High-performance oxygen electrocatalysts have attracted tremendous research attention because of their crucial roles in diverse renewable energy technologies such as metal-oxygen batteries, fuel cells, and water electrolyzers. In this study, a novel lattice manipulation strategy for the exploration of highly active electrocatalysts was established via self-assembly between exfoliated MXene and layered double hydroxide (LDH) nanosheets (NSs). Electrostatically-driven self-assembly between cationic Co-Fe-LDH and anionic MXene NSs yielded intimately-coupled Co-Fe-LDH-MXene nanohybrids with porous stacking structures and significant interfacial charge transfer. The self-assembled Co-Fe-LDH-MXene nanohybrid delivered excellent electrocatalyst functionality with a lowered overpotential of 252 mV at 10 mA cm−2 that is much better than those of the precursor Co-Fe-LDH and MXene NSs. The outstanding electrocatalytic activity of the self-assembled Co-Fe-LDH-MXene nanohybrid highlights a high efficacy of the self-assembly methodology in exploring high-performance electrocatalysts. In situ surface enhanced Raman scattering analysis during electrocatalysis found that the enhanced redox activity of metal cations achieved by intimate electronic coupling with ultrathin conductive MXene NSs mainly contributes to the improved performance of the Co-Fe-LDH-MXene nanohybrids for oxygen evolution reaction.
|Publication status||Published - 2022 Oct|
Bibliographical noteFunding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (Nos. NRF-2020R1A2C3008671 and NRF-2017R1A5A1015365). This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2022R1I1A1A01073032). The research was supported by the Yonsei University Grab Grant of 2021-22-0304 and Yonsei Signature Research Cluster Program of 2021 (2021-22-0002).
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All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering