Fe-Doped Ba_0.9K_0.1Fe_xCo_1–xO_3−δ Perovskite Cathode Material for Low-Temperature Solid Oxide Fuel Cells

Abstract

This study systematically investigated the effects of a single B-site dopant (Fe, x = 0–1.0) on the structure and oxygen reduction reaction of the Ba0.9K0.1CoO3−δ (BKC) material used as a cathode for low-temperature solid oxide fuel cells (LT-SOFCs). The structural, electronic, and electrocatalytic properties of the cathode materials prepared by a sol–gel method were comparatively characterized. The results indicated that cubic perovskite structure BKF x C (Fe, x = 0.5, 0.6) materials had been formed by calcination at 900 °C for 5 h. Moreover, in order to examine the electrochemical properties of BKF x C, the BKF x C cathode was constructed on the Sm0.075Nd0.075Ce0.85O2−δ (SNDC) electrolyte (BKFC/SNDC/BKFC: denoted as symmetric cells); the lowest polarization resistance (R P) was obtained for the BKF0.5C symmetric cell (1.6 Ω·cm2 at 550 °C), which demonstrated much higher electrocatalytic activity than that of a similar cell with the BKF0.6C cathode (2.87 Ω·cm2 at 550 °C). A single cell with the BKF0.5C cathode achieved a top power density of 752 mW·cm–2 at 550 °C, which is 0.35 times higher than that of the single cell with the BKF0.6C cathode (power density: 556 mW·cm–2). The corresponding total interface R P of the fuel cell was 0.303 Ω·cm2, lower than that of the doping amount of 0.6 (550 °C, 0.402 Ω·cm2). Meanwhile, O2 temperature-programmed desorption (O2-TPD) and thermogravimetric (TG) analysis were used to characterize the valence of Fe and Co changing from +4 to +3 as well as the stable structure of the material from room temperature to 600/1000 °C. As a result, a highly efficient method for the innovative BKFC cathode was developed in this work.

Realizing Coinstantaneous Multiple Benefits Generation from Sm0.075Nd0.075Ce0.85O2−δ/Al2O3 Heterostructure Electrolyte by Interfacial Engineering

“…CPE is the constant phase element demonstrating a nonideal capacitor. The polarization resistance ( R P ) of the cells can be divided into R 1 and R 2 parts which generally represent the charge transport, surface exchange impedance, and oxygen diffusion process at lower and higher frequency regions. , The data for R o , R 1 , and R 2 of NCAL|90SNDC-10Al 2 O 3 |NCAL, NCAL|94SNDC-6Al 2 O 3 |NCAL and NCAL|92SNDC-8Al 2 O 3 |NCAL are presented in Tables S1 and S2. In Table , decreasing the test temperature (550, 520, 490, 460, and 430 °C), the R o increases from 0.05 to 0.19 Ω·cm 2 .…”