Further optimization of the properties of Pr0.6Sr0.4Fe0.9W0.1O3-δ by Cu-doping as symmetric electrodes for solid oxide fuel cells

Copper-doped Pr0.6Sr0.4Fe0.8Cu0.1W0.1O3-delta (PSFCuW) as a symmetric electrode material is investigated for La0.8Sr0.2Ga0.8Mg0.2O3-delta (LSGM)-based symmetric solid oxide fuel cells (SSOFCs). The effect of Cu-doping on stability and mechanism of hydrogen oxidation reaction (HOR) and oxygen reduction reaction (ORR) is investigated and analyzed. Fe partially replaced by Cu on the B-site could also keep the phase structure stable after treatment under reducing conditions and improve the electrical conductivity, which reaches 30.3 and 0.78-1 under oxidizing and reducing conditions at 800 oC, respectively. The distribution of relaxation times (DRT) indicates that the rate-limiting step processes under oxidation conditions are oxygen adsorption and diffusion, while hydrogen adsorption and charge transfer have important influences on the rate-limiting step under reduced atmospheres, respectively. Finally, the LSGM-supported SSOFC (PSFCuW|LSGM|PSFCuW) shows excellent stability and reversibility. These results imply that PSFCuW is an up-to-coming symmetric electrode material for application in SSOFCs. (c) 2022 Elsevier B.V. All rights reserved.

Automated summary

This study investigates the application of copper-doped Pr0.6Sr0.4Fe0.8Cu0.1W0.1O3-delta (PSFCuW) as a symmetric electrode material in La0.8Sr0.2Ga0.8Mg0.2O3-delta (LSGM)-based symmetric solid oxide fuel cells (SSOFCs). The research analyzes the effect of Cu-doping on the stability and mechanism of the hydrogen oxidation reaction (HOR) and oxygen reduction reaction (ORR). The results show that partial substitution of Fe with Cu can maintain the phase structure stability and improve the electrical conductivity. The rate-limiting steps under oxidation conditions are oxygen adsorption and diffusion, while under reducing atmospheres, hydrogen adsorption and charge transfer have significant influences on the rate-limiting step. The LSGM-supported SSOFC (PSFCuW|LSGM|PSFCuW) demonstrates excellent stability and reversibility.