N-doped carbon-coated CoSe2 nanocrystals anchored on two-dimensional MXene nanosheets for efficient electrochemical sodium- and potassium-ion storage,International Journal of Energy Research

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N-doped carbon-coated CoSe2 nanocrystals anchored on two-dimensional MXene nanosheets for efficient electrochemical sodium- and potassium-ion storage
International Journal of Energy Research ( IF 4.3 ) Pub Date : 2021-07-01 , DOI: 10.1002/er.7004
Hong Geun Oh ₁ , Su Hyun Yang ₂ , Yun Chan Kang ₂ , Seung‐Keun Park ₁

Affiliation

Sodium-ion batteries (SIBs) and potassium-ion batteries (KIBs) have received much attention as next-generation energy storage systems owing to the abundance. Nevertheless, they face great challenges in the design of optimum electrode materials for practical applications. Herein, we prepared a unique two-dimensional structured composite consisting of N-doped carbon-coated CoSe₂ nanocrystals and MXene nanosheets (CoSe₂@NC/MX) for efficient electrochemical Na- and K-ion storage. In this strategy, a Co-based zeolitic imidazole framework (ZIF-67) was deposited on the surface of MXene nanosheets, and the subsequent selenization process resulted in the transformation of the ZIF-67 into CoSe₂@NCs. The unique structure can shorten the transport pathways for electrons/ions and provide sufficient space to accommodate the volume change of the active materials. Furthermore, the N-doped carbon matrix and MXene can enhance the robustness of the electrode materials. Accordingly, the composites exhibited enhanced electrochemical performance in terms of cycle stability (317 mA h g⁻¹ after 200 cycles at 0.5 A g⁻¹) and rate capability (343 mA h g⁻¹ at 7.0 A g⁻¹) for SIBs. For KIBs, they exhibited a high reversible capacity of 358 mA h g⁻¹ at 0.5 A g⁻¹ after 100 cycles and 276 mA h g⁻¹ at a high rate of 2.0 A g⁻¹.

中文翻译：

锚定在二维 MXene 纳米片上的 N 掺杂碳包覆 CoSe2 纳米晶体用于高效电化学钠离子和钾离子存储

钠离子电池（SIBs）和钾离子电池（KIBs）由于储量丰富，作为下一代储能系统备受关注。然而，他们在为实际应用设计最佳电极材料方面面临着巨大挑战。在此，我们制备了一种独特的二维结构复合材料，该复合材料由 N 掺杂的碳涂层 CoSe ₂纳米晶体和 MXene 纳米片 (CoSe ₂ @NC/MX) 组成，用于高效的电化学钠离子和钾离子存储。在该策略中，钴基沸石咪唑骨架（ZIF-67）沉积在 MXene 纳米片的表面，随后的硒化过程导致 ZIF-67 转化为 CoSe ₂@NC。独特的结构可以缩短电子/离子的传输路径，并提供足够的空间来适应活性材料的体积变化。此外，N 掺杂的碳基体和 MXene 可以增强电极材料的稳健性。在循环稳定性方面相应地，复合材料表现出增强的电化学性能（317毫安ħ克^-1 0.5 A G 200次循环后^-1）和倍率性能（343毫安ħ克^-1 7.0 A G ^-1）为的SIB。对于KIBS，它们表现出的358毫安ħg的高可逆容量^-1在0.5 A克^-1后100次循环和276毫安ħ克^-1在2.0 A g的高速率^-1。

更新日期：2021-09-09

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