Hydrothermally Grown Dual-Phase Heterogeneous Electrocatalysts for Highly Efficient Rechargeable Metal-Air Batteries with Long-Term Stability

Chandran Balamurugan, Changhoon Lee, Kyusang Cho, Jehan Kim, Byoungwook Park, Yusin Pak, Jaemin Kong, Sooncheol Kwon

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Metal-air batteries as alternatives to the existing lithium-ion battery are becoming increasingly attractive sources of power due to their high energy-cost competitiveness and inherent safety; however, their low oxygen evolution and reduction reaction (OER/ORR) performance and poor operational stability must be overcome prior to commercialization. Herein, it is demonstrated that a novel class of hydrothermally grown dual-phase heterogeneous electrocatalysts, in which silver-manganese (AgMn) heterometal nanoparticles are anchored on top of 2D nanosheet-like nickel vanadium oxide (NiV2O6), allows an enlarged surface area and efficient charge transfer/redistribution, resulting in a bifunctional OER/ORR superior to those of conventional Pt/C or RuO2. The dual-phase NiV2O6/AgMn catalysts on the air cathode of a zinc-air battery lead to a stable discharge–charge voltage gap of 0.83 V at 50 mA cm−2, with a specific capacity of 660 mAh g−1 and life cycle stabilities of more than 146 h at 10 mA cm−2 and 11 h at 50 mA cm−2. The proposed new class of dual-phase NiV2O6/AgMn catalysts are successfully applied as pouch-type zinc-air batteries with long-term stability over 33.9 h at 10 mA cm−2.

Original languageEnglish
Article number2203663
JournalAdvanced Science
Volume9
Issue number32
DOIs
StatePublished - 14 Nov 2022

Keywords

  • AgMn
  • dual-phase electrocatalysts
  • nickel vanadium oxide (NiVO)
  • sequential hydrothermal reaction
  • Zn-air batteries

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