Pseudocapacitive materials with superior electrochemical properties have attracted significant interest in developing high-performance supercapacitors. Herein, VO anchored TiCT MXene pseudocapacitive materials are synthesized via a solvothermal method to synergize metallic electrical conductivity and redox activity. Pure vanadium oxide synthesis results in VO formation, while in the presence of TiCT, quasi-metallic VO and VO (VO) are observed due to the decomposition of surface functionalities of TiCT. The growth of the VO phase increases with an increase in the weight concentration of TiCT. The optimal composition of heterostructure delivers a specific capacitance of 364 F g in a stable potential window of −0.9 V–1 V, surpassing the specific capacitance of pure VO (245 F g) and TiCT (140 F g) in 0.5 M KSO electrolyte. Furthermore, the developed symmetric supercapacitor (SSC) delivers an energy density of 45.7 Wh kg at a power density of 1.1 kW kg with cyclic stability of 78 % for 10000 cycles with a self-discharge open circuit potential of 1.34 V. This work highlights a strategy to develop anodic and cathodic active pseudocapacitive material based SSC to improve energy density and mitigate self-discharge.

中文翻译：

---

用于高性能 2.2 V 超级电容器的 VOx 锚定 Ti3C2Tx MXene 异质结构

具有优异电化学性能的赝电容材料引起了人们对开发高性能超级电容器的浓厚兴趣。在此，通过溶剂热法合成了 VO 锚定的 TiCT MXene 赝电容材料，以协同金属导电性和氧化还原活性。纯氧化钒的合成会导致 VO 的形成，而在 TiCT 存在下，由于 TiCT 表面官能团的分解，观察到准金属 VO 和 VO (VO)。 VO相的生长随着TiCT重量浓度的增加而增加。异质结构的最佳组成在-0.9 V-1 V的稳定电位窗口内提供了364 F g的比电容，超过了0.5 M KSO电解质中纯VO (245 F g)和TiCT (140 F g)的比电容。此外，所开发的对称超级电容器（SSC）在功率密度为1.1 kW kg时提供了45.7 Wh kg的能量密度，10000次循环的循环稳定性为78％，自放电开路电位为1.34 V。这项工作强调了开发基于SSC的阳极和阴极活性赝电容材料的策略，以提高能量密度并减轻自放电。