电化学
纳米技术
曲面(拓扑)
化学
表面结构
材料科学
结晶学
物理化学
电极
几何学
数学
作者
Minmin Hu,Lihong Chen,Yunqi Jing,Yuanyuan Zhu,Jun Dai,Alan Meng,Changlong Sun,Junjing Jia,Zhenjiang Li
出处
期刊:Molecules
[MDPI AG]
日期:2023-07-31
卷期号:28 (15): 5776-5776
被引量:2
标识
DOI:10.3390/molecules28155776
摘要
MXene, a new intercalation pseudocapacitive electrode material, possesses a high theoretical capacitance for supercapacitor application. However, limited accessible interlayer space and active sites are major challenges to achieve this high capacitance in practical application. In order to stimulate the electrochemical activity of MXene to a greater extent, herein, a method of hydrothermal treatment in NaOH solution with reducing reagent-citric acid is first proposed. After this treatment, the gravimetric capacitance of MXene exhibits a significant enhancement, about 250% of the original value, reaching 543 F g−1 at 2 mV s−1. This improved electrochemical performance is attributed to the tailoring of an interlayer structure and surface chemistry state. An expanded and homogenized interlayer space is created, which provides enough space for electrolyte ions storage. The –F terminations are replaced with O-containing groups, which enhances the hydrophilicity, facilitating the electrolyte’s accessibility to MXene’s surface, and makes MXene show stronger adsorption for electrolyte ion-H+, providing sufficient electrochemical active sites. The change in terminations further leads to the increase in Ti valence, which becomes more prone to reduction. This work establishes full knowledge of the rational MXene design for electrochemical energy storage applications.
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