Controllable Edge Exposure of MoS 2 for Efficient Hydrogen Evolution with High Current Density

Zexia Zhang, Yuanxi Wang, Xiangxing Leng, Vincent Henry Crespi, Feiyu Kang, Ruitao Lv

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

MoS 2 -based electrocatalysts are promising cost-effective replacements for Pt-based catalysts for hydrogen evolution by water splitting, yet achieving high current density at low overpotential remains a challenge. Herein, a binder-free electrode of MoS 2 /CNF (carbon nanofiber) is prepared by electrospinning and subsequent thermal treatment. The growth of MoS 2 nanoplates contained within or protruding out from the CNF can be controlled by adding urea or ammonium bicarbonate to the electrospinning precursors, due to the cross-linking effects of urea and the increased porosity caused by pyrolysis of ammonium bicarbonate allowing growth through pores in the CNF. By virtue of the abundant exposed edges in this microstructure and strong bonding between the catalyst and the conductive carbon network, the composite material exhibits ultrahigh electrocatalytic hydrogen evolution activity in acidic solutions, with current densities of 500 and 1000 mA/cm 2 at overpotentials of 380 and 450 mV, respectively, exceeding the performance of many reported MoS 2 -based catalysts and even commercial Pt/C catalysts. Thus, MoS 2 /CNF membranes show potential as efficient and flexible binder-free electrodes for electrocatalytic hydrogen production.

Original languageEnglish (US)
Pages (from-to)1268-1275
Number of pages8
JournalACS Applied Energy Materials
Volume1
Issue number3
DOIs
StatePublished - Mar 26 2018

Fingerprint

Hydrogen
Current density
Ammonium bicarbonate
Catalysts
Electrospinning
Urea
Binders
Electrodes
Carbon nanofibers
Electrocatalysts
Hydrogen production
Pyrolysis
Carbon
Porosity
Heat treatment
Membranes
Microstructure
Water
Composite materials
Costs

All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Chemical Engineering (miscellaneous)
  • Electrochemistry
  • Materials Chemistry
  • Electrical and Electronic Engineering

Cite this

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title = "Controllable Edge Exposure of MoS 2 for Efficient Hydrogen Evolution with High Current Density",
abstract = "MoS 2 -based electrocatalysts are promising cost-effective replacements for Pt-based catalysts for hydrogen evolution by water splitting, yet achieving high current density at low overpotential remains a challenge. Herein, a binder-free electrode of MoS 2 /CNF (carbon nanofiber) is prepared by electrospinning and subsequent thermal treatment. The growth of MoS 2 nanoplates contained within or protruding out from the CNF can be controlled by adding urea or ammonium bicarbonate to the electrospinning precursors, due to the cross-linking effects of urea and the increased porosity caused by pyrolysis of ammonium bicarbonate allowing growth through pores in the CNF. By virtue of the abundant exposed edges in this microstructure and strong bonding between the catalyst and the conductive carbon network, the composite material exhibits ultrahigh electrocatalytic hydrogen evolution activity in acidic solutions, with current densities of 500 and 1000 mA/cm 2 at overpotentials of 380 and 450 mV, respectively, exceeding the performance of many reported MoS 2 -based catalysts and even commercial Pt/C catalysts. Thus, MoS 2 /CNF membranes show potential as efficient and flexible binder-free electrodes for electrocatalytic hydrogen production.",
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Controllable Edge Exposure of MoS 2 for Efficient Hydrogen Evolution with High Current Density . / Zhang, Zexia; Wang, Yuanxi; Leng, Xiangxing; Crespi, Vincent Henry; Kang, Feiyu; Lv, Ruitao.

In: ACS Applied Energy Materials, Vol. 1, No. 3, 26.03.2018, p. 1268-1275.

Research output: Contribution to journalArticle

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AU - Lv, Ruitao

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