Liu Yuanyuan, Li Hongyun, Cai Changkun, Li Shuting, Cui Jinlong, An Shengli
School of Chemistry and Chemical Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China.
Inner Mongolia Key Laboratory of Advanced Ceramics and Device, Baotou 014010, China.
ACS Omega. 2023 Feb 16;8(8):8011-8018. doi: 10.1021/acsomega.2c07855. eCollection 2023 Feb 28.
To improve the performance of the CeGdO (GDC) electrolyte in a solid oxide fuel cell, it is necessary to block the electronic conduction due to Ce/Ce transitions occurring at elevated temperatures. In this work, a GDC/ScSZ double layer consisting of 50 nm GDC and 100 nm ZrScO (ScSZ) thin films were deposited on a dense GDC substrate by the pulsed laser deposition (PLD) technology. The effectiveness of the double barrier layer in blocking the electronic conduction of the GDC electrolyte was investigated. The results showed that the ionic conductivity of GDC/ScSZ-GDC was slightly lower than that of GDC in the temperature range of 550-750 °C, but the difference gradually decreased with the increase in temperature. At 750 °C, the conductivity of GDC/ScSZ-GDC was 1.54 × 10 S·cm, which was almost the same as that of GDC. The electronic conductivity of GDC/ScSZ-GDC was 1.28 × 10 S·cm, which was lower than that of GDC. The conductivity results showed that the ScSZ barrier layer can reduce electron transfer effectively. More obviously, the open-circuit voltage and the peak power density of the (NiO-GDC)|GDC/ScSZ-GDC|(LSCF-GDC) cell were higher than those of the (NiO-GDC)|GDC|(LSCF-GDC) cell in the temperature range of 550-750 °C. The superior performance of the GDC/ScSZ-GDC electrolyte is attributed to the ScSZ thin layer, which is effective in blocking the electronic conduction of the GDC electrolyte.
为提高氧化铈钆（GDC）电解质在固体氧化物燃料电池中的性能，有必要阻止高温下因Ce/Ce转变而产生的电子传导。在本工作中，采用脉冲激光沉积（PLD）技术在致密的GDC衬底上沉积了由50 nm GDC和100 nm锆钪氧化物（ScSZ）薄膜组成的GDC/ScSZ双层结构。研究了该双阻挡层对GDC电解质电子传导的阻挡效果。结果表明，在550 - 750 °C温度范围内，GDC/ScSZ - GDC的离子电导率略低于GDC，但随着温度升高，差异逐渐减小。在750 °C时，GDC/ScSZ - GDC的电导率为1.54×10 S·cm，与GDC几乎相同。GDC/ScSZ - GDC的电子电导率为1.28×10 S·cm，低于GDC。电导率结果表明，ScSZ阻挡层能有效减少电子转移。更明显的是，在550 - 750 °C温度范围内，(NiO - GDC)|GDC/ScSZ - GDC|(LSCF - GDC)电池的开路电压和峰值功率密度高于(NiO - GDC)|GDC|(LSCF - GDC)电池。GDC/ScSZ - GDC电解质的优异性能归因于ScSZ薄层，它能有效阻挡GDC电解质的电子传导。
