Design and characterization of monolayer Ti3C2 MXene/NiCo2O4 nanocones hybrid architecture for asymmetric supercapacitors

• Published in: Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2022-10, Vol.923, p.116787, Article 116787
• Main Authors: Wang, Lu, Cao, Jiayao, Zhou, Ying-Hua, Liu, Xiaoheng
• Format: Article
• Language: English
• Subjects: Activated carbon; Asymmetric supercapacitors; Asymmetry; Electrode materials; Electrodes; Energy storage; Functional groups; High energy density; Monolayers; Multilayers; MXenes; Nickel compounds; NiCo2O4 nanocones; Redox reactions; Single-layered Ti3C2; Supercapacitors
• ISSN: 1572-6657; 1873-2569
• DOI: 10.1016/j.jelechem.2022.116787

•NiCo2O4 was hydrothermal grown on the manolayer Ti3C2 nanosheets.•The s-Ti3C2/NiCo2O4 hybrid architecture presents the outstanding electrochemical performances.•The fabricated asymmetric device based on s-Ti3C2/NiCo2O4 delivered an enhanced energy density under a broad voltage window. The 2D Ti3C2Tx MXene are promising supercapacitor electrode materials due to their considerable high conductivity, surface functional groups, and redox reactions, however, also subjected to compact restack of multi-layered structure. In this study, monolayer Ti3C2Tx modified by NiCo2O4 nanocones (s-Ti3C2/NiCo2O4) with large specific surface area (158.8 m2∙g−1) were designed and obtained by a facile method. Then an asymmetric device was assembled based on positive s-Ti3C2/NiCo2O4 electrode and negative active carbon electrode for the first time. Then, a widened voltage window of 1.6 V for asymmetric device is realized, which is almost twice wider than that of the common symmetric device. The device deliveries a maximum specific capacitance of 73.8F∙g−1 at 1A∙g−1 with a good stability. More importantly, the energy density of device also is significantly enhanced to 94.46 Wh∙kg−1 at a power density of 2882.0 W∙kg−1, supporting a substantial promise for energy storage applications.