Heterostructured NiMo-sulfide micro-pillar arrays for advanced alkaline electrocatalytic clean hydrogen production via overall water splitting

Sarfraj H. Mujawar, Amol S. Salunke, Ramesh J. Deokate, Shrikrishna T. Salunke, Nabeen K. Shrestha, Hyunsik Im, Akbar I. Inamdar

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Transition metals doped molybdenum sulfide/oxide present themselves as capable for hydrogen evolution reaction (HER), because of their exceptional chemical and physical properties. In this study, we introduce a strategy for synthesizing molybdenum-based binary sulfide/oxide heterostructures using a hydrothermal method. An electrochemical investigation revealed the pivotal role of NiMo-sulfide in achieving remarkable bifunctional electrocatalytic activity, resulting in a current density of −50 mA cm−2 at an overpotential of 174 mV for HER. The excellent reaction kinetics were evident from the low Tafel slope of 116.8 mVdec−1. The electrolyzer showcased outstanding performance, with the best-performing NiMo-sulfide and benchmark RuO2 at the anode. It achieved a low cell potential of 1.60 V to reach 10 mA cm−2, exhibited remarkable durability for 100 h, and demonstrated promise for water splitting with a Faradaic efficiency of 94 and 89 % for O2 and H2 evolution respectively. Furthermore, the electrolyzer displayed potential for large-scale hydrogen production by attaining an industrially appropriate current density of 800 mA cm−2 at a cell potential of 2.24 V. This study also highlights the latest advancements in electrodialysis to enhance the catalytic activity of electrode materials.

Original languageEnglish
Article number160081
JournalApplied Surface Science
Volume661
DOIs
StatePublished - 15 Jul 2024

Keywords

  • Electrocatalysis
  • Green hydrogen generation
  • Hydrogen evolution reaction
  • Overall water splitting

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