Enhanced sinterability of BaZr0.1Ce0.7Y0.1Yb0.1O3−δ by addition of nickel oxide

The effect of nickel oxide addition on the sintering behavior and electrical properties of BaZr0.1Ce0.7Y0.1Yb0.1O3−δ (BZCYYb) as an electrolyte for solid oxide fuel cells was systematically studied. Results suggest that the addition of a small amount (∼1 wt%) of NiO to BZCYYb greatly promoted densification, achieving ∼96% of the theoretical density after sintering at 1350 °C in air for 3 h (reducing the sintering temperature by ∼200 °C). Further, a sample sintered at 1450 °C for 3 h showed high open circuit voltages (OCVs) when used as the electrolyte membrane to separate the two electrodes under typical SOFC operating conditions, indicating that the electrical conductivity of the electrical conductivity of the BZCYYb was not adversely affected by the addition of ∼1 wt% NiO.

► We study the effect of NiO on sintering behavior and electrical properties of BZCYYb. ► 1 wt% of NiO to BZCYYb helped densification, reducing sintering temperature by 200 °C. ► Electrical conductivity of BZCYYb was not adversely affected by the addition of NiO. ► Sample sintered at 1450 °C for 3 h showed high open circuit voltages used as membrane.