Tailoring the protonic conductivity of porous yttria-stabilized zirconia thin films by surface modification

Abstract

Porous yttria-stabilized zirconia (YSZ) thin films were prepared by pulsed laser deposition to investigate the influence of specific surface area on the electrical and protonic transport properties.

Ordered mesoporous metal oxides for electrochemical applications: correlation between structure, electrical properties and device performance

“…29). An amorphous-to-crystalline phase transition with increasing layer thickness has also been reported by Celik et al 129 They coated porous YSZ thin films by ALD of TiO 2 . While the deposition of 6 nm TiO 2 resulted in the formation of amorphous material, a crystalline coating (anatase TiO 2 ) was found for a thickness of approx.…”

“…However, it is now widely accepted that the increased conductivity arises from protons moving in chemisorbed and physisorbed water layers along the pores and surface of nanostructured oxides. 100,104,[127][128][129][130] The strong dependence of the protonic conductivity on relative humidity and temperature is related to the structure of the adsorbed water molecules, as summarized by Stub et al 131 The structure of the water layer on TiO 2 is schematically shown in Fig. 11.…”

“…13). 129 The decrease in total conductivity in case of the mesoporous films was attributed to the annihilation of oxygen vacancies at the surface according to eqn (12), which are the majority charge carriers in YSZ. A decrease in total conductivity under wet atmospheric conditions has also been reported for microcrystalline CeO 2 by Chueh et al They attributed this result to changes in the space-charge potential of grain boundaries upon hydration.…”

Surface Effect of Nano-Roughened Yttria-Doped Zirconia on Salivary Protein Adhesion

“…However, adsorption of salivary enzymatic molecules on the polished surface also propose another underlying mechanism together with the nano surface roughness [ 17 ], as polishing involves breakage of surface bonds when the material is removed, as a result the surface nature is altered; transforming the surface, which we initially thought as dull and monotonous attraction towards uptake of salivary biomolecules. It is recognized that proteins tend to adhere more strongly to non- polar than to polar, to high surface tension than to low surface tension, and to charged than to uncharged substrates [ 18 , 19 ].…”

Thin Film NCM Cathodes as Model Systems to Assess the Influence of Coating Layers on the Electrochemical Performance of Lithium Ion Batteries

“…To investigate the influence of an ultrathin surface coating with varying thickness on the electrochemical performance, NCM samples were coated with a thin Al 2 O 3 film using atomic layer deposition (ALD), which enables a homogeneous coating even of porous samples. [66,67,88] The ALD deposition was carried out in a PicoSun R200 ALD reactor using trimethylaluminium (TMA, STREM chemicals inc., min. 98%) as precursor and deionized water as reactant for TMA to form the oxide layer.…”