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<p>Green, scalable and efficient synthesis methods are critical for advancing MXene research and practical applications. However, the production of delaminated MXenes still relies on complex multistep processes to achieve both selective etching and delamination. Here we propose a single-step strategy to directly transform MAX phases into delaminated MXenes using a deep eutectic solvent (DES) based on cobalt chloride/choline chloride (CoCl<sub>2</sub>·6H<sub>2</sub>O/ChCl). This system combines a redox process between Lewis acidic salts and A-site elements with an expansion effect from organic ligand decomposition, enabling integrated etching, delamination and surface functionalization. The DES-derived MXenes exhibit unique surface chemistry with –Cl, –O and –NH<sub><i>y</i></sub>R<sub>1−<i>y</i></sub> terminations, delivering exceptional lithium-ion storage performance (451 mAh g<sup>−1</sup> at 0.05 A g<sup>−1</sup>). Notably, this approach yields MXenes with positively charged surfaces, suppressing anionic polyiodide shuttling in zinc–iodine batteries. The resulting batteries retain 146 mAh g<sup>−1</sup> capacity after over 60,000 cycles at 10 A g<sup>−1</sup>. This work provides an environmentally friendly and scalable route to delaminated MXenes, integrating structural control with interfacial engineering, and expands their versatility in energy storage and beyond.</p><p></p>

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Single-step synthesis of delaminated MXenes in deep eutectic solvents

  • 期刊论文

  • 发表日期：

    2026年3月11日

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  • Fangbing Li,
  • Yu Long,
  • Zhitan Wu,
  • Ruiqing Ye,
  • Zhiguo Li,
  • Boya Zhang,
  • Jinyang Yu,
  • Feifei Wang,
  • Zihui Chen,
  • Chuannan Geng,
  • Sijia Chi,
  • Li Wang,
  • Zifeng Lin,
  • Patrice Simon,
  • Ying Tao,
  • Quan-Hong Yang

摘要

Green, scalable and efficient synthesis methods are critical for advancing MXene research and practical applications. However, the production of delaminated MXenes still relies on complex multistep processes to achieve both selective etching and delamination. Here we propose a single-step strategy to directly transform MAX phases into delaminated MXenes using a deep eutectic solvent (DES) based on cobalt chloride/choline chloride (CoCl2·6H2O/ChCl). This system combines a redox process between Lewis acidic salts and A-site elements with an expansion effect from organic ligand decomposition, enabling integrated etching, delamination and surface functionalization. The DES-derived MXenes exhibit unique surface chemistry with –Cl, –O and –NHyR1−y terminations, delivering exceptional lithium-ion storage performance (451 mAh g−1 at 0.05 A g−1). Notably, this approach yields MXenes with positively charged surfaces, suppressing anionic polyiodide shuttling in zinc–iodine batteries. The resulting batteries retain 146 mAh g−1 capacity after over 60,000 cycles at 10 A g−1. This work provides an environmentally friendly and scalable route to delaminated MXenes, integrating structural control with interfacial engineering, and expands their versatility in energy storage and beyond.