Cation vacancy stabilization of single-atomic-site Pt<sub>1</sub>/Ni(OH)<sub>x</sub> catalyst for diboration of alkynes and alkenes.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 29520021.
- Also identified by DOI 10.1038/s41467-018-03380-z and PMC identifier 5843605.
- 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
Development of single-atomic-site catalysts with high metal loading is highly desirable but proved to be very challenging. Although utilizing defects on supports to stabilize independent metal atoms has become a powerful method to fabricate single-atomic-site catalysts, little attention has been devoted to cation vacancy defects. Here we report a nickel hydroxide nanoboard with abundant Ni<sup>2+</sup> vacancy defects serving as the practical support to achieve a single-atomic-site Pt catalyst (Pt<sub>1</sub>/Ni(OH)<sub>x</sub>) containing Pt up to 2.3 wt% just by a simple wet impregnation method. The Ni<sup>2+</sup> vacancies are found to have strong stabilizing effect of single-atomic Pt species, which is determined by X-ray absorption spectrometry analyses and density functional theory calculations. This Pt<sub>1</sub>/Ni(OH)<sub>x</sub> catalyst shows a high catalytic efficiency in diboration of a variety of alkynes and alkenes, yielding an overall turnover frequency value upon reaction completion for phenylacetylene of ~3000 h<sup>-1</sup>, which is much higher than other reported heterogeneous catalysts.