Catalytic Hydrogen Evolution Reaction Enhancement on Vertically Aligned MoS2 by Synergistic Addition of Silver and Palladium

Itai Gerlitz, Mor Fiegenbaum-Raz, Maya Bar-Sadan, Hagai Cohen, Ariel Ismach, Brian A. Rosen

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Hybrid electrodes containing MoS2 with metals active for the hydrogen evolution reaction (HER) are highly desirable as they can provide a cost-effective and active route for producing hydrogen. It is well known that the technique used to facilitate such hybrid formation plays a critical role in the activity and stability of the electrode. Here we utilized a novel method for hybridization based on electron-beam deposition of Ag, Pd, and Mo to make precursor films which, upon sulfurization, formed hybrid electrodes based on vertically aligned molybdenum disulfide (VA-MoS2). We further modified the surface of these electrodes by exploiting galvanic replacement of palladium. Surprisingly, both hybridization techniques showed a synergistic effect between Pd and Ag, and enhanced activity was enabled by the presence of both metals. XPS, XRD, Raman spectroscopy, and FIB-EM were used to explore the root cause of the synergy. It appears that enhanced performance is based partially on the mutual solubility of Pd−Ag and the facile diffusion of Ag through the MoS2 film. Ag/VA-MoS2 modified by galvanic replacement provided 10 mA/cm2 at 210 mV of overpotential and was stable for up to 4000 cycles, surpassing the stability of previously reported Pd/MoS2 hybrids, making these techniques of interest for future generations of hybrid HER electrodes based on MoS2.

Original languageEnglish
Pages (from-to)4224-4232
Number of pages9
JournalChemElectroChem
Volume7
Issue number20
DOIs
StatePublished - 16 Oct 2020

Keywords

  • X-ray photoelectron spectroscopy
  • electron beam deposition
  • hybrid electrode
  • hydrogen evolution
  • molybdenum disulfide

ASJC Scopus subject areas

  • Catalysis
  • Electrochemistry

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