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This content will become publicly available on May 17, 2017

Title: Vertically oriented arrays of ReS2 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, ReS2 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 ReS2 sheets, and second, it exposes the sharp edges and corners of the ReS2 sheets. We show that these structural features of the vertically grown ReS2 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 ReS2 catalyst is retained above 750 mA h g–1, with only ~0.063% capacity decay per cycle, much better than the baseline battery (without ReS2), which shows ~0.184% capacity decay per cycle under the same test conditions. As a HER catalyst, the vertical ReS2 provides very small onset overpotential (<100 mV) and an exceptional exchange-current density (~67.6 μA/cm2), which is vastlymore » superior to the baseline electrode without ReS2.« 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:
OSTI Identifier:
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