The adjustable structures and remarkable physicochemical properties of 2D monoelemental materials, such as silicene and germanene, have attracted significant attention in recent years. They can be transformed into silicane (SiH) and germanane (GeH) through covalent functionalization via hydrogen atom termination. However, synthesizing these materials with a scalable and low-cost fabrication process to achieve high-quality 2D SiH and GeH poses challenges. Herein, groundbreaking 2D SiH and GeH materials with varying compositions, specifically Si0.25Ge0.75H, Si0.50Ge0.50H, and Si0.75Ge0.25H, are prepared through a simple and efficient chemical exfoliation of their Zintl phases. These 2D materials offer significant advantages, including their large surface area, high mechanical flexibility, rapid electron mobility, and defect-rich loose-layered structures. Among these compositions, the Si0.50Ge0.50H electrode demonstrates the highest discharge capacity, reaching up to 1059 mAh g-1 after 60 cycles at a current density of 75 mA g-1. A comprehensive ex-situ electrochemical analysis is conducted to investigate the reaction mechanisms of lithiation/delithiation in Si0.50Ge0.50H. Subsequently, an initial assessment of the c-Li15(SixGe1- x)4 phase after lithiation and the a-Si0.50Ge0.50 phase after delithiation is presented. Hence, this study contributes crucial insights into the (de)lithiation reaction mechanisms within germanane-silicane alloys. Such understanding is pivotal for mastering promising materials that amalgamate the finest properties of silicon and germanium.

Department of Engineering Faculty of Environment Science and Economy University of Exeter Exeter EX4 4PY United Kingdom

Department of Inorganic Chemistry University of Chemistry and Technology Prague Technická 5 Prague 6 16628 Czech Republic

Department of Physical Chemistry University of Chemistry and Technology Prague Technická 5 Prague 6 16628 Czech Republic

Institute of Micro Nano Materials and Devices Ningbo University of Technology Ningbo 315211 China

School of Materials Science and Engineering Xiangtan University Xiangtan 411105 China

School of Physics Xi'an Jiaotong University Xi'an 710049 China

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Revitalizing Micro-Sized Si-Based Anodes Through Advanced Structural Design and Interface Stabilization: A Review