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Material Sciences 2026
过渡金属Zn2+表面修饰Ti3C2Tx Mxene构筑高性能超级电容器负极
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Abstract:
Ti3C2Tx Mxene因其独特的理化特性，被广泛认为是高性能超级电容器的有前景的负极材料。然而，其储能潜力受限于固有缺陷，如层间堆叠问题及存在不利的-F表面端基。本研究报道了一种调控并提升Ti3C2Tx电化学性能的表面修饰策略。采用离子交换法将Zn2+离子嵌入Ti3C2Tx的层间间隙，有效扩展了离子扩散路径并暴露更多活性位点。经此结构调控后，所得Ti3C2Tx-Zn薄膜电极在1 A·g？1的电流密度下比电容高达361 F·g？1，较原始Ti3C2Tx薄膜电极(242 F·g？1)提升1.43倍；电流密度升至20 A·g？1时电容保持率为85%，10 A·g？1电流密度下1万次循环后容量保持率高达99.8%，展现出优异倍率性能与良好的循环稳定性。本研究通过层间工程优化Ti3C2Tx表面组分与结构，为过渡金属离子表面修饰MXene材料在超级电容器中的应用提供了科学依据与技术参考。
Ti3C2Tx Mxene, with its distinctive physicochemical properties, is widely regarded as a promising anode material for high-performance supercapacitors. However, its energy storage potential is limited by inherent shortcomings, such as interlayer restacking and the presence of unfavorable –F surface terminations. This study reports a surface modification strategy aimed at regulating and improving the electrochemical performance of Ti3C2Tx. Through an ion-exchange approach, Zn2+ ions were intercalated into the interlayer gaps of Ti3C2Tx, effectively enlarging the ion diffusion pathways and exposing more active sites. After this structural modification, the resulting Ti3C2Tx-Zn film electrode delivered a high specific capacitance of 361？ F·g？1 at a current density of 1？ A·g？1, which is 1.43？times that of the pristine Ti3C2Tx film electrode (242？ F·g？1). The electrode also exhibited superior rate capability with 85% capacitance retention at 20？ A·g？1, as well as excellent cycling stability with 99.8% capacitance retention after 10,000 cycles at 10？ A·g？1. This work demonstrates that interlayer engineering can effectively optimize the surface composition and structure of Ti3C2Tx, providing scientific and technical insights into the application of transition-metal-ion surface modification of MXene materials in supercapacitors.
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