Controllable Synthesis of Nanosized Amorphous MoS x Using Temporally Shaped Femtosecond Laser for Highly Efficient Electrochemical Hydrogen Production

Bo Li, Lan Jiang, Xin Li, Zhihua Cheng, Peng Ran, Pei Zuo, Liangti Qu, Jiatao Zhang, Yongfeng Lu

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Amorphous molybdenum sulfide (a-MoS x ) is regarded as a promising electrocatalyst for hydrogen evolution reaction (HER) due to its disorder structures with a significant number of defect-rich active sites. Here, a green, one-step, and controllable method is developed to photoregulate the chemical reactions and synthesize nanosized a-MoS x by temporally shaped femtosecond laser ablation of ammonium tetrathiomolybdate aqueous solution. By adjusting the laser energy and pulse delay to control photoinduced and/or photothermal-induced reduction/oxidation, the S to Mo ratio x can be modulated from 1.53 to 3.07 and the ratio of the Mo V defect species, bridging S 2 2− , and terminal S 2 2− ligands can be controlled. The optimized a-MoS x catalysts (x = 2.73) exhibit high catalytic activity with a low Tafel slope of 40 mV dec −1 , high double-layer capacitance of 74.47 mF cm −2 , and large current density of 516 mA cm −2 at an overpotential of 250 mV. The high catalytic activity can be mainly attributed to Mo V defect species and bridging S 2 2− ligands, or most likely dominated by the Mo V defect species. This study not only provides an alternatively controllable method to prepare a-MoS x as efficient HER catalysts but also contributes to the understanding of the origin of its catalytic activity.

Original languageEnglish (US)
Article number1806229
JournalAdvanced Functional Materials
Volume29
Issue number1
DOIs
StatePublished - Jan 4 2019

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hydrogen production
Hydrogen production
Ultrashort pulses
catalytic activity
Catalyst activity
Defects
defects
synthesis
lasers
Hydrogen
Ligands
molybdenum sulfides
catalysts
ligands
Catalysts
electrocatalysts
Electrocatalysts
Laser ablation
hydrogen
Molybdenum

Keywords

  • controllable synthesis
  • hydrogen evolution reaction
  • nanosized a-MoS
  • photoregulation of chemical reactions
  • temporally shaped femtosecond laser

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Controllable Synthesis of Nanosized Amorphous MoS x Using Temporally Shaped Femtosecond Laser for Highly Efficient Electrochemical Hydrogen Production . / Li, Bo; Jiang, Lan; Li, Xin; Cheng, Zhihua; Ran, Peng; Zuo, Pei; Qu, Liangti; Zhang, Jiatao; Lu, Yongfeng.

In: Advanced Functional Materials, Vol. 29, No. 1, 1806229, 04.01.2019.

Research output: Contribution to journalArticle

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