Thiocyanate Coordination Regulates the Interlayer Ammonium Ion Storage Structure of Molybdenum Disulfide
Hang Li, Ruohan Yu, Haibo Chen, Jing Hu, Jianli Zhang, Guangya Hou, Qiang Chen, Jun Lü, Yiping Tang
Abstract
Aqueous ammonium ion storage utilizes the intercalation and coordination diffusion mechanisms of NH 4 + within the host material, resulting in a low-cost, high-safety energy storage device. However, the capacity of the NH 4 + storage hosts, represented by layered materials, is mainly limited by the limited interlayer size and coordination sites. Here, a strategy is proposed to enhance NH 4 + storage by utilizing nonmetallic ions with long-chain structures to regulate the interlayer spacing and coordination activity of MoS 2 . Atomic-level electron microscopy, chemical reactions, and theoretical simulations revealed that SCN – was successfully intercalated into MoS 2 and coordinated with S atoms to construct an interlayer network. The intercalation of SCN – provides sufficient space and abundant hydrogen-bonding sites. This work effectively solves the dilemma of traditional layered materials in NH 4 + storage and demonstrates the broad prospects of interlayer coordination engineering strategies for energy storage devices.