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. These structural changes are verified by a combination of Raman and X-ray photoelectron spectroscopy (XPS).
| Original language | English |
|---|---|
| Pages (from-to) | 22908-22914 |
| Number of pages | 7 |
| Journal | Journal of Physical Chemistry C |
| Volume | 119 |
| Issue number | 40 |
| DOIs | |
| Publication status | Published - Oct 8 2015 |
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ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Electronic, Optical and Magnetic Materials
- Surfaces, Coatings and Films
- Energy(all)
Cite this
Catalytic Activity in Lithium-Treated Core-Shell MoOx/MoS2 Nanowires. / 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.
In: Journal of Physical Chemistry C, Vol. 119, No. 40, 08.10.2015, p. 22908-22914.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Catalytic Activity in Lithium-Treated Core-Shell MoOx/MoS2 Nanowires
AU - Cummins, Dustin R.
AU - Martinez, Ulises
AU - Kappera, Rajesh
AU - Voiry, Damien
AU - Martinez-Garcia, Alejandro
AU - Jasinski, Jacek
AU - Kelly, Dan
AU - Chhowalla, Manish
AU - Mohite, Aditya D.
AU - Sunkara, Mahendra K.
AU - Gupta, Gautam
PY - 2015/10/8
Y1 - 2015/10/8
N2 - 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. These structural changes are verified by a combination of Raman and X-ray photoelectron spectroscopy (XPS).
AB - 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. These structural changes are verified by a combination of Raman and X-ray photoelectron spectroscopy (XPS).
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UR - http://www.scopus.com/inward/citedby.url?scp=84943760874&partnerID=8YFLogxK
U2 - 10.1021/acs.jpcc.5b05640
DO - 10.1021/acs.jpcc.5b05640
M3 - Article
VL - 119
SP - 22908
EP - 22914
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
SN - 1932-7447
IS - 40
ER -