MAX-phase Derived Tin Diselenide for 2D/2D Heterostructures with Ultralow Surface/Interface Transport Barriers toward Li-/Na-ions Storage,Small Methods

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MAX-phase Derived Tin Diselenide for 2D/2D Heterostructures with Ultralow Surface/Interface Transport Barriers toward Li-/Na-ions Storage
Small Methods ( IF 10.7 ) Pub Date : 2022-07-08 , DOI: 10.1002/smtd.202200658
Jun Mei _{1,

2} , Jing Shang _{3,

4} , Chao Zhang _{1,

2} , Dongchen Qi _{1,

2} , Liangzhi Kou _{1,

3} , Binodhya Wijerathne ₂ , Chunfeng Hu ₅ , Ting Liao _{1,

3} , Jennifer MacLeod _{1,

2} , Ziqi Sun _{1,

2}

Affiliation

2D tin diselenide and its derived 2D heterostructures have delivered promising potentials in various applications ranging from electronics to energy storage devices. The major challenges associated with large-scale fabrication of SnSe₂ crystals, however, have hindered its engineering applications. Herein, a tin-extraction synthetic method is proposed for producing large-size SnSe₂ bulk crystals. In a typical synthesis, a Sn-containing MAX phase (V₂SnC) and a Se source are heat-treated under a reducing atmosphere, by which Sn is extracted from the V₂SnC phase as a rectified Sn source to form SnSe₂ crystals in the cold zone. After the following liquid exfoliation, the obtained 2D SnSe₂ nanosheets have a lateral size of a few centimeters and an atomic thickness. Furthermore, by coupling with 2D graphene to form 2D/2D SnSe₂/graphene heterostructured electrodes, as validated by theoretical calculation and experimental studies, the superior Li-/Na-ion storage performance with ultralow surface/interface ion transport barriers are achieved for rechargeable Li-/Na-ion batteries. This innovative synthetic strategy opens a new avenue for the large-scale synthesis of selenides and offers more options into the practical application of emerging 2D/2D heterostructure for electrochemical energy storage.

中文翻译：

用于 2D/2D 异质结构的 MAX 相衍生二硒化锡，具有超低表面/界面传输势垒，可用于存储锂/钠离子

2D 二硒化锡及其衍生的 2D 异质结构在从电子产品到储能设备的各种应用中具有广阔的应用前景。然而，与大规模制造 SnSe ₂晶体相关的主要挑战阻碍了其工程应用。_{在此，提出了一种用于生产大尺寸SnSe 2}块状晶体的锡提取合成方法。在典型的合成中，含Sn的MAX相(V ₂ SnC)和Se源在还原气氛下进行热处理，由此从V ₂ SnC相中提取Sn作为整流的Sn源以形成SnSe ₂晶体在寒冷地带。经过下面的液体剥离，得到的 2D SnSe ₂纳米片具有几厘米的横向尺寸和原子厚度。此外，通过与2D石墨烯耦合形成2D/2D SnSe ₂ /石墨烯异质结构电极，经理论计算和实验研究验证，可充电实现了具有超低表面/界面离子传输势垒的优异锂/钠离子存储性能。锂/钠离子电池。这种创新的合成策略为硒化物的大规模合成开辟了一条新途径，并为新兴的二维/二维异质结构在电化学储能中的实际应用提供了更多选择。

更新日期：2022-07-08

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