Abstract
Two-dimensional material based heterostructures produce novel phenomena due to distinctive interactions between stacked layers. This paper details fabrication of van der Waals heterostructure consisting of layered MoS 2 and WSe 2 on FTO substrates by combining solution bath and radio-frequency sputtering. Raman scattering confirmed WSe 2 /MoS 2 heterostructure formation, X-ray photoelectron spectroscopy surface profile detailed the heterostructure composition, and depth profile showed heterostructure interfacial structure with stacked WSe 2 and MoS 2 layers on the FTO substrate. Surface properties confirmed the WSe 2 /MoS 2 heterostructure formed a multi-structured array of nanograins, and high resolution electron micrographs confirmed vertically formed layered fringes. Hydrogen evolution showed enhanced electrocatalytic behavior with 116 mV overpotential at 10 mA/cm 2 and 76 mV/decade Tafel slope. Electrocatalytic property robustness was confirmed by over 20 h continuous hydrogen evolution reaction in an acidic solution. Enhanced electrocatalytic outcomes were due to increased interfacial hole-electron separation, dispersing active facets through the interface. The stacked layered structure provides a new avenue for two-dimensional heterostructures for energy harvesting devices.
Original language | English |
---|---|
Pages (from-to) | 611-620 |
Number of pages | 10 |
Journal | Applied Surface Science |
Volume | 480 |
DOIs | |
State | Published - 30 Jun 2019 |
Keywords
- Electrocatalyst
- Heterostructures
- Hydrogen evolution
- MoS
- TEM
- WSe