Charge state modulation in metal-organic framework-based porous cobalt-incorporated nickel sulfide for efficient hydrogen evolution in anion exchange membrane water electrolyzer

Hyeonggeun Choi, Seunghwan Jo, Hee Young Lim, Young Woo Lee, Jung Inn Sohn

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

For practical water electrolysis-based hydrogen production, the development of efficient electrocatalysts based on earth-abundant materials is highly desirable. Herein, metal-organic framework (MOF) derived Co-incorporated nickel sulfide (MD-Co/NiS2) is demonstrated as a promising hydrogen evolution reaction (HER) electrocatalyst in an anion exchange membrane water electrolyzer (AEMWE). The MD-Co/NiS2 exhibits a porous structure packed with numerous nanoparticles while maintaining the primary spherical morphology of the MOF, resulting in a large surface area with enhanced porosity. Furthermore, the reaction kinetics is enhanced by alleviating the charge polarization of Ni and S after Co incorporation. Owing to the integrated benefits of the geometrical and chemical structures, MD-Co/NiS2 requires a low overpotential of 117 mV with long-term stability for 50 h at a current density of 10 mA cm−2 in 1 M KOH. Moreover, AEMWE using MD-Co/NiS2 as a cathode catalyst requires a low cell voltage of 1.97 V at a high current density of 1 A cm−2, comparable to that of commercial Pt/C (2.01 V) and maintains cell performance for 50 h with a small potential increase of 55 mV.

Original languageEnglish
Article number103987
JournalSurfaces and Interfaces
Volume46
DOIs
StatePublished - Mar 2024

Keywords

  • Anion exchange membrane water electrolyzer
  • Charge delocalization
  • Hydrogen evolution reaction
  • Metal-organic framework
  • Transition metal chalcogenides

Fingerprint

Dive into the research topics of 'Charge state modulation in metal-organic framework-based porous cobalt-incorporated nickel sulfide for efficient hydrogen evolution in anion exchange membrane water electrolyzer'. Together they form a unique fingerprint.

Cite this