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Porous Cobalt-Nickel Hydroxide Nanosheets with Active Cobalt Ions for Overall Water Splitting.
- Source :
-
Small (Weinheim an der Bergstrasse, Germany) [Small] 2019 Feb; Vol. 15 (8), pp. e1804832. Date of Electronic Publication: 2019 Feb 04. - Publication Year :
- 2019
-
Abstract
- Low-cost and high-performance catalysts are of great significance for electrochemical water splitting. Here, it is reported that a laser-synthesized catalyst, porous Co <subscript>0.75</subscript> Ni <subscript>0.25</subscript> (OH) <subscript>2</subscript> nanosheets, is highly active for catalyzing overall water splitting. The porous nanosheets exhibit low overpotentials for hydrogen evolution reaction (95 mV@10 mA cm <superscript>-2</superscript> ) and oxygen evolution reaction (235 mV@10 mA cm <superscript>-2</superscript> ). As both anode and cathode catalysts, the porous nanosheets achieve a current density of 10 mA cm <superscript>-2</superscript> at an external voltage of 1.56 V, which is much lower than that of commercial Ir/C-Pt/C couple (1.62 V). Experimental and theoretical investigations reveal that numerous Co <superscript>3+</superscript> ions are generated on the pore wall of nanosheets, and the unique atomic structure around Co <superscript>3+</superscript> ions leads to appropriate electronic structure and adsorption energy of intermediates, thus accelerating hydrogen and oxygen evolution.<br /> (© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.)
Details
- Language :
- English
- ISSN :
- 1613-6829
- Volume :
- 15
- Issue :
- 8
- Database :
- MEDLINE
- Journal :
- Small (Weinheim an der Bergstrasse, Germany)
- Publication Type :
- Academic Journal
- Accession number :
- 30714319
- Full Text :
- https://doi.org/10.1002/smll.201804832