| 1 | Activating and stabilizing the surface of anode for high-performing direct-ammonia solid oxide fuel cells显示文摘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. | Kang Xu Feng Zhu Mingyang Hou Canan Li Hua Zhang Yu Chen | 2023 | Nano Research2023，16，2： | 0 |
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