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Facet-Dependent Surface Restructuring on Nickel (Oxy)hydroxides: A Self-Activation Process for Enhanced Oxygen Evolution Reaction.
- Source :
-
Journal of the American Chemical Society [J Am Chem Soc] 2024 Jun 05; Vol. 146 (22), pp. 15219-15229. Date of Electronic Publication: 2024 May 22. - Publication Year :
- 2024
-
Abstract
- Unraveling the catalyst surface structure and behavior during reactions is essential for both mechanistic understanding and performance optimization. Here we report a phenomenon of facet-dependent surface restructuring intrinsic to β-Ni(OH) <subscript>2</subscript> catalysts during oxygen evolution reaction (OER), discovered by the correlative ex situ and operando characterization. The ex situ study after OER reveals β-Ni(OH) <subscript>2</subscript> restructuring at the edge facets to form nanoporous Ni <subscript>1- x </subscript> O, which is Ni deficient containing Ni <superscript>3+</superscript> species. Operando liquid transmission electron microscopy (TEM) and Raman spectroscopy further identify the active role of the intermediate β-NiOOH phase in both the OER catalysis and Ni <subscript>1 -x </subscript> O formation, pinpointing the complete surface restructuring pathway. Such surface restructuring is shown to effectively increase the exposed active sites, accelerate Ni oxidation kinetics, and optimize *OH intermediate bonding energy toward fast OER kinetics, which leads to an extraordinary activity enhancement of ∼16-fold. Facilitated by such a self-activation process, the specially prepared β-Ni(OH) <subscript>2</subscript> with larger edge facets exhibits a 470-fold current enhancement than that of the benchmark IrO <subscript>2</subscript> , demonstrating a promising way to optimize metal-(oxy)hydroxide-based catalysts.
Details
- Language :
- English
- ISSN :
- 1520-5126
- Volume :
- 146
- Issue :
- 22
- Database :
- MEDLINE
- Journal :
- Journal of the American Chemical Society
- Publication Type :
- Academic Journal
- Accession number :
- 38775440
- Full Text :
- https://doi.org/10.1021/jacs.4c02292