Journal
JOURNAL OF POWER SOURCES
Volume 423, Issue -, Pages 290-296Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2019.03.088
Keywords
Anode; Solid oxide fuel cell; ZnO; Surface diffusion; Methanol fuel
Funding
- NSF of China [51402210]
- Tianjin Municipal Science and Technology Commission [15JCQNJC06500]
- Program of Introducing Talents to the University Disciplines [B06006]
- Program for Changjiang Scholars and Innovative Research Teams in Universities [IRT 0641]
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Ni1-xZnxO-Ce0.8Sm0.2O1.9 is studied as an anode material for solid oxide fuel cells with hydrogen and methanol as fuels. After reduction, Zn is incorporated into the lattice of Ni when x is less than 0.5, while NiZn alloy accompanied with ZnO is formed when x reaches 0.8. The electrochemical oxidation process of H-2 on the anode is investigated with a symmetric cell under various H-2 partial pressures. The addition of Zn increases the electron cloud density of Ni and thus weakens the adsorbing strength of H on Ni, accelerating the surface diffusion of H species, which is the rate determining step when the content of Zn is lower than 0.5. ZnO in the reduced Ni0.2Zn0.8O-Ce0.8Sm0.2 anode facilitates H spillover, resulting in the variation of the rate determining step and the highest activity of the anode. The cell with Ni0.2Zn0.8O-Ce(0.8)Sm(0.2)O(1.9 )anode shows the highest performance with both H-2 and methanol fuels at 700 degrees C. ZnO also improves coking resistance of NiO-Ce0.8Sm0.2O1.9 anode.
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