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

Chandran BalamuruganChanghoon LeeKyusang ChoJehan KimByoungwook ParkYusin PakJaemin KongSooncheol Kwon
Published in: Advanced science (Weinheim, Baden-Wurttemberg, Germany) (2022)
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 (NiV 2 O 6 ), allows an enlarged surface area and efficient charge transfer/redistribution, resulting in a bifunctional OER/ORR superior to those of conventional Pt/C or RuO 2 . The dual-phase NiV 2 O 6 /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 NiV 2 O 6 /AgMn catalysts are successfully applied as pouch-type zinc-air batteries with long-term stability over 33.9 h at 10 mA cm -2 .
Keyphrases
  • highly efficient
  • solid state
  • oxide nanoparticles
  • life cycle
  • metal organic framework
  • gold nanoparticles
  • electron transfer