具有三维编织结构的Cu2Se@C薄膜作为增强Cu2+存储的阴极材料,Chinese Chemical Letters

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具有三维编织结构的Cu2Se@C薄膜作为增强Cu2+存储的阴极材料
Chinese Chemical Letters ( IF 9.4 ) Pub Date : 2023-06-18 , DOI: 10.1016/j.cclet.2023.108698
Wenhao Chen , Muxuan Wu , Han Chen , Lue Mo , Yirong Zhu

面对全球气候环境变化带来的多重挑战，发展清洁能源、更新绿色储能设备是实现碳达峰和碳中和的重要途径。水系电池由于具有使用多价电荷载体、高离子电导率、环境友好和成本效益等优点而成为研究热点。在这项工作中，首次通过简单的电化学沉积方法制备了具有三维编织结构的CuSe@C（CuSe涂覆在碳布上）薄膜用于Cu存储。与商用CuSe粉末相比，精心设计的CuSe@C薄膜表现出更高的比容量（0.5 A/g下为640 mAh/g）和倍率性能（5 A/g下为542 mAh/g）以及优异的循环稳定性（1 A/g 循环 1000 次后容量保持率为 82.7%）。 CuSe@C电极的Cu存储机制基于CuSe↔CuSe↔CuSe↔CuSe的可逆相变过程。在动力学特性分析中，由于相变和晶面间距的变化，CuSe@C电极在放电过程中表现出比充电过程更快的Cu扩散。这项工作突出了一种简便的一体式设计策略，并为探索先进的水储能系统开辟了新的途径。

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Cu2Se@C thin film with three-dimensional braided structure as a cathode material for enhanced Cu2+ storage

In the face of multiple challenges brought by the changes of global climate and environment, developing clean energy and updating green energy storage equipment are important ways to achieve carbon peak and carbon neutrality. Aqueous batteries have become a research hotspot due to their advantages of using the multivalent charge carrier, high ionic conductivity, environmental friendliness and cost effectiveness. In this work, the CuSe@C (CuSe coated on carbon clothes) thin film with a three-dimensional braided structure is fabricated by a simple electrochemical deposition method for Cu storage for the first time. Compared with the commercial CuSe powder, the well-designed CuSe@C film shows enhanced specific capacity (640 mAh/g at 0.5 A/g) and rate performance (542 mAh/g at 5 A/g) as well as superior cycling stability (82.7% capacity retention after 1000 cycles at 1 A/g). The Cu storage mechanism of the CuSe@C electrode is based on a reversible phase transition process of CuSe ↔ CuSe ↔ CuSe ↔ CuSe. In kinetic characteristic analysis, the CuSe@C electrode demonstrates faster Cu diffusion in discharge process than charge process resulting from the phase transition and the variation of interplanar spacing. This work highlights a facile one-piece design strategy and opens a new gateway for the exploration of advanced aqueous energy storage systems.

更新日期：2023-06-18

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