Phase-Reconstruction of S-Doped (NiCo)<sub>6</sub>W<sub>6</sub>C for Efficient and Stable Oxygen Evolution Reaction Electrocatalysis.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 40913237.
- Also identified by DOI 10.1021/acs.nanolett.5c03691.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
Developing highly active and stable nonprecious electrocatalysts toward sluggish alkaline oxygen evolution reaction (OER) is essential for large-scale green hydrogen production via electrochemical water splitting. Here we report phase and surface co-reconstruction of S-doped (NiCo)<sub>6</sub>W<sub>6</sub>C nanoparticles into (NiCo)C<sub><i>x</i></sub> with amorphous electroactive NiCoOOH layer for highly efficient alkaline OER by W dissolution and NiCo surface oxidation. The W dissolution results in the formation of Brønsted base WO<sub>4</sub><sup>2-</sup> ions, which electrostatically accumulate around electrode to promote water dissociation into abundant OH* intermediates, in situ constructing a locally strong alkaline microenvironment to facilitate OH* adsorption on NiCoOOH sites and trigger lattice-oxygen oxidation path. As a result, the heterostructure electrode exhibits superior OER electrocatalysis with low Tafel slope of ∼35 mV dec<sup>-1</sup> in 1 M KOH. It delivers high ampere-level current density of ∼1 A cm<sup>-2</sup> at a low overpotential of 275 mV, and maintains extraordinary stability for over 1000 h.