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Dual modulation of lattice strain and charge polarization induced by Co(OH)2/Ni(OH)2 interfaces for efficient oxygen evolution catalysis.
- Source :
- Journal of Materials Chemistry A; 6/14/2021, Vol. 9 Issue 22, p13279-13287, 9p
- Publication Year :
- 2021
-
Abstract
- Two-dimensional transition metal hydroxides are greatly limited in the application of the electrocatalytic oxygen evolution reaction (OER) due to its large and inert basal planes. Herein, we report a one-step in situ etching hydrothermal method to construct Co(OH)<subscript>2</subscript> and Ni(OH)<subscript>2</subscript> heterostructure nanomaterials, successfully activating the basal plane of Co(OH)<subscript>2</subscript>. The abundant lattice strains that appear at heterogeneous interfaces cause a downshift of the d-band center of Co in Co(OH)<subscript>2</subscript> and promote the desorption of oxygen during the OER process, which accelerates reaction kinetics of the OER and improves catalytic activity effectively. Furthermore, the electron interaction at the Co(OH)<subscript>2</subscript>/Ni(OH)<subscript>2</subscript> interfaces leads to charge polarization, which will regulate the adsorption and dissociation of H<subscript>2</subscript>O molecules and enhances mass and electron transfer. Owing to the above advantages of Co(OH)<subscript>2</subscript>/Ni(OH)<subscript>2</subscript> interfaces, the as-prepared composite catalysts show an excellent OER catalytic performance with a low overpotential of only about 270 mV at 20 mA cm<superscript>−2</superscript>, maintaining long-term catalytic stability for more than 24 h at 20 mA cm<superscript>−2</superscript>. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20507488
- Volume :
- 9
- Issue :
- 22
- Database :
- Complementary Index
- Journal :
- Journal of Materials Chemistry A
- Publication Type :
- Academic Journal
- Accession number :
- 150766916
- Full Text :
- https://doi.org/10.1039/d1ta01866c