当前位置: X-MOL 学术Int. J. Energy Res. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
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
down
wechat
bug