guest ::
| Home > Publications database > Size effects and active state formation of cobalt oxide nanoparticles during the oxygen evolution reaction |
| Home > Publications database > Size effects and active state formation of cobalt oxide nanoparticles during the oxygen evolution reaction |
| Journal Article | PUBDB-2022-07431 |
; ; ; ; ; ; ;
2022
Nature Publishing Group
London
This record in other databases: 
Please use a persistent id in citations: doi:10.1038/s41560-022-01083-w doi:10.3204/PUBDB-2022-07431
Abstract: Water electrolysis is a key technology to establish CO$_2$-neutral hydrogen production. Nonetheless, the near-surface structure of electrocatalysts during the anodic oxygen evolution reaction (OER) is still largely unknown, which hampers knowledge-driven optimization. Here using operando X-ray absorption spectroscopy and density functional theory calculations, we provide quantitative near-surface structural insights into oxygen-evolving CoO$_x$(OH)$_y$ nanoparticles by tracking their size-dependent catalytic activity down to 1 nm and their structural adaptation to OER conditions. We uncover a superior intrinsic OER activity of sub-5 nm nanoparticles and a size-dependent oxidation leading to a near-surface Co–O bond contraction during OER. We find that accumulation of oxidative charge within the surface Co$^{3+}$O$_6$ units triggers an electron redistribution and an oxyl radical as predominant surface-terminating motif. This contrasts the long-standing view of high-valent metal ions driving the OER, and thus, our advanced operando spectroscopy study provides much needed fundamental understanding of the oxygen-evolving near-surface chemistry.
; 
; 
; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Essential Science Indicators ; IF >= 40 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection
|
The record appears in these collections: |
PDF
PDF (PDFA)