Hybridized heterostructure of CoS and MoS2 nanoparticles for highly-efficient and robust bifunctional water electrolysis

Abu Talha Aqueel Ahmed, Chi Ho Lee, Abu Saad Ansari, S. M. Pawar, Jonghoon Han, Sunjung Park, Giho Shin, Seungun Yeon, Sangeun Cho, Jaehun Seol, Sang Uck Lee, Hyungsang Kim, Hyunsik Im

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

For industrial hydrogen production, it is beneficial to develop highly-efficient, earth-abundant, and bifunctional electrocatalysts which exhibit compatibility between oxygen evolution reaction (OER) or hydrogen evolution reaction (HER) activity and stability in the same electrolyte. Herein, we report a bifunctional hybrid CoS/MoS2 nanoparticle electrocatalyst in 1 M KOH, fulfilling desirable industrial criteria for water electrolysis. The CoS/MoS2 catalyst exhibits excellent OER and HER activities with very low overpotentials as well as outstanding stability for more than 100 h, even at a high current density of 250 mA cm−2. The bifunctional CoS/MoS2 catalyst-based water-electrolyzer exhibits a low cell voltage of 1.52 V at 10 mA cm−2 (1.714 V at 100 mA cm−2) with long–term stability. Density functional theory calculations reveal that the hybrid CoS/MoS2 electrocatalyst shows one–way electron transfer that can activate both oxidative/reductive reactions. Therefore, it exhibits superior OER and HER activities, outperforming the state-of-the-art noble-metal-free catalysts.

Original languageEnglish
Article number153196
JournalApplied Surface Science
Volume592
DOIs
StatePublished - 1 Aug 2022

Keywords

  • Bifunctional activity
  • CoS/MoS nanoparticle heterostructure
  • Density functional theory
  • Electrocatalyst
  • Hydrothermal growth

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