用于储能的异质结构金属 1T-VSe2/Ti3C2Tx MXene 纳米片,ACS Applied Nano Materials

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用于储能的异质结构金属 1T-VSe2/Ti3C2Tx MXene 纳米片
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2022-02-28 , DOI: 10.1021/acsanm.2c00533
Sree Raj KA ₁ , Pratap Mane ₂ , Sithara Radhakrishnan ₁ , Brahmananda Chakraborty _{3,

4} , Chandra Sekhar Rout ₁

Affiliation

基于 MXene 的混合材料已广泛用于超级电容器和储能应用。在这项工作中，我们在 MXene 片材上生长了金属 VSe ₂层状材料，以实现增强的储能性能。VSe ₂ /MXene异质结构显示出改进的储能性能，在1 A/g的比电流下，比电容为144 F/g，在双电极对称配置中经过5000次充放电循环后的循环寿命为92.8%。此外，我们提出了广泛的密度泛函理论模拟来研究 VSe ₂及其杂化 VSe _{2的键合相互作用和电子特性}/MXene。_{如实验观察所示，混合 VSe 2} /MXene 在费米能级附近的增强态、优越的量子电容和比 VSe 2 更低的扩散势垒_支持改进的电荷存储和混合的更好的电容行为。VSe ₂和MXene 之间的相互作用是由于电子电荷从MXene 的Ti 3d 轨道转移到VSe ₂的V 3d 轨道，以及弱范德华力。_{还构建了不对称超级电容器以利用 VSe 2} /MXene 电极的高储能性能。此外，VSe ₂ /MXene//MoS ₂/MWCNT 不对称电极组件在 2316 W/kg 的功率密度下提供 42 Wh/kg 的能量密度，在 5000 次充放电循环后电容保持率为 90%。

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Heterostructured Metallic 1T-VSe2/Ti3C2Tx MXene Nanosheets for Energy Storage

MXene-based hybrid materials have been expedited extensively for supercapacitors and energy storage applications. In this work, we have grown the metallic VSe₂ layered material on MXene sheets to achieve enhanced energy storage performance. The VSe₂/MXene heterostructures showed improved energy storage performance with a specific capacitance of 144 F/g at a specific current of 1 A/g and a cycling life of 92.8% after 5000 charge–discharge cycles in a two-electrode symmetric configuration. Further, we have presented extensive density functional theory simulations to study the bonding interaction and electronic properties of VSe₂ and its hybrid VSe₂/MXene. The enhanced states near the Fermi level, superior quantum capacitance, and lower diffusion barrier of hybrid VSe₂/MXene over the VSe₂ support the improved charge storage and better capacitive behavior of the hybrid, as indicated by experimental observations. The interaction between VSe₂ and the MXene is due to the electronic charge transfer from the Ti 3d orbital of the MXene to V 3d orbital of VSe₂, in addition to weak van der Waals forces. An asymmetric supercapacitor was also constructed to exploit the high energy storage performance of the VSe₂/MXene electrode. Further, the VSe₂/MXene//MoS₂/MWCNT asymmetric electrode assembly delivered an energy density of 42 W h/kg at power density of 2316 W/kg with a capacitance retention of 90% after 5000 charge–discharge cycles.

更新日期：2022-02-28

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