Wafer Scale Phase-Engineered 1T- and 2H-MoSe2/Mo Core–Shell 3D-Hierarchical Nanostructures toward Efficient Electrocatalytic Hydrogen Evolution Reaction

Yindong Qu, Henry Medina, Sheng Wen Wang, Yi Chung Wang, Chia Wei Chen, Teng Yu Su, Arumugam Manikandan, Kuangye Wang, Yu Chuan Shih, Je Wei Chang, Hao-Chung Kuo, Chi Yung Lee, Shih Yuan Lu, Guozhen Shen, Zhiming M. Wang*, Yu Lun Chueh

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

120 Scopus citations

Abstract

An experiment was conducted to demonstrate that the MoSe2/Mo core-shell hierarchical nanostructures by a low-temperature plasma-assisted selenization process on the Mo 3D-hierarchical nanostructures with controlled shapes deposited by a glancing angle deposition system (GLAD) system. The mixed phases of MoSe2/Mo core?shell hierarchical nanostructures can be achieved at the low selenization temperature of 400°C, whereas the 2H-MoSe2/Mo core-shell 3D-hierarchical nanostructures dominate once the plasma-assisted selenization temperature exceeds 500°C. In particular, the mixed MoSe2/Mo core-shell nanoscrews exhibit the highest catalytic activities, with a Tafel slope as low as 34.7 mV dec-1, which is close to the theoretical value of 29 mV dec-1 and a low potential of -166 mV at J = 10 mA cm-2 dominated by a Volmer-Tafel reaction for the ideal hydrogen evolution reaction (HER) process. The high catalytic activities are attributed to the increased density of exposed edges and the metallic phase of the MoSe2 shell, providing a fast charge transfer.

Original languageEnglish
Pages (from-to)9831-9838
Number of pages8
JournalAdvanced Materials
Volume28
Issue number44
DOIs
StatePublished - 1 Jan 2016

Keywords

  • MoSe
  • MoSe/Mo hierarchical nanostructures
  • glancing angle deposition
  • hydrogen evolution reaction
  • selenization

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