Back to Search
Start Over
Co-catalytic Effects of CoS 2 on the Activity of the MoS 2 Catalyst for Electrochemical Hydrogen Evolution.
- Source :
-
Langmuir : the ACS journal of surfaces and colloids [Langmuir] 2017 Jun 13; Vol. 33 (23), pp. 5628-5635. Date of Electronic Publication: 2017 Jun 02. - Publication Year :
- 2017
-
Abstract
- MoS <subscript>2</subscript> is a promising material to replace the Pt catalyst in the electrochemical hydrogen evolution reaction (HER). It is well known that the activity of the MoS <subscript>2</subscript> catalyst in the HER is significantly promoted by doping cobalt atoms. Recently, the Co-Mo-S phase, in which cobalt atoms decorate the edge positions of the MoS <subscript>2</subscript> slabs, has been identified as a co-catalytic phase in the Co-doped MoS <subscript>2</subscript> (Co-MoS <subscript>x</subscript> ) with low Co content. Here, we report the effect of the incorporation of cobalt atoms in the chemical state of the Co-MoS <subscript>x</subscript> catalyst, which gives rise to the co-catalytic effect. Co-MoS <subscript>x</subscript> catalysts with various Co contents were prepared on carbon fiber paper by a simple hydrothermal process. On the Co-MoS <subscript>x</subscript> catalyst with high Co content (Co/Mo ≈ 2.3), a dramatically higher catalytic activity was observed compared to that for the catalyst with low Co content (Co/Mo ≈ 0.36). Furthermore, the co-catalytic phase in the Co-MoS <subscript>x</subscript> catalyst with the high Co content was found not to be the Co-Mo-S phase but was identified as CoS <subscript>2</subscript> by Raman spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and transmission electron microscopy. It is believed that CoS <subscript>2</subscript> is an alternative choice to co-catalyze HER on MoS <subscript>2</subscript> -based catalysts.
Details
- Language :
- English
- ISSN :
- 1520-5827
- Volume :
- 33
- Issue :
- 23
- Database :
- MEDLINE
- Journal :
- Langmuir : the ACS journal of surfaces and colloids
- Publication Type :
- Academic Journal
- Accession number :
- 28544849
- Full Text :
- https://doi.org/10.1021/acs.langmuir.7b00580