Activating and stabilizing the surface of anode for high-performing direct-ammonia solid oxide fuel cells
作者机构：School of Environment and EnergySouth China University of TechnologyGuangzhou 510006China
出 版 物：《Nano Research》 (纳米研究（英文版）)
年 卷 期：2023年第16卷第2期
页 面：2454-2462页
核心收录：
学科分类：0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学]
基 金：supported by the National Natural Science Foundation of China(Nos.22179039 and 22005105) the Natural Science Foundation of Guangdong Province(No.2021A1515010395) the Pearl River Talent Recruitment Program(Nos.2019QN01C693 and 2021ZT09L392).
主 题：solid oxide fuel cells anode catalyst infiltration ammonia
摘 要：Ammonia has been recognized as a promising fuel for solid oxide fuel cells(SOFCs)because of its relatively high hydrogen content and high energy density.However,the effective catalysis of ammonia on the surface of state-of-the-art anode greatly hinders the further development of direct ammonia SOFCs.In this study,we report our findings of surface activating and stabilizing of a Ni-based cermet anode for highly efficient and durable operation on ammonia fuel,achieved by a surface coating of CeO_(2)−δnanoparticles(NPs).When incorporated into a Ni-yttria-stabilized zirconia(Ni-YSZ)anode-supported single cell,the coatings demonstrate an improved electrochemical reaction activity and stability,achieving a high peak power density of 0.941 W·cm^(−2)at 700℃,and a promising stability of~60 h(degradation rate of 0.127%h^(−1)at 0.5 A·cm−2),much better than those of cells with a bare anode(~0.673 W·cm^(−2)and degradation rate of 0.294%h−1 at 0.5 A·cm^(-2)).The catalytic NPs significantly enhance the reaction activity toward the decomposition of ammonia and oxidation of hydrogen,especially at low temperatures(700℃),as confirmed by the detailed distribution of relaxation time(DRT)analyses of the impedance spectra of the cells on NH3 fuel.
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