Wettability analysis of Ni/YSZ interface under operating conditions of solid oxide cells

Abstract

In this study, model hydrogen electrodes for solid oxide cells (SOCs) were fabricated by depositing Ni onto YSZ electrolytes, and open-circuit holding or potentiostatic operation was conducted under various humidification and operating modes. The changes in wettability at the Ni/YSZ interface were investigated using contact angle analysis. After open-circuit holding, the contact angle of Ni particles remained almost unchanged under multiple conditions. However, under particular polarized conditions, there was a substantial alternation in the contact angle, resulting in either a considerable increase or decrease. By investigating the correlation between the hydrogen electrode gas atmosphere and substantial changes in contact angle, it was found that alterations in local oxygen partial pressure under polarized states, concomitant changes in surface and interfacial tension, potentially play a significant role.