Morphology controlled synthesis of 2-d Ni–Ni3S2 and ni3s2 nanostructures on ni foam towards oxygen evolution reaction

Nitin Kaduba Chaudhari, Aram Oh, Young Jin Sa, Haneul Jin, Hionsuck Baik, Sang Gu Kim, Suk Joong Lee, Sang Hoon Joo, Kwangyeol Lee

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

Catalysts for oxygen evolution reactions (OER) are at the heart of key renewable energy technologies, and development of non-precious metal catalysts with high activity and stability remain a great challenge in this field. Among various material candidates, metal sulfides are receiving increasing attention. While morphology-dependent catalytic performances are well established in noble metal-based catalysts, relatively little is known for the morphology‒cata-lytic performance relationship in metal sulfide catalysts. In this study, uniform spider web-like Ni nanosheets–Ni3S2 and honeycomb-like Ni3S2 structures are deposited on nickel foam (Ni3S2/NF) by a facile one-step hydrothermal synthetic route. When used as an oxygen evolution electrode, the spider web-like Ni–Ni3S2/NF with the large exposed surface area shown excellent catalytic activity and stability with an overpotential of ~310 mV to achieve at 10 mA/ cm2 and a Tafel slope of 63 mV/dec in alkaline media, which is superior to the honeycomb-like structure without Ni nanosheet. The low Tafel slope of the spider web-like Ni–Ni3S2/NF represents one of the best OER kinetics among nickel sulfide-based OER catalysts. The results point to the fact that performance of the metal sulfide electrocatalysts might be fine-tuned and optimized with morphological controls.

Original languageEnglish
Article number7
JournalNano Convergence
Volume4
Issue number1
DOIs
Publication statusPublished - 2017 Dec

Keywords

  • Nickel foam
  • Nickel nanosheets
  • Nickel sulphide
  • OER
  • Tafel slope

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)

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