Dopant-induced surface activation of ceria nanorods for electro-oxidation of hydrogen and propane in solid oxide fuel cells. (17th May 2021)

• Record Type: Journal Article
• Authors: Wang, Yue; Cui, Changsong; Tong, Yongcheng; Wang, Shiwei; Peng, Ranran; Chen, Chusheng; Zhan, Zhongliang
• Is Part Of: International journal of hydrogen energy. Volume 46:Number 34(2021)
• Page Start: 17922
• Page End: 17931
• Publication Date: 2021-05-17
• Subjects: Doped ceria -- Nanorods -- Oxygen vacancies -- Hydrogen oxidation -- Solid oxide fuel cells; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2021.02.193
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Ceria is an excellent oxide catalyst to break H2 in the absence of noble metals and has shown great promise for potential applications in diverse technological fields. The catalytic activity of ceria is critically linked to surface composition and structure. Herein, selective doping with moderate lanthanide ions is reported to regulate surface oxygen vacancies and bonded adsorbates of ceria nanorods so as to finely tune their activities toward electro-oxidation of H2 and C3 H8 in reduced-temperature solid oxide fuel cells. Lanthanide doped ceria nanorods are hydrothermally synthesized, and electrochemically evaluated as the anode catalysts for reduced-temperature SOFCs. Measurements of anode polarization resistances and fuel cell power densities show a catalytic activity in the order of Ce0.8 Pr0.2 O2-δ < Ce0.8 Gd0.2 O2-δ < Ce0.8 Sm0.2 O2-δ . Probing the surface structure with hydrogen temperature-programmed reduction, UV-Raman and XPS reveals that such catalytic activities are essentially determined by surface reducibility, availability of surface oxygen vacancies and strongly bonded hydroxyls. Highlights: CeO2 nanorods doped with lanthanide ions are synthesized as anodes for SOFCs. Activities of Ce0.8 Ln0.2 O2-δ are related to oxygen vacancies and bonded hydroxyls. P max of Sm-CeO2-δ are 0.63 and 0.23 Wcm −2 in H2 and C3 H8 at 600 °C, respectively.