期刊
NANO ENERGY
卷 91, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2021.106663
关键词
Electrochemical electrode; Manganese oxide; Silver/silver oxide; Carbon; Thermochemical synthesis
类别
资金
- National Research Foundation of Korea (NRF) - Korea government (Ministry of Science and ICT) [2019R1A2C2085583, 2020R1A5A1018153]
- National Research Foundation of Korea [2019R1A2C2085583] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This study presents a new synthesis technique - ultrafast extreme thermal-electrical wave (UTEW), for preparing unconventional arranged and morphology trapped composite electrodes. The technology allows for the fabrication of unique volcano-shaped core-shell silver-manganese oxide branches anchored on carbon fibers, showing excellent performance in electrochemical applications.
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-shapelike 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.
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