Aqueous ammonium ion storage utilizes the intercalation and coordination diffusion mechanisms of NH₄⁺ within the host material, resulting in a low-cost, high-safety energy storage device. However, the capacity of the NH₄⁺ storage hosts, represented by layered materials, is mainly limited by the limited interlayer size and coordination sites. Here, a strategy is proposed to enhance NH₄⁺ storage by utilizing nonmetallic ions with long-chain structures to regulate the interlayer spacing and coordination activity of MoS₂. Atomic-level electron microscopy, chemical reactions, and theoretical simulations revealed that SCN^– was successfully intercalated into MoS₂ 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 NH₄⁺ storage and demonstrates the broad prospects of interlayer coordination engineering strategies for energy storage devices.

中文翻译：

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硫氰酸盐配位调控二硫化钼的层间铵离子储存结构


水铵离子储存利用 NH₄⁺ 在主体材料内的插层和配位扩散机制，从而产生低成本、高安全性的储能装置。然而，以分层材料为代表的 NH₄⁺ 存储主机的容量主要受到有限的层间尺寸和协调站点的限制。本文提出了一种策略，通过利用具有长链结构的非金属离子来调节 MoS₂ 的层间距和配位活性，从而增强 NH₄⁺ 的储存。原子级电子显微镜、化学反应和理论模拟表明，SCN^– 成功嵌入 MoS₂ 并与 S 原子配位构建层间网络。SCN 的嵌入^– 提供足够的空间和丰富的氢键位点。这项工作有效解决了传统层状材料在 NH₄⁺ 存储中的困境，展示了储能器件层间协调工程策略的广阔前景。