Grishanova Polina, Prikhodchenko Petr V, Mikhaylov Alexey A, Medvedev Alexander G, Grishanov Dmitry, Lev Ovadia
The Casali Center of Applied Chemistry, The Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 9190401, Israel.
Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninskii prosp. 31, Moscow 119991, Russia.
J Colloid Interface Sci. 2025 Dec 15;700(Pt 1):138334. doi: 10.1016/j.jcis.2025.138334. Epub 2025 Jul 5.
We present a novel thin germanium sulfide-coated TiCT MXene electrode and evaluate its material properties and electrochemical (EC) performance as an anode for sodium-ion batteries (SIBs). The material was synthesized by depositing amorphous germanium sulfide onto TiCT MXenes via ammonium thiogermanate decomposition under low-pH conditions, with a nonionic surfactant added to prevent MXene flocculation and control particle size. Metal chalcogenide-MXene composites show great promise as SIB anodes, benefiting from MXenes' high electrical conductivity and the enhanced specific charge capacity provided by metal alloying and conversion reactions with sodium. However, MXene-based composite anodes for SIBs remain underexplored. The proposed germanium sulfide-TiCT composite anode demonstrates outstanding performance, achieving a specific charge capacity of 540 mAh·g after 100 cycles at 1 A·g, surpassing all previously reported metal chalcogenide-MXene anodes. Moreover, it exhibits excellent rate capability: a 30-fold increase in current density (from 0.1 to 3 A·g) results in less than 15 % capacity loss. At high current densities (>1 A·g), the GeS/MXene anode outperforms reduced graphene oxide (rGO)-supported GeS anodes synthesized via a similar protocol. These findings highlight the potential of MXene-supported GeS as a high-performance anode material for SIBs, paving the way for the development of next-generation MXene-based energy storage materials.
我们展示了一种新型的硫化锗包覆的TiCT MXene薄电极，并评估了其作为钠离子电池（SIBs）阳极的材料性能和电化学（EC）性能。该材料是通过在低pH条件下，经由硫代锗酸铵分解将非晶态硫化锗沉积到TiCT MXenes上合成的，添加了非离子表面活性剂以防止MXene絮凝并控制粒径。金属硫族化物-MXene复合材料作为SIBs阳极显示出巨大的潜力，这得益于MXenes的高电导率以及与钠的金属合金化和转化反应所提供的增强的比电荷容量。然而，用于SIBs的基于MXene的复合阳极仍未得到充分研究。所提出的硫化锗-TiCT复合阳极表现出出色的性能，在1 A·g下循环100次后比电荷容量达到540 mAh·g，超过了所有先前报道的金属硫族化物-MXene阳极。此外，它还表现出优异的倍率性能：电流密度增加30倍（从0.1到3 A·g）导致容量损失小于15%。在高电流密度（>1 A·g）下，GeS/MXene阳极优于通过类似方法合成的还原氧化石墨烯（rGO）负载的GeS阳极。这些发现突出了MXene负载的GeS作为SIBs高性能阳极材料的潜力，为下一代基于MXene的储能材料的开发铺平了道路。
