In-situ synthesized and induced vertical growth of cobalt vanadium layered double hydroxide on few-layered V2CTx MXene for high energy density supercapacitors

• Published in: Journal of colloid and interface science Vol. 661; pp. 460 - 471
• Main Authors: Yu, Tingting, Li, Shaobin, Li, Fengbo, Zhang, Li, Wang, Yuping, Sun, Jingyu
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01.05.2024
• Subjects: capacitance; cobalt; CoV-LDH; electrochemical capacitors; Electrode material; electrodes; energy density; foams; nanosheets; renewable energy sources; research planning; Self-supported structure; Supercapacitor; V2CTx MXene; vanadium; Supercapacitor; CoV-LDH; V2CTx MXene; Electrode material; Self-supported structure
• ISSN: 0021-9797; 1095-7103; 1095-7103
• DOI: 10.1016/j.jcis.2024.01.206

One-step hydrothermal method is used for the simultaneous construction of three-dimensional self-supported TMA-V2CTx/CoV-LDH/NF composites as binder-free electrodes, which demonstrated excellent supercapacitor performance. [Display omitted] Two-dimensional (2D) MXene nanomaterials display great potential for green energy storage. However, as a result of self-stacking of MXene nanosheets and the presence of conventional binders, MXene-based nanomaterials are significantly hindered in their rate capability and cycling stability. We successfully constructed a self-supported stereo-structured composite (TMA-V2CTx/CoV-LDH/NF) by in-situ growing 2D cobalt vanadium layered double hydroxide (CoV-LDH) vertically on 2D few-layered V2CTx MXene nanosheets and interconnecting it with Ni foam (NF) with a self-supported structure to act as a binder-free electrode. In addition to inhibiting CoV-LDH aggregation, the highly conductive V2CTx MXene and CoV-LDH work synergistically to improve charge storage. The specific capacitance of the TMA-V2CTx/CoV-LDH/NF electrode is 2374 F/g (1187 C/g) at 1 A/g. At the same time, the TMA-V2CTx/CoV-LDH/NF exhibits excellent stability, retaining 85.3 % of its specific capacitance at 20 A/g after 10,000 cycles. In addition, the hybrid supercapacitor (HSC) is assembled based on positive electrode (TMA-V2CTx/CoV-LDH/NF) and negative electrode (AC), achieving the maximum energy density of 74.4 Wh kg−1 at 750.3 W kg−1. TMA-V2CTx/CoV-LDH/NF has potential as an electrode material for storing green energy. The research strategy provides a development prospect for the construction of novel V2CTx MXene-based electrode material with self-supported structures.