Abstract
Overpotential and interfacial conductivity of Ni/YSZ anode in SOFCs were investigated under the conditions of various fuel compositions, based on a new reaction model around Triple Phase Boundary (TPB), in which hydrogen and oxygen atoms was assumed to be adsorbed on surfaces of Ni and YSZ, respectively, which was a “species territory adsorption model”. Through the model, the anode overpotential was explicitly expressed as a function of current density continuously from low to high sides and the interfacial conductivity of anode at equilibrium potential could be obtained analytically. The analytical results of anode overpotential were independent of hydrogen partial pressure at low current density region, while increased with decreasing hydrogen partial pressure at high current density region. Moreover, the interfacial conductivity as a function of water vapor pressure had a maximum value in the range of P H2O=0.15-0.25 atm. The analytical results agreed well with experimental ones.
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