Cascade anchoring strategy for general mass production of high-loading single-atomic metal-nitrogen catalysts.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 30894539.
- Also identified by DOI 10.1038/s41467-019-09290-y and PMC identifier 6426845.
- 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
Although single-atomically dispersed metal-N<sub>x</sub> on carbon support (M-NC) has great potential in heterogeneous catalysis, the scalable synthesis of such single-atom catalysts (SACs) with high-loading metal-N<sub>x</sub> is greatly challenging since the loading and single-atomic dispersion have to be balanced at high temperature for forming metal-N<sub>x</sub>. Herein, we develop a general cascade anchoring strategy for the mass production of a series of M-NC SACs with a metal loading up to 12.1 wt%. Systematic investigation reveals that the chelation of metal ions, physical isolation of chelate complex upon high loading, and the binding with N-species at elevated temperature are essential to achieving high-loading M-NC SACs. As a demonstration, high-loading Fe-NC SAC shows superior electrocatalytic performance for O<sub>2</sub> reduction and Ni-NC SAC exhibits high electrocatalytic activity for CO<sub>2</sub> reduction. The strategy paves a universal way to produce stable M-NC SAC with high-density metal-N<sub>x</sub> sites for diverse high-performance applications.