Solís Cecilia, Toldra-Reig Fidel, Balaguer María, Somacescu Simona, Garcia-Fayos Julio, Palafox Elena, Serra José M
Instituto de Tecnología Química, Universitat Politècnica de València, Consejo Superior de Investigaciones Científicas, Avenida de los Naranjos s/n., 46022, Valencia, Spain.
"Ilie Murgulescu" Institute of Physical Chemistry, Romanian Academy, Spl. Independentei 202, 060021, Bucharest, Romania.
ChemSusChem. 2018 Aug 22;11(16):2818-2827. doi: 10.1002/cssc.201800420. Epub 2018 Aug 1.
NiFe O -Ce Gd O (NFO/CGO) nanocomposite thin films were prepared by simultaneously radio-frequency (RF) magnetron sputtering of both NFO and CGO targets. The aim is the growth of a CO -stable composite layer that combines the electronic and ionic conduction of the separate NFO and the CGO phases for oxygen separation. The effect of the deposition temperature on the microstructure of the film was studied to obtain high-quality composite thin films. The ratio of both phases was changed by applying different power to each ceramic target. The amount of each deposited phase as well as the different oxidation states of the nanocomposite constituents were analyzed by means of X-ray photoelectron spectroscopy (XPS). The transport properties were studied by conductivity measurements as a function of temperature and pO . These analyses enabled (1) selection of the best deposition temperature (400 °C), (2) correlation of the p-type electronic behavior of the NFO phase with the hole hopping between Ni -Ni , and (3) following the conductivity behavior of the grown composite layer (prevailing ionic or electronic character) attained by varying the amount of each phase. The sputtered layer exhibited high ambipolar conduction and surfaceexchange activity. A 150 nm-thick nanograined thin film was deposited on a 20 μm-thick Ba Sr Co Fe O asymmetric membrane, resulting in up to 3.8 mL min cm O permeation at 1000 °C under CO atmosphere.
通过同时对NiFeO和CeGdO靶材进行射频（RF）磁控溅射制备了NiFeO -CeGdO（NFO/CGO）纳米复合薄膜。目的是生长一种CO稳定的复合层，该复合层结合了单独的NFO和CGO相的电子传导和离子传导以进行氧分离。研究了沉积温度对薄膜微观结构的影响，以获得高质量的复合薄膜。通过对每个陶瓷靶材施加不同功率来改变两相的比例。借助X射线光电子能谱（XPS）分析了每个沉积相的量以及纳米复合成分的不同氧化态。通过电导率测量研究了传输性质与温度和pO的函数关系。这些分析使得能够（1）选择最佳沉积温度（400°C），（2）将NFO相的p型电子行为与Ni -Ni之间的空穴跳跃相关联，以及（3）跟踪通过改变每个相的量获得的生长复合层的电导率行为（主要是离子或电子特性）。溅射层表现出高的双极传导和表面交换活性。在20μm厚的BaSrCoFeO不对称膜上沉积了150nm厚的纳米颗粒薄膜，在1000°C的CO气氛下，氧渗透量高达3.8mL·min·cm。
