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Title: Vertically oriented arrays of ReS 2 nanosheets for electrochemical energy storage and electrocatalysis

Here, transition-metal dichalcogenide (TMD) nanolayers show potential as high-performance catalysts in energy conversion and storage devices. Synthetic TMDs produced by chemical-vapor deposition (CVD) methods tend to grow parallel to the growth substrate. Here, we show that with the right precursors and appropriate tuning of the CVD growth conditions, ReS 2 nanosheets can be made to orient perpendicular to the growth substrate. This accomplishes two important objectives; first, it drastically increases the wetted or exposed surface area of the ReS 2 sheets, and second, it exposes the sharp edges and corners of the ReS 2 sheets. We show that these structural features of the vertically grown ReS 2 sheets can be exploited to significantly improve their performance as polysulfide immobilizers and electrochemical catalysts in lithium–sulfur (Li–S) batteries and in hydrogen evolution reactions (HER). After 300 cycles, the specific capacity of the Li–S battery with vertical ReS 2 catalyst is retained above 750 mA h g –1, with only ~0.063% capacity decay per cycle, much better than the baseline battery (without ReS 2), which shows ~0.184% capacity decay per cycle under the same test conditions. As a HER catalyst, the vertical ReS 2 provides very small onset overpotential (<100 mV) and anmore » exceptional exchange-current density (~67.6 μA/cm 2), which is vastly superior to the baseline electrode without ReS 2.« less
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  1. Rensselaer Polytechnic Institute, Troy, NY (United States)
  2. Univ. of Toronto, Toronto, ON (Canada)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Nano Letters
Additional Journal Information:
Journal Volume: 16; Journal Issue: 6; Journal ID: ISSN 1530-6984
American Chemical Society
Research Org:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; 2D materials; ReS2; Energy Storage; STEM; chemical vapor deposition; hydrogen evolution reaction; lithium−sulfur batteries; ReS2 nanosheets; Transition metal dichalcogenides
OSTI Identifier: