• Journal of Inorganic Materials
  • Vol. 39, Issue 11, 1212 (2024)
Shaofei CHAO1, Yanhui XUE1, Qiong WU1,*, Fufa WU1..., Sufyan Javed MUHAMMAD2 and Wei ZHANG3|Show fewer author(s)
Author Affiliations
  • 11. School of Materials Science and Engineering, Liaoning University of Technology, Jinzhou 121001, China
  • 22. School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China
  • 33. Key Laboratory of Automobile Materials MOE, Jilin Provincial International Cooperation, Key Laboratory of High-Efficiency Clean Energy Materials, Electron Microscopy Center, International Center of Future Science, School of Materials Science & Engineering, Jilin University, Changchun 130012, China
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    DOI: 10.15541/jim20240130 Cite this Article
    Shaofei CHAO, Yanhui XUE, Qiong WU, Fufa WU, Sufyan Javed MUHAMMAD, Wei ZHANG. Efficient Potassium Storage through Ti-O-H-O Electron Fast Track of MXene Heterojunction[J]. Journal of Inorganic Materials, 2024, 39(11): 1212 Copy Citation Text show less

    Abstract

    MXenes with two-dimensional layered structure are widely used in the field of potassium ion supercapacitors because of their excellent electrical properties and adjustable surface functional groups, but their limited dual-capacitor storage capacity severely retards the application of MXenes materials in electrode materials. In this work, the strategy of “Lewis acid molten salt pre-etching + liquid phase etching + in situ hydrothermal recombination” was used to prepare the Ti3C2-based heterojunction with Ti3C2 as matrix and MnO2 coated surface to improve the storage of potassium ions in electrode materials. The connection mode, electrical properties and the change of potassium adsorption law at Ti3C2-based heterojunction interfaces were studied by using the first principles calculation method based on density functional theory. The results show that the maximum adsorption capacity of potassium ions in the constructed Ti3C2-based heterojunction is about 3 times that of Ti3C2. The presence of Ti-O-H-O connecting channel increases the number of free electrons in MnO2, causing Ti3C2-based heterojunction exhibiting excellent electrical properties. The electrochemical test results of the three-electrode system show that, at a current density of 1 A·g-1, Ti3C2-based heterojunction can provide 431 F·g-1 specific capacitance which is much higher than 128 F·g-1 of bare Ti3C2. At a voltage sweep rate of 100 mV·s-1, the contribution of pseudocapacitance is up to 89%. In addition, the Ti3C2-based heterojunction exhibits lower electrochemical impedance, which improves the potassium ion transport rate and electron transfer rate. Therefore, this study demonstrates that the electrochemical performance of Ti3C2 matrix can be improved by constructing Ti3C2-based heterojunction, and the corresponding energy storage mechanism can provide a theoretical basis for the design of other MXenes-based electrode materials.
    Shaofei CHAO, Yanhui XUE, Qiong WU, Fufa WU, Sufyan Javed MUHAMMAD, Wei ZHANG. Efficient Potassium Storage through Ti-O-H-O Electron Fast Track of MXene Heterojunction[J]. Journal of Inorganic Materials, 2024, 39(11): 1212
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