Volume 14, Issue 14 1704150
Full Paper

Dual-Native Vacancy Activated Basal Plane and Conductivity of MoSe2 with High-Efficiency Hydrogen Evolution Reaction

Daqiang Gao

Daqiang Gao

Key Laboratory for Magnetism and Magnetic Materials of MOE, Key Laboratory of Special Function Materials and Structure Design of MOE, Lanzhou University, Lanzhou, 730000 P. R. China

Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore, 117575 Singapore

Search for more papers by this author
Baorui Xia

Baorui Xia

Key Laboratory for Magnetism and Magnetic Materials of MOE, Key Laboratory of Special Function Materials and Structure Design of MOE, Lanzhou University, Lanzhou, 730000 P. R. China

Search for more papers by this author
Yanyan Wang

Yanyan Wang

Lanzhou Jinchuan Advanced Materials Technology Co., Ltd., Lanzhou, 730000 P. R. China

Search for more papers by this author
Wen Xiao

Wen Xiao

Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore, 117575 Singapore

Search for more papers by this author
Pinxian Xi

Pinxian Xi

The Research Center of Biomedical Nanotechnology, Lanzhou University, Lanzhou, 730000 P. R. China

Search for more papers by this author
Desheng Xue

Corresponding Author

Desheng Xue

Key Laboratory for Magnetism and Magnetic Materials of MOE, Key Laboratory of Special Function Materials and Structure Design of MOE, Lanzhou University, Lanzhou, 730000 P. R. China

E-mail: [email protected], [email protected]Search for more papers by this author
Jun Ding

Corresponding Author

Jun Ding

Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore, 117575 Singapore

E-mail: [email protected], [email protected]Search for more papers by this author
First published: 20 February 2018
Citations: 138

Abstract

Although transition metal dichalcogenide MoSe2 is recognized as one of the low-cost and efficient electrocatalysts for the hydrogen evolution reaction (HER), its thermodynamically stable basal plane and semiconducting property still hamper the electrocatalytic activity. Here, it is demonstrated that the basal plane and edges of 2H-MoSe2 toward HER can be activated by introducing dual-native vacancy. The first-principle calculations indicate that both the Se and Mo vacancies together activate the electrocatalytic sites in the basal plane and edges of MoSe2 with the optimal hydrogen adsorption free energy (ΔGH*) of 0 eV. Experimentally, 2D MoSe2 nanosheet arrays with a large amount of dual-native vacancies are fabricated as a catalytic working electrode, which possesses an overpotential of 126 mV at a current density of 100 mV cm−2, a Tafel slope of 38 mV dec−1, and an excellent long-term durability. The findings pave a rational pathway to trigger the activity of inert MoSe2 toward HER and also can be extended to other layered dichalcogenide.

Conflict of Interest

The authors declare no conflict of interest.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.