Co-Doped MoSe2 Nanoflowers as Efficient Catalysts for Electrochemical Hydrogen Evolution Reaction (HER) in Acidic and Alkaline Media

Oded Zimron, Tamar Zilberman, Sunil R. Kadam, Sirshendu Ghosh, Shay Lee Kolatker, Alevtina Neyman, Ronen Bar-Ziv, Maya Bar-Sadan

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Transition metal dichalcogenides (TMDCs) based materials are considered as highly active alternatives to the precious Pt-based catalysts for the hydrogen evolution reaction (HER). In particular, MoSe2emerges as a promising catalyst due to its abundance and electrochemical stability, but further modifications are still required to enhance its performance, specifically in alkaline conditions. Here, we developed a method to obtain MoSe2with two cobalt doping patterns: homogeneously doped and edge doped nanoflowers, with abundant edge sites and extended surface area. The results show that low concentration of doping enhances the catalytic activity toward HER. Incorporation of cobalt as a substituent dopant within the layered structure of MoSe2appears to have two major contributions: it changes the chemical environment providing more active sites with favored hydrogen adsorption properties, and improves the charge transfer resistance and thus facilitates the HER kinetics. Moreover, the homogeneous and edge-doped nanoflowers show different pH-dependence of HER activity. Edge-doped samples exhibit significantly improved performance in acidic medium, while the overpotential increases in alkaline environment upon doping. A mechanistic explanation of the observed effect is proposed. This work opens up an additional path for improving the catalytic activity of TMDCs in acidic or alkaline medium using a simple and facile method with only small quantities of dopants.

Original languageEnglish
Pages (from-to)624-629
Number of pages6
JournalIsrael Journal of Chemistry
Volume60
Issue number5-6
DOIs
StatePublished - 1 May 2020

Keywords

  • 2D Layered Materials
  • Colloidal Synthesis
  • Heterogenous Catalysis
  • Substitutional Doping

ASJC Scopus subject areas

  • Chemistry (all)

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