NiCoS/carbon black based bifunctional air electrode for Zn-air secondary batteries

Nuttasith Tangaemsakul, Arunachala Kannan, Nisit Tantavichet

Research output: Contribution to journalArticlepeer-review

Abstract

Nickel cobalt sulfide bifunctional catalysts were synthesized on a carbon black (CB) catalyst support through hydrothermal and solvothermal methods for the oxygen reduction (ORR) and evolution reactions (OER) in secondary rechargeable Zn-air batteries. It was found that NiCo2S4/CB was more suitable to be synthesized using ethylene glycol as the dispersing agent than water, and had better ORR/OER catalytic activities than the NiCoS composites with other Ni/Co ratios. In particular, NiCo2S4 showed significantly enhanced electrocatalytic activities when incorporated with CB to form NiCo2S4/CB, with superior ORR/OER electrocatalytic activities compared to NiCo2O4/CB. Even though, the ORR electrocatalytic activity was lower compared to Pt/C, NiCo2S4/CB showed a significantly superior OER activity (~ 0.75 V @ 10 mA cm−2), demonstrating better overall bifunctional characteristics towards the ORR and OER. The NiCo2S4/CB based bifunctional air electrode in a Zn-air single cell exhibited a higher stability (≤1.0 V charge/discharge plateau separation for 400 cycles) and longer cycle life (>500 cycles) than Pt/C (~ 250 cycles), and so has potential commercial viability.

Original languageEnglish (US)
Article number159749
JournalJournal of Alloys and Compounds
Volume873
DOIs
StatePublished - Aug 25 2021

Keywords

  • Nickel cobalt sulfide
  • Oxygen evolution
  • Oxygen reduction
  • Secondary Zn-air cell

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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