Phosphorous-doped molybdenum disulfide anchored on silicon as an efficient catalyst for photoelectrochemical hydrogen generation

Chih Jung Chen, Vediyappan Veeramani, Yi Hsiu Wu, Anirudha Jena, Li Chang Yin, Ho Chang, Shu Fen Hu, Ru Shi Liu

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

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.

Original languageEnglish
Article number118259
JournalApplied Catalysis B: Environmental
Volume263
DOIs
Publication statusPublished - Apr 2020
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Environmental Science(all)
  • Process Chemistry and Technology

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