Evaluation of SrSc0.175Nb0.025Co0.8O3-δ perovskite as a cathode for proton-conducting solid oxide fuel cells: The possibility of in situ creating protonic conductivity and electrochemical performance. (1st January 2018)

• Record Type: Journal Article
• Authors: Zhu, Ankang; Zhang, Guilin; Wan, Tingting; Shi, Tingting; Wang, Hong; Wu, Mingzai; Wang, Chunchang; Huang, Shouguo; Guo, Youmin; Yu, Hao; Shao, Zongping
• Is Part Of: Electrochimica acta. Volume 259(2018)
• Page Start: 559
• Page End: 565
• Publication Date: 2018-01-01
• Subjects: Cathode materials -- Proton conduction -- Hydroxyl species -- Oxygen reduction reaction -- Electrochemical performance; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2017.11.037
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: Proton-conducting solid oxide fuel cells (H + -SOFCs) have attracted considerable interest recently. However, the overall cell performance of H + -SOFCs is still low due to the lack of a promising cathode material. In this study, SrSc0.175 Nb0.025 Co0.8 O3-δ (SSNC) was synthesized for evaluation as a cathode material in H + -SOFCs based on a BaZr0.1 Ce0.7 Y0.2 O3-δ (BZCY) electrolyte. The chemical compatibility and stability of the SSNC cathode with the BZCY electrolyte in humidified air were studied. In addition, the electrochemical behavior of the SSNC cathode on the BZCY electrolyte was investigated using SSNC/BZCY/SSNC symmetrical cells at 600 °C in dry air and humidified air at various H2 O partial pressures. Promising electrocatalytic activity was observed for the SSNC cathode in humidified air. The area specific resistance obtained on symmetrical cells at 600 °C in a 10% H2 O-air atmosphere was 0.26 Ω cm 2 . A promising peak power density of 498 mW cm −2 was obtained using an anode-supported cell with a 46 μm-thick BZCY electrolyte layer at 700 °C. Graphical abstract: Highlights: The SrSc0.175 Nb0.025 Co0.8 O3-δ perovskite was evaluated for proton conducting SOFC. Polarization resistance of SSNC decreased obviously via introducing H2 O in gas phase. The symmetrical cell showed the lowest Rp of 0.26 Ω cm −2 at 600 °C in 3% H2 O-air. This study suggests that in situ creation of H + is possible at the SSNC cathode.