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Ag2S nanoparticle-decorated MoS2 for enhanced electrocatalytic and photoelectrocatalytic activity in water splitting.
- Source :
- Dalton Transactions: An International Journal of Inorganic Chemistry; 1/14/2017, Vol. 46 Issue 2, p483-490, 8p
- Publication Year :
- 2017
-
Abstract
- In this article, a novel Ag<subscript>2</subscript>S nanoparticle-decorated MoS<subscript>2</subscript> composite (A@M) was synthesized through a facile in situ growth of the monoclinic crystallographic Ag<subscript>2</subscript>S on MoS<subscript>2</subscript> nanosheets. The A@M composite was used as a catalyst in water splitting which exhibits higher electrocatalytic and photoelectrocatalytic activity than the respective pure MoS<subscript>2</subscript> and Ag<subscript>2</subscript>S counterparts. Experimental results indicate that the as-prepared A@M composite with an optimal Ag<subscript>2</subscript>S/MoS<subscript>2</subscript> molar ratio of 16.30% (16%A@M) shows the best catalytic performance with low overpotentials (110 mV for V<subscript>oc</subscript>, 190 mV for onset overpotential, 208 mV for the current density of 20 mA cm<superscript>−2</superscript>), a small Tafel slope (42 mV dec<superscript>−1</superscript>), and a high photocurrent (82 μA cm<superscript>−2</superscript> under an applied potential of 0.4 V). The enhanced electrocatalytic activity is associated with the improved electrical conductivity resulting from the stretched MoS<subscript>2</subscript> nanosheets and the enriched active sites due to the decorated Ag<subscript>2</subscript>S particles. The formation of a type II heterojunction structure at the interface between Ag<subscript>2</subscript>S and MoS<subscript>2</subscript> facilitates the separation of photogenerated charge carriers, and thus is responsible for the enhanced photoelectrocatalytic activity and photocatalytic H<subscript>2</subscript> production rate (628 μmol h<superscript>−1</superscript> g<superscript>−1</superscript>). This work suggests a promising choice to overcome the intrinsic drawbacks of MoS<subscript>2</subscript> nanostructures for the application in hydrogen evolution. [ABSTRACT FROM AUTHOR]
- Subjects :
- WATER electrolysis
SILVER
HYDROGEN evolution reactions
Subjects
Details
- Language :
- English
- ISSN :
- 14779226
- Volume :
- 46
- Issue :
- 2
- Database :
- Complementary Index
- Journal :
- Dalton Transactions: An International Journal of Inorganic Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 120540929
- Full Text :
- https://doi.org/10.1039/c6dt04079a