Theoretical and Experimental Investigations on K‐doped SrCo0.9Nb0.1O3‐δ as a Promising Cathode for Proton‐Conducting Solid Oxide Fuel Cells. Issue 18 (1st August 2021)

• Record Type: Journal Article
• Authors: Zhu, Kang; Yang, Yi; Huan, Daoming; Hu, Xueyu; Shi, Nai; Xie, Yun; Li, Xinyu; Xia, Changrong; Peng, Ranran; Lu, Yalin
• Is Part Of: ChemSusChem. Volume 14:Issue 18(2021)
• Page Start: 3876
• Page End: 3886
• Publication Date: 2021-08-01
• Subjects: cathodes -- density functional theory calculations -- hydration -- proton migration -- solid oxide fuel cell; Green chemistry -- Periodicals; Sustainable engineering -- Periodicals; Chemistry -- Periodicals; Chemical engineering -- Periodicals; 660
• DOI: 10.1002/cssc.202101100
• Languages: English
• ISSNs: 1864-5631

Abstract

Abstract: Improving proton conduction in cathodes is regarded as one of the most effective methods to accelerate the sluggish proton‐involved oxygen reduction reaction (P‐ORR) for proton‐conducting solid oxide fuel cells (P‐SOFCs). In this work, K + dopant was used to improve the proton uptake and migration ability of SrCo0.9 Nb0.1 O3‐ δ (SCN). K + ‐doped SCN (KSCN) demonstrated great potential to be a promising cathode for P‐SOFCs. Density functional theory calculations suggested that doping with K + led to more oxygen vacancies and more negative values of hydration enthalpy, which was helpful for the improvement of proton concentration. Importantly, the proton migration barriers could be depressed, benefiting proton conduction. Electrochemical investigations signified that the cell using KSCN cathode had a peak power density of 967 mW cm −2 at 700 °C, about 54.1 % higher than that using a SCN cathode. This research highlights the K + ‐doping strategy to improve electrochemical performance of cathodes for P‐SOFCs. Abstract : Powerful potassium : K + ‐doping increases proton uptake ability and significantly decreases the migration barrier. Cells with KSCN cathode show a promising electrochemical performance, 967 mW cm −2, which is about 54.1 % that of using a SCN cathode.