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MXene/导电金属有机骨架(c-MOF)复合材料的制备及其超级电容器性能研究
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Abstract:
为制备电化学性能优异的超级电容器电极材料，采用在MXenes (Ti2CTx)表面原位自组装导电金属有机骨架化合物(c-MOFs)的方法制备Ti2CTx/c-MOF复合材料。考察了Ti2CTx含量对复合材料形貌结构及电化学性能的影响。通过调节Ti2CTx分散液的浓度，来控制Ti2CTx基底的量，从而控制c-MOF在Ti2CTx表面上的生长高度，最终探究出Ti2CTx/c-MOF复合材料的最佳形貌结构。研究表明0.25-Ti2CTx/c-MOF复合材料电极，在0.5 A·g？1电流密度下具有171 F·g？1的质量比电容，约为相同条件下Ti2CTx的2.5倍，c-MOF的1.3倍，展现出优良的储能性能。同时，由该复合材料构建的对称超级电容器，在3 A·g？1的大电流密度下循环充/放电5000次后，比电容保持率为62%，具有良好的稳定性。以上研究为制备新型Ti2CTx/MOF复合材料提供了科学指导和理论依据。
In order to prepare supercapacitor electrode materials with excellent electrochemical properties, Ti2CTx/c-MOF composites were prepared by in-situ self-assembly of conductive metal-organic frameworks (c-MOFs) on the surface of MXenes (Ti2CTx). The effects of Ti2CTx content on the morphological structure and electrochemical properties of the Ti2CTx/c-MOF composites were investigated. By adjusting the concentration of the Ti2CTx dispersion, the amount of Ti2CTx substrate can be controlled, so as to control the growth height of c-MOF on Ti2CTx surface, and finally the optimal morphological structure of Ti2CTx/c-MOF composites was explored. The results show that the 0.25-Ti2CTx/c-MOF composite electrode has a mass specific capacitance of 171 F？g？1 at a current density of 0.5 A？g？1, which is about 2.5 times that of Ti2CTx and 1.3 times that of c-MOF under the same conditions, demonstrating excellent energy storage performance. In addition, the symmetric supercapacitor constructed by this composite material has good cyclic stability, and the initial capacitance remains above 62% after 5,000 cycles at a high current density of 3 A·g？1. This study provides scientific guidance and theoretical basis for the preparation of novel Ti2CTx/MOF composites.
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