Sunday, April 8, 2018

ALD on Porous Materials: Problems with Conventional Approaches to Catalyst and Fuel Cell Electrode Preparation

The last two years I have been conducting some ALD and CVD on powder and started to follow that literature segment. Here is a most recent paper (Open Access) with a lot of practical information for all of you hands-on ALD people to test in the lab (or the fab God forbid...).

Atomic Layer Deposition on Porous Materials: Problems with Conventional Approaches to Catalyst and Fuel Cell Electrode Preparation


Tzia Ming Onn 1, Rainer Küngas 2, Paolo Fornasiero 3, Kevin Huang 4 and Raymond J. Gorte
Inorganics 2018, 6(1), 34; doi:10.3390/inorganics6010034

Atomic layer deposition (ALD) offers exciting possibilities for controlling the structure and composition of surfaces on the atomic scale in heterogeneous catalysts and solid oxide fuel cell (SOFC) electrodes. However, while ALD procedures and equipment are well developed for applications involving flat surfaces, the conditions required for ALD in porous materials with a large surface area need to be very different. The materials (e.g., rare earths and other functional oxides) that are of interest for catalytic applications will also be different. For flat surfaces, rapid cycling, enabled by high carrier-gas flow rates, is necessary in order to rapidly grow thicker films. By contrast, ALD films in porous materials rarely need to be more than 1 nm thick. The elimination of diffusion gradients, efficient use of precursors, and ligand removal with less reactive precursors are the major factors that need to be controlled. In this review, criteria will be outlined for the successful use of ALD in porous materials. Examples of opportunities for using ALD to modify heterogeneous catalysts and SOFC electrodes will be given. View Full-Text