Expeditious Electrochemical Synthesis of Mesoporous Chalcogenide Flakes: Mesoporous Cu2Se as a Potential High-Rate Anode for Sodium-Ion Battery,Small

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Expeditious Electrochemical Synthesis of Mesoporous Chalcogenide Flakes: Mesoporous Cu2Se as a Potential High-Rate Anode for Sodium-Ion Battery
Small ( IF 13.0 ) Pub Date : 2022-07-29 , DOI: 10.1002/smll.202106629
Tomota Nagaura ₁ , Jinliang Li ₂ , Joseph F S Fernando ₃ , Aditya Ashok ₁ , Azhar Alowasheeir ₄ , Ashok Kumar Nanjundan ₅ , Sukho Lee ₆ , Dmitri V Golberg ₃ , Jongbeom Na _{1,

6} , Yusuke Yamauchi _{1,

4,

5}

Affiliation

Nanostructured copper selenide (Cu₂Se) attracts much interest as it shows outstanding performance as thermoelectric, photo-thermal, and optical material. The mesoporous structure is also a promising morphology to obtain better performance for electrochemical and catalytic applications, thanks to its high surface area. A simple one-step electrochemical method is proposed for mesoporous chalcogenides synthesis. The synthesized Cu₂Se material has two types of mesopores (9 and 18 nm in diameter), which are uniformly distributed inside the flakes. These materials are also implemented for sodium (Na) ion battery (NIB) anode as a proof of concept. The electrode employing the mesoporous Cu₂Se exhibits superior and more stable specific capacity as a NIB anode compared to the non-porous samples. The electrode also exhibits excellent rate tolerance at each current density, from 100 to 1000 mA g⁻¹. It is suggested that the mesoporous structure is advantageous for the insertion of Na ions inside the flakes. Electrochemical analysis indicates that the mesoporous electrode possesses more prominent diffusion-controlled kinetics during the sodiation–desodiation process, which contributes to the improvement of Na-ion storage performance.

中文翻译：

介孔硫属化物薄片的快速电化学合成：介孔 Cu2Se 作为钠离子电池的潜在高倍率阳极

纳米结构的硒化铜 (Cu ₂ Se) 因其作为热电、光热和光学材料的出色性能而备受关注。由于其高表面积，介孔结构也是一种很有前途的形态，可以在电化学和催化应用中获得更好的性能。提出了一种简单的一步电化学方法用于介孔硫属化物的合成。合成的 Cu ₂ Se 材料具有两种类型的中孔（直径 9 和 18 nm），它们均匀分布在薄片内部。这些材料也用于钠 (Na) 离子电池 (NIB) 阳极，作为概念验证。采用介孔Cu _2的电极与无孔样品相比，硒作为 NIB 阳极表现出优异且更稳定的比容量。^{该电极还在从100到1000 mA g -1}的每个电流密度下表现出优异的速率耐受性。表明介孔结构有利于钠离子插入薄片内。电化学分析表明，介孔电极在钠化-脱钠过程中具有更突出的扩散控制动力学，有助于提高钠离子的存储性能。

更新日期：2022-07-29

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