBO and (b) HE-GBO-GDC cathodes measured from 800 to 600 ℃ in air Colorful figures are available on website

Fig. 5 Cross-section morphologies of single cell with (a) HE-GBO and (b) HE-GBO-GDC after 100 h long-term test, and (c, d) their magnified morphologies, respectively

Fig. 6 EDS surface sweep results for high-entropy cathode material (HE-GBO, in Fig. 5(c)) after 100 h long-term test

Fig. 7 I-V and I-P curves of single cells with (a) HE-GBO and (b) HE-GBO-GDC cathodes measured from 800 ℃ to 600 ℃ in wet H2 (~3% H2O)

Fig. 8 EIS plots of single cells with (a) HE-GBO and (b) HE-GBO-GDC cathodes measured from 800 ℃ to 600 ℃ in wet H2 (~3% H2O), (c) simulated polarization resistance, and (d) Arrhenius plots of single cells with HE-GBO and HE-GBO-GDC cathodes Colorful figures are available on website

Fig. 9 DRT analysis of EIS data for the single cells with (a) HE-GBO and (b) HE-GBO-GDC cathodes from 800-600 ℃

Fig. 10 Long-term stability performance of single cell with HE-GBO cathode in H2 (~3% H2O) atmosphere

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