Abstract
Ni-Y2O3 stabilized ZrO2 (Ni-YSZ) cermet is a widely used hydrogen electrode for solid oxide fuel cells (SOECs), but detailed studies regarding the water splitting processes are scarce. Here we report the preliminary results on the electrocatalytic activity of Ni-YSZ hydrogen electrode in the SOEC mode as a function of operating temperature and water concentration. The electrode activity for the water splitting reaction is strongly influenced by the water concentration and dc bias. The electrochemical performance for the water splitting reaction increases with the increase of water concentration. On the other hand, the electrode polarization resistance increases gradually with the increase of dc bias regardless of the H2O content, which is particularly pronounced in the low frequency impedance process related to the H2O dissociative adsorption and diffusion processes. The reaction mechanism and kinetics of the H2O dissociation reaction on Ni-YSZ hydrogen electrodes are discussed.
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