The controlled disassembly of mesostructured perovskites as an avenue to fabricating high performance nanohybrid catalysts.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 28541308.
- Also identified by DOI 10.1038/ncomms15553 and PMC identifier 5458515.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Versatile superstructures composed of nanoparticles have recently been prepared using various disassembly methods. However, little information is known on how the structural disassembly influences the catalytic performance of the materials. Here we show how the disassembly of an ordered porous La<sub>0.6</sub>Sr<sub>0.4</sub>MnO<sub>3</sub> perovskite array, to give hexapod mesostructured nanoparticles, exposes a new crystal facet which is more active for catalytic methane combustion. On fragmenting three-dimensionally ordered macroporous (3DOM) structures in a controlled manner, via a process that has been likened to retrosynthesis, hexapod-shaped building blocks can be harvested which possess a mesostructured architecture. The hexapod-shaped perovskite catalyst exhibits excellent low temperature methane oxidation activity (T<sub>90%</sub>=438 °C; reaction rate=4.84 × 10<sup>-7</sup> mol m<sup>-2</sup> s<sup>-1</sup>). First principle calculations suggest the fractures, which occur at weak joints within the 3DOM architecture, afford a large area of (001) surface that displays a reduced energy barrier for hydrogen abstraction, thereby facilitating methane oxidation.