Silverene: An Atomically Thin Metallene with Superior Quantum Capacitance

Two-dimensional nonmetallenes, including graphene, phosphorene, silicene, and borophene, have attracted considerable attention in multiple scientific fields due to their remarkable and unique characteristics. Since the successful synthesis of molybdenene and goldene, 2D metallenes have shown great promise for various applications. In this work, we employ density function theory (DFT) calculations and ab initio molecular dynamics (AIMD) simulations to predict the silverene, aiming at achieving the possible stable structure of silverene and calculating its corresponding physical properties. Using RG2 software, we predict 9 possible silverene structures. Following, their energetic, dynamical, mechanical, and thermodynamic stability are systematically examined and only one silverene structure shows complete stability. Furthermore, we also test its mechanical and electronic properties. Additionally, we have computed the quantum capacitance and surface storage charge of this material, which are superior to many 2D materials and can be characterized as potential electrodes in supercapacitors and high-energy storage devices. Our findings not only explore the possible existence and configuration of silverene as a stable two-dimensional metallene but also pave the way for future application of such metallene.