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Preparation of heterogeneous NiCo2S4/Ru composite electrode materials and their electrocatalytic properties for hydrogen evolution.
- Source :
- New Journal of Chemistry; 6/14/2022, Vol. 46 Issue 22, p10920-10926, 7p
- Publication Year :
- 2022
-
Abstract
- In order to increase the effective electrochemically active area of electrocatalyst materials and improve their electrocatalytic hydrogen evolution performance, nano-porous Ni–Co alloys were prepared by rapid solidification and dealloying methods. After that, bimetallic sulfides (NiCo<subscript>2</subscript>S<subscript>4</subscript>) were formed in situ by vapor deposition, then Ru and RuS<subscript>2</subscript> which have excellent intrinsic catalytic activity were adhered to the NiCo<subscript>2</subscript>S<subscript>4</subscript> surface by a solvothermal method. Meanwhile, the Ru content was regulated to prepare the NiCo<subscript>2</subscript>S<subscript>4</subscript>/Ru electrode which was used to figure out the best component and structure for hydrogen evolution. Research shows that when the Ru content reaches 60% (wt/%), the Ru element formed a three-dimensional network flake structure and covered the NiCo<subscript>2</subscript>S<subscript>4</subscript> surface. The active area for the reaction (C<subscript>dl</subscript> = 27.6 mF cm<superscript>−2</superscript>) and electron transfer ability (R<subscript>ct</subscript> = 0.487 Ω cm<superscript>−2</superscript>) were increased because of the formation of the heterostructure and surface modification. At a current density of 50 mA cm<superscript>−2</superscript>, the NiCo<subscript>2</subscript>S<subscript>4</subscript>/Ru (60%) composite electrode possessed fast HER kinetics with a hydrogen evolution overpotential of 70 mV and a Tafel slope of 76 mV dec<superscript>−1</superscript>, whose electrocatalytic properties are much better than those of NiCo<subscript>2</subscript>S<subscript>4</subscript>/RuS<subscript>2</subscript> with the same Ru content. The NiCo<subscript>2</subscript>S<subscript>4</subscript>/Ru (60%) catalyst exhibited superior stability with a small increase in overpotential of just 10 mV after chronopotentiometry tests for 12 h at 10 mA cm<superscript>−2</superscript>. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 11440546
- Volume :
- 46
- Issue :
- 22
- Database :
- Complementary Index
- Journal :
- New Journal of Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 157296825
- Full Text :
- https://doi.org/10.1039/d2nj01576e