Ultrafast extreme thermal–electrical fabrication of volcano-shape-like core-shell Ag-MnxOy branches anchored on carbon as high-performance electrochemical electrodes

Taehan Yeo, Byungseok Seo, Jaeho Lee, Seounghyun Park, Kyungmin Kim, Wonjoon Choi

Research output: Contribution to journalArticlepeer-review

Abstract

Rationally designed hybrids of metal/metal oxides/carbon-based materials can overcome the fundamental limits of single-material electrodes. However, their conventional synthesis causes phase/interface segregation/unintended diffusive characteristics of building blocks. Herein, we report an ultrafast extreme thermal-electrical wave (UTEW) which is a Joule heating-driven, tunable and scalable synthesis technique for unusually arranged and morphologically trapped Ag-MnxOy-carbon fiber (CF) electrochemical electrodes. UTEW induces thermochemical reactions passing through entire precursor mixtures of silver-manganese nitrates and CF within a few seconds. The programmable temperature ranges and heating–cooling rates/duration enable morphological traps capturing metastable phases and wetted interfaces of the constituents, thereby fabricating unique volcano-shape-like core-shell Ag-MnxOy branches anchored on CF (VCS-Ag-MnxOy-CF). The comparison with other electrodes (Ag-CF and MnxOy-CF) elucidate the formation mechanism of VCS-Ag-MnxOy-CF and the synergistic effects of rationally combined Ag-MnxOy-CF in electrochemical performances. The UTEW fabrication strategy will inspire fascinating hybrid electrodes and catalysts which cannot be achieved through conventional fabrication methods.

Original languageEnglish
Article number106663
JournalNano Energy
Volume91
DOIs
Publication statusPublished - 2022 Jan

Keywords

  • Carbon
  • Electrochemical electrode
  • Manganese oxide
  • Silver/silver oxide
  • Thermochemical synthesis

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)
  • Electrical and Electronic Engineering

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