High-performance rechargeable metal–air batteries enabled by efficient charge transport in multielement random alloy electrocatalyst

Chandran Balamurugan, Changhoon Lee, Kyusang Cho, Jehan Kim, Byoungwook Park, Woochul Kim, Namsoo Lim, Hyeonghun Kim, Yusin Pak, Keun Hwa Chae, Ji Hoon Shim, Sooncheol Kwon

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

The integration of bifunctionally active sites of multielement random alloy catalysts with other metal oxide electrocatalysts is a promising strategy for efficient electrochemical reactions. In this study, a novel combination of virtual crystal approximation and hydrothermal synthesis was used to investigate the composition-dependent structure and electrical property in a Ag1−xNix catalyst. The combination showed that a hexagonal closed-packed structure of Ag1−xNix with a compositional ratio of 6:4 (Ag:Ni) had electrical conductivity of ∼2 × 107 S∙cm−1 and an ionization potential of − 5.4 eV. Furthermore, the bifunctional oxygen electrocatalytic efficiencies of Ag0.6Ni0.4 were improved by forming a heterointerface with the CoNb2O6 electrocatalyst, resulting in a discharge-charge voltage gap of 0.81 V over 587 h, peak power density of 178.9 mW∙cm−2, and specific capacity of 806.8 mA∙h∙g−1 in a zinc–air battery. This approach was applied to pouch-type zinc–air batteries, resulting in long-term stability of over 158.6 h at 10 mA∙cm−2.

Original languageEnglish
Article number122631
JournalApplied Catalysis B: Environmental
Volume330
DOIs
StatePublished - 5 Aug 2023

Keywords

  • Electrocatalyst
  • Energy storage
  • Multielement random alloy catalyst
  • Oxygen electrolysis
  • Rechargeable metal-air pouch cell
  • Virtual crystal approximation

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