Investigation of Rh–titanate (ATiO₃) interactions on high-surface-area perovskite thin films prepared by atomic layer deposition

Abstract

Thin, ~1-nm films of CaTiO3, SrTiO3, and BaTiO3 were deposited onto MgAl2O4 by Atomic Layer Deposition (ALD) and studied as catalyst supports for Rh. Scanning Transmission Electron Microcopy (STEM) and...

Two-Dimensional Perovskite Crystals Formed by Atomic Layer Deposition of CaTiO3 on γ-Al2O3

“…It is interesting to ask why the results on SiO 2 are so different from those on Al 2 O 3 and MgAl 2 O 4 [ 21 , 25 ]. Clearly, the perovskite films are not epitaxially matched to the crystal structures of Al 2 O 3 (cubic, a = 0.7912 nm) or MgAl 2 O 4 (cubic, a = 0.8081 nm) [ 12 ].…”

“…In the present study, we investigated CaTiO 3 films on a γ-Al 2 O 3 support to look for direct evidence of crystallinity in two-dimensional films. In previous research, CaTiO 3 film has proven itself a promising support for both noble metal catalysts [ 19 , 21 ] and Ni-based catalysts [ 12 ]. γ-Al 2 O 3 was chosen as the support because of its relatively poor crystallinity and low reactivity with CaTiO 3 .…”

Nanoscale interface engineering for solid oxide fuel cells using atomic layer deposition

“…In contrast, ALD offers the advantage of reproducibly introducing metal nanocatalysts with high uniformity even on complicated structures and easily depositing composite oxides with diverse compositions. [77][78][79][80][81][82][83][84][85][86] Recently, Tsampas reported an example of successful electrode activity enhancement using ALD by uniformly coating Pt nanocatalysts onto an LSCM electrode (Fig. 8a).…”

Metal Exsolution to Enhance the Catalytic Activity of Electrodes in Solid Oxide Fuel Cells

“…This would appear to be too thin to allow socketing of the metals. The metal-support interactions are dependent on the compositions of both the metal [78] and the perovskite [79], suggesting that the nature of these interactions is similar to chemical bonds.…”

“…This suggests that the CO oxidation reaction on the exsolved catalysts is significantly different from that which takes place on catalysts prepared by conventional methods. Suppression of CO chemisorption has been observed on a wide range of perovskite-supported metals, including Pt on CaTiO 3 [78] and LaCoO 3 [84], Ni on LaFeO 3 [73] and CaTiO 3 [83], and Rh on ATiO 3 (A=Ca, Sr and Ba) [79]. In the case of Pt on CaTiO 3 , the catalyst that was highly active for CO oxidation showed very low activities for hydrogenation reactions [78].…”