%0 Journal Article %T Mn²⁺修饰二维层状Ti₃C₂T_x用于高性能超级电容器负极材料
Mn²⁺ Modified Two-Dimensional Layered Ti₃C₂T_x as Negative Electrode Material for High-Performance Supercapacitor %A 谢洪楠 %A 李璐 %J Material Sciences %P 1-8 %@ 2160-7621 %D 2025 %I Hans Publishing %R 10.12677/ms.2025.151001 %X 二维层状Ti₃C₂T_x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Ti₃C₂T_x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Ti₃C₂T_x，定向减少表面-F官能团，得到K⁺嵌入到Ti₃C₂T_x；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Ti₃C₂T_x材料(Mn²⁺-Ti₃C₂T_x)。由于所制备Mn²⁺-Ti₃C₂T_x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⁺-Ti₃C₂T_x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Ti₃C₂T_x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 Ti₃C₂T_x 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 Ti₃C₂T_x surface to improve its active surface utilization and enhance its charge storage capacity. Firstly, Ti₃C₂T_x was pretreated with an alkaline solution of KOH to directionally reduce the -F surface functional groups, obtaining K⁺-embedded Ti₃C₂T_x. Subsequently, through ion exchange, the intercalation of Mn²⁺ transition metal ions was achieved, successfully fabricating Mn²⁺-modified Ti₃C₂T_x material (Mn²⁺-Ti₃C₂T_x). Owing to the strong donor effect of the d orbitals of Mn atoms on the surface of the prepared Mn²⁺-Ti₃C₂T_x 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 %K 离子修饰， %K 超级电容器， %K 电化学性能
Ionic Modification %K Supercapacitor %K Electrochemical Performance %U http://www.hanspub.org/journal/PaperInformation.aspx?PaperID=104973