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Ultrathin Ni-Co double hydroxide nanosheets with conformal graphene coating for highly active oxygen evolution reaction and lithium ion battery anode materials.
- Source :
-
Chemical Engineering Journal . Nov2017, Vol. 327, p9-17. 9p. - Publication Year :
- 2017
-
Abstract
- Ultrathin graphene wrapped Ni-Co double hydroxide nanosheets (∼10 nm) were synthesized by a facile and rapid electrodeposition process, and evaluated as electrocatalysts for oxygen evolution reaction (OER) and anode materials for Li-ion batteries. The conformal graphene coating on the nanosheets significantly increased the conductivity and surface area of the Ni-Co double hydroxide electrodes. As the OER electrocatalyst, the Ni-Co graphene hybrids show a superior catalytic activity with a small Tafel slope of 67 mV per decade due to the synergy between the abundant active sites of the Ni-Co hydroxides and the conductive graphene coating, and a modest overpotential of 280 mV at a current density of 10 mA cm −2 . Impressively, the electrodes exhibit an excellent stability evaluated by chronopotentiometry under a high current density of 30 mA cm −2 for 12 h. As Li-ion battery anode, the materials show a high specific capacity of 373 mA h g −1 up to 500 cycles even at a high current density of 1000 mA g −1 . This study provides a new strategy to develop robust and affordable alternative OER catalyst and anode material for high-performance lithium ion batteries. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 13858947
- Volume :
- 327
- Database :
- Academic Search Index
- Journal :
- Chemical Engineering Journal
- Publication Type :
- Academic Journal
- Accession number :
- 124934109
- Full Text :
- https://doi.org/10.1016/j.cej.2017.06.080