Catalytic activity in lithium-treated core–shell MoOx/MoS2 nanowires
Abstract
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).
- Authors:
-
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of Louisville, Louisville, KY (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Rutgers Univ., Piscataway, NJ (United States)
- Rutgers Univ., Piscataway, NJ (United States)
- Univ. of Louisville, Louisville, KY (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE Energy Information Administration (EIA)
- OSTI Identifier:
- 1255253
- Report Number(s):
- LA-UR-15-27897
Journal ID: ISSN 1932-7447
- Grant/Contract Number:
- AC52-06NA25396
- Resource 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
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 08 HYDROGEN
Citation Formats
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., 2015.
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. https://doi.org/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. Tue .
"Catalytic activity in lithium-treated core–shell MoOx/MoS2 nanowires". United States. https://doi.org/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 = {Tue Sep 22 00:00:00 EDT 2015},
month = {Tue Sep 22 00:00:00 EDT 2015}
}
Web of Science
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