title: Directional Construction of Vertical Nitrogen-Doped 1T-2H MoSe2/Graphene Shell/Core Nanoflake Arrays for Efficient Hydrogen Evolution Reaction.
abstract: The low utilization of active sites and sluggish reaction kinetics of MoSe2severely impede its commercial application as electrocatalyst for hydrogen evolution reaction (HER). To address these two issues, the first example of introducing 1T MoSe2and N dopant into vertical 2H MoSe2/graphene shell/core nanoflake arrays that remarkably boost their HER activity is herein described. By means of the improved conductivity, rich catalytic active sites and highly accessible surface area as a result of the introduction of 1T MoSe2and N doping as well as the unique structural features, the N-doped 1T-2H MoSe2/graphene (N-MoSe2/VG) shell/core nanoflake arrays show substantially enhanced HER activity. Remarkably, the N-MoSe2/VG nanoflakes exhibit a relatively low onset potential of 45 mV and overpotential of 98 mV (vs RHE) at 10 mA cm-2with excellent long-term stability (no decay after 20 000 cycles), outperforming most of the recently reported Mo-based electrocatalysts. The success of improving the electrochemical performance via the introduction of 1T phase and N dopant offers new opportunities in the development of high-performance MoSe2-based electrodes for other energy-related applications.
authors.affiliation: State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, and Department of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, P. R. China.
authors.forename: Shengjue
authors.initials: S
authors.lastname: Deng
authors.affiliation: State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, and Department of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, P. R. China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Zhong
authors.affiliation: MOE of the Key Laboratory of Bioinorganic and Synthetic Chemistry, KLGHEI of Environment and Energy Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510275, China.
authors.forename: Yinxiang
authors.initials: Y
authors.lastname: Zeng
authors.affiliation: School of Engineering, Nanyang Polytechnic, Singapore, 569830.
authors.forename: Yadong
authors.initials: Y
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, and Department of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, P. R. China.
authors.forename: Zhujun
authors.initials: Z
authors.lastname: Yao
authors.affiliation: College of Materials and Chemical Engineering, Hainan University, Haikou, 570228, China.
authors.forename: Fan
authors.initials: F
authors.lastname: Yang
authors.affiliation: College of Materials and Chemical Engineering, Hainan University, Haikou, 570228, China.
authors.forename: Shiwei
authors.initials: S
authors.lastname: Lin
authors.affiliation: State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, and Department of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, P. R. China.
authors.forename: Xiuli
authors.initials: X
authors.lastname: Wang
authors.affiliation: MOE of the Key Laboratory of Bioinorganic and Synthetic Chemistry, KLGHEI of Environment and Energy Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510275, China.
authors.forename: Xihong
authors.initials: X
authors.lastname: Lu
authors.affiliation: State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, and Department of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, P. R. China.
authors.forename: Xinhui
authors.initials: X
authors.lastname: Xia
authors.affiliation: State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, and Department of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, P. R. China.
authors.forename: Jiangping
authors.initials: J
authors.lastname: Tu
keywords: graphene; hydrogen evolution reaction; molybdenum selenide; nitrogen doping; shell/core