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Material Sciences 2025
Mn2+修饰二维层状Ti3C2Tx用于高性能超级电容器负极材料
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Abstract:
二维层状Ti3C2Tx因其独特的二维结构、金属导电性、丰富的化学表面、负的工作电势窗口，被认为非常具有应用前景的超级电容器负极材料。然而，二维纳米片层不可避免的堆叠导致其活性表面无法充分利用，限制其电化学性能。本文界面工程调控Ti3C2Tx表面，提高其活性表面利用率，提高其电荷存储能力。首先采用碱性溶液KOH预处理Ti3C2Tx，定向减少表面-F官能团，得到K+嵌入到Ti3C2Tx；再通过离子交换，实现过渡金属Mn2+离子插层，成功制备Mn2+修饰的Ti3C2Tx材料(Mn2+-Ti3C2Tx)。由于所制备Mn2+-Ti3C2Tx纳米片表面的Mn原子d轨道对周围-O官能团有很强的施主效应，对电解质离子有更强的吸附作用，能够促进电解质离子的输运，促进电化学反应在表面上进行，使得Mn2+-Ti3C2Tx电极材料在电流密度为1 A g？1时展现出323F g？1的高比容量。并且，在电流密度为20 A g？1时，电容保持率为83%。本文报道了一种高性能的Mn2+修饰的Ti3C2Tx材料，为超级电容器电极材料的开发提供了新的思路。
Two-dimensional layered Ti3C2Tx is considered a very promising negative electrode material for supercapacitor applications due to its unique two-dimensional structure, metallic conductivity, abundant chemical surfaces, and negative working potential window. However, the unavoidable stacking of 2D nanosheets leads to the underutilization of its active surface, limiting its electrochemical performance. In this paper, interfacial engineering modulates the Ti3C2Tx surface to improve its active surface utilization and enhance its charge storage capacity. Firstly, Ti3C2Tx was pretreated with an alkaline solution of KOH to directionally reduce the -F surface functional groups, obtaining K+-embedded Ti3C2Tx. Subsequently, through ion exchange, the intercalation of Mn2+ transition metal ions was achieved, successfully fabricating Mn2+-modified Ti3C2Tx material (Mn2+-Ti3C2Tx). Owing to the strong donor effect of the d orbitals of Mn atoms on the surface of the prepared Mn2+-Ti3C2Tx nanosheets on the surrounding -O functional groups, there is a stronger adsorption of electrolyte ions, which promotes the transport of electrolyte ions and facilitates the electrochemical reaction on the surface, enabling the
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