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Potassium-stabilized metastable carbides and chalcogenides via surface chemical potential modulation

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  • Fanpeng Chen

    (Tianjin University)

  • Chuanqi Cheng

    (Tianjin University)

  • Jiajun Wang

    (Tianjin University)

  • Yanran Han

    (Tianjin University)

  • Bo-Hang Zhao

    (Tianjin University)

  • Bin Zhang

    (Tianjin University)

Abstract

Metastable carbides and chalcogenides are attractive candidates for wide and promising applications. However, their inherent instability leads to synthetic difficulty and poor durability. Thus, the development of facile strategies for the controllable synthesis and stabilization of metastable carbides is still a great challenge. Here, taking metastable ɛ-Fe2C as a case study, potassium ions (K+) are theoretically predicted and experimentally reported to control the synthesis of metastable ɛ-Fe2C from an Fe2N precursor by increasing the surface carbon chemical potential (μC). The controllable synthesis and improved stability are attributed to the better-matched denitriding and carburizing rates and the impeded spillover of carbon atoms in metastable ɛ-Fe2C with high carbon contents due to the enhanced surface μC. In addition, this strategy is suitable for synthesizing metastable γ’-MoC, MoN, 1T-MoS2, 1T-MoSe2, 1T-MoSe2xTe2(1−x), and 1T-Mo1−xWxSe2, highlighting the universality of the methodology. Impressively, gram-level scalable metastable ɛ-Fe2C remains stable for more than 398 days in air. Furthermore, ɛ-Fe2C exhibits remarkable olefin selectivity and durability for more than 36 h of continuous testing. This work not only demonstrates a facile, easily scalable, and general strategy for accessing various metastable carbides and chalcogenides but also addresses the synthetic difficulty and poor durability challenge of metastable materials.

Suggested Citation

  • Fanpeng Chen & Chuanqi Cheng & Jiajun Wang & Yanran Han & Bo-Hang Zhao & Bin Zhang, 2025. "Potassium-stabilized metastable carbides and chalcogenides via surface chemical potential modulation," Nature Communications, Nature, vol. 16(1), pages 1-11, December.
  • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-59124-3
    DOI: 10.1038/s41467-025-59124-3
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    References listed on IDEAS

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