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Title: Catalytic activity in lithium-treated core–shell MoOx/MoS2 nanowires

Journal Article · · Journal of Physical Chemistry. C
 [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)

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).

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Energy Information Administration (EIA)
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1255253
Report Number(s):
LA-UR-15-27897
Journal Information:
Journal of Physical Chemistry. C, Vol. 119, Issue 40; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 27 works
Citation information provided by
Web of Science

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Cited By (10)

Hydrogen adsorption engineering by intramolecular proton transfer on 2D nanosheets journal May 2018
Intense pulsed light, a promising technique to develop molybdenum sulfide catalysts for hydrogen evolution journal February 2019
Direct deposition of MoSe 2 nanocrystals onto conducting substrates: towards ultra-efficient electrocatalysts for hydrogen evolution journal January 2017
Atomic layer deposited molybdenum disulfide on Si photocathodes for highly efficient photoelectrochemical water reduction reaction journal January 2017
MoS 2 Quantum Dots@TiO 2 Nanotube Arrays: An Extended-Spectrum-Driven Photocatalyst for Solar Hydrogen Evolution journal May 2018
Fabrication of MoS2@g-C3N4 core-shell nanospheres for visible light photocatalytic degradation of toluene journal September 2018
Efficient hydrogen evolution in transition metal dichalcogenides via a simple one-step hydrazine reaction journal June 2016
Quantum-Dot-Mediated Controlled Synthesis of Dual Oxides of Molybdenum from MoS 2 : Quantification of Supercapacitor Efficacy journal November 2018
Recent Strategies for Improving the Catalytic Activity of 2D TMD Nanosheets Toward the Hydrogen Evolution Reaction journal February 2016
Facile Synthesis of Molybdenum Diselenide Layers for High-Performance Hydrogen Evolution Electrocatalysts journal May 2018

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