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Two‐Step Synthesis of Cobalt Iron Alloy Nanoparticles Embedded in Nitrogen‐Doped Carbon Nanosheets/Carbon Nanotubes for the Oxygen Evolution Reaction.
- Source :
- ChemSusChem; 7/20/2018, Vol. 11 Issue 14, p2358-2366, 9p
- Publication Year :
- 2018
-
Abstract
- Abstract: There is a vital need to explore highly efficient and stable non‐precious‐metal catalysts for the oxygen evolution reaction (OER) to reduce the overpotential and further improve the energy‐conversion efficiency. Herein, we report a unique and cost‐effective lyophilization and thermal treatment two‐step procedure to synthesize a high‐performance hybrid consisting of CoFe alloy nanoparticles embedded in N‐doped carbon nanosheets interspersed with carbon nanotubes (CoFe‐N‐CN/CNTs) hybrid. The lyophilization step during the catalyst preparation leads to a uniform dispersion of carbon‐like precursors and avoids the agglomeration of metal particles. In addition, the inserted CNTs and doped N in this hybrid provide a good electrical conductivity, an abundance of chemically active sites, good mass transport capability, and effective gas adsorption/release channels. All these lead to a high specific surface area of 240.67 m<superscript>2</superscript> g<superscript>−1</superscript>, favorable stability, and remarkable OER activities with an overpotential of only 285 mV at a current density of 10 mA cm<superscript>−2</superscript> and a Tafel slope of 51.09 mV dec<superscript>−1</superscript> in 1.0 m KOH electrolyte, which is even superior to commercial IrO<subscript>2</subscript> catalysts. The CoFe‐N‐CN/CNTs hybrid thus exhibits great potential as a highly efficient and earth‐abundant anode OER electrocatalyst. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 18645631
- Volume :
- 11
- Issue :
- 14
- Database :
- Complementary Index
- Journal :
- ChemSusChem
- Publication Type :
- Academic Journal
- Accession number :
- 130898808
- Full Text :
- https://doi.org/10.1002/cssc.201800961