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Title: Catalytic activity in lithium-treated core–shell MoO x/MoS 2 nanowires

Significant interest has grown in the development of earth-abundant and efficient catalytic materials for hydrogen generation. Layered transition metal dichalcogenides present opportunities for efficient electrocatalytic systems. Here, we report the modification of 1D MoO x/MoS 2 core–shell nanostructures by lithium intercalation and the corresponding changes in morphology, structure, and mechanism of H 2 evolution. The 1D nanowires exhibit significant improvement in H 2 evolution properties after lithiation, reducing the hydrogen evolution reaction (HER) onset potential by ~50 mV and increasing the generated current density by ~600%. The high electrochemical activity in the nanowires results from disruption of MoS 2 layers in the outer shell, leading to increased activity and concentration of defect sites. This is in contrast to the typical mechanism of improved catalysis following lithium exfoliation, i.e., crystal phase transformation. As a result, these structural changes are verified by a combination of Raman and X-ray photoelectron spectroscopy (XPS).
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [5] ;  [2] ;  [4] ;  [2] ;  [5] ;  [2]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of Louisville, Louisville, KY (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Rutgers Univ., Piscataway, NJ (United States)
  4. Rutgers Univ., Piscataway, NJ (United States)
  5. Univ. of Louisville, Louisville, KY (United States)
Publication Date:
Report Number(s):
LA-UR-15-27897
Journal ID: ISSN 1932-7447
Grant/Contract Number:
AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Journal of Physical Chemistry. C
Additional Journal Information:
Journal Volume: 119; Journal Issue: 40; Journal ID: ISSN 1932-7447
Publisher:
American Chemical Society
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Energy Information Administration (EIA)
Country of Publication:
United States
Language:
English
Subject:
08 HYDROGEN
OSTI Identifier:
1255253

Cummins, Dustin R., Martinez, Ulises, Kappera, Rajesh, Voiry, Damien, Martinez-Garcia, Alejandro, Jasinski, Jacek, Kelly, Dan, Chhowalla, Manish, Mohite, Aditya D., Sunkara, Mahendra K., and Gupta, Gautam. Catalytic activity in lithium-treated core–shell MoOx/MoS2 nanowires. United States: N. p., Web. doi:10.1021/acs.jpcc.5b05640.
Cummins, Dustin R., Martinez, Ulises, Kappera, Rajesh, Voiry, Damien, Martinez-Garcia, Alejandro, Jasinski, Jacek, Kelly, Dan, Chhowalla, Manish, Mohite, Aditya D., Sunkara, Mahendra K., & Gupta, Gautam. Catalytic activity in lithium-treated core–shell MoOx/MoS2 nanowires. United States. doi:10.1021/acs.jpcc.5b05640.
Cummins, Dustin R., Martinez, Ulises, Kappera, Rajesh, Voiry, Damien, Martinez-Garcia, Alejandro, Jasinski, Jacek, Kelly, Dan, Chhowalla, Manish, Mohite, Aditya D., Sunkara, Mahendra K., and Gupta, Gautam. 2015. "Catalytic activity in lithium-treated core–shell MoOx/MoS2 nanowires". United States. doi:10.1021/acs.jpcc.5b05640. https://www.osti.gov/servlets/purl/1255253.
@article{osti_1255253,
title = {Catalytic activity in lithium-treated core–shell MoOx/MoS2 nanowires},
author = {Cummins, Dustin R. and Martinez, Ulises and Kappera, Rajesh and Voiry, Damien and Martinez-Garcia, Alejandro and Jasinski, Jacek and Kelly, Dan and Chhowalla, Manish and Mohite, Aditya D. and Sunkara, Mahendra K. and Gupta, Gautam},
abstractNote = {Significant interest has grown in the development of earth-abundant and efficient catalytic materials for hydrogen generation. Layered transition metal dichalcogenides present opportunities for efficient electrocatalytic systems. Here, we report the modification of 1D MoOx/MoS2 core–shell nanostructures by lithium intercalation and the corresponding changes in morphology, structure, and mechanism of H2 evolution. The 1D nanowires exhibit significant improvement in H2 evolution properties after lithiation, reducing the hydrogen evolution reaction (HER) onset potential by ~50 mV and increasing the generated current density by ~600%. The high electrochemical activity in the nanowires results from disruption of MoS2 layers in the outer shell, leading to increased activity and concentration of defect sites. This is in contrast to the typical mechanism of improved catalysis following lithium exfoliation, i.e., crystal phase transformation. As a result, these structural changes are verified by a combination of Raman and X-ray photoelectron spectroscopy (XPS).},
doi = {10.1021/acs.jpcc.5b05640},
journal = {Journal of Physical Chemistry. C},
number = 40,
volume = 119,
place = {United States},
year = {2015},
month = {9}
}