Catalytic Activity in Lithium-Treated Core-Shell MoO_x/MoS₂ Nanowires

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 - Mohite, Aditya D.

AU - Sunkara, Mahendra K.

AU - Gupta, Gautam

N1 - Publisher Copyright: © 2015 American Chemical Society.

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).

UR - https://www.scopus.com/pages/publications/84943760874

UR - https://www.scopus.com/pages/publications/84943760874#tab=citedBy

U2 - 10.1021/acs.jpcc.5b05640

DO - 10.1021/acs.jpcc.5b05640

M3 - Article

SN - 1932-7447

VL - 119

SP - 22908

EP - 22914

JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

IS - 40

ER -