Phosphorous-doped molybdenum disulfide anchored on silicon as an efficient catalyst for photoelectrochemical hydrogen generation
Journal
Applied Catalysis B: Environmental
Journal Volume
263
Pages
-
Date Issued
2020
Author(s)
Abstract
Herein, molybdenum disulfide (MoS2) integrated on Si pyramids was used as a co-catalyst to improve charge separation efficiency. Various quantities of phosphorus (P) heteroatoms were doped into MoS2 materials to boost catalytic performance. Raman and extended X-ray absorption fine structure spectra showed that the introduction of P dopants increased the number of exposed edges and sulfur vacancies that acted as hydrogen evolution reaction (HER) active sites on MoS2 and enhanced photoelectrochemical activity. Density functional theory calculations revealed that the HER inert basal plane of MoS2 became catalytically active after P atoms doping. MoS1.75P0.25/Si pyramids presented the optimal onset potential of +0.29 V (vs. RHE) and current density −23.8 mA cm−2. A titanium dioxide (TiO2) layer was prepared through atomic layer deposition and served as a passivation layer that improved photocathode stability. The photocurrent retention of MoS1.75P0.25/10 nm TiO2/Si pyramids was 84.0% after 2 h of chronoamperometric measurement. © 2019 Elsevier B.V.
Subjects
Activated basal plane; Exposed Mo-edges and S-vacancies; Hydrogen evolution reaction; Molybdenum disulfide; Phosphorous atoms doping
SDGs
Other Subjects
Atomic layer deposition; Atoms; Catalysts; Density functional theory; Electrochemistry; Hydrogen evolution reaction; Hydrogen production; Layered semiconductors; Oxide minerals; Passivation; Silicon; Sulfur compounds; Titanium dioxide; X ray absorption; Basal planes; Catalytic performance; Efficient catalysts; Molybdenum disulfide; Phosphorous atoms; Photoelectrochemical hydrogen; Photoelectrochemicals; Titanium dioxides (TiO2); Molybdenum compounds
Type
journal article