In-situ probing polarization-induced stability of single-atom alloy electrocatalysts in metal-air battery via synchrotron-based X-ray diffraction

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

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

In this work, a novel single-atom alloy electrocatalyst (SAAE) was developed for enhanced electrocatalysis in next-generation energy technologies. The catalyst, composed of single-atom Rh and bulk Ni on FeV3O8 support, overcomes challenges related to stability and efficiency in electrochemical reactions. The work function difference between Rh and Ni, as confirmed by computational and synchrotron-based analysis, facilitates superior electric polarization and ohmic contact with FeV3O8. The FeV3O8@RhNi demonstrates outstanding performance in oxygen reduction reactions (ORRs) and oxygen evolution reactions (OERs), with high half-wave potential (0.90 V) and low overpotential (120 mV at 10 mA cm−2). In zinc-air batteries, it maintains a stable discharge–charge voltage gap, specific capacity of 810 mAh g−1, peak power density of 186 mW cm−2 at 320 mA cm−2, and cycle stabilities exceeding 859 h at 10 mA cm−2. The catalyst also proves its durability in flexible zinc–air batteries, indicating its potential for efficient electrocatalytic reactions in emerging energy technologies.

Original languageEnglish
Article number124072
JournalApplied Catalysis B: Environmental
Volume353
DOIs
StatePublished - 15 Sep 2024

Keywords

  • Flexible metal-air battery
  • In-situ Raman spectra
  • In-situ synchrotron-based analysis
  • ORR/OER and HER
  • Reversible electrochemical reaction
  • Single-atom alloy electrocatalysts

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