Vertically aligned ZnCo2O4 nanoplates on Ti3C2 for high-efficiency hybrid supercapacitors

• Published in: New journal of chemistry 2022-02, Vol.46 (9), p.4385-4394
• Main Authors: Wang, Hao, Zhang, Yu, Guo, Enyan, Hu, Chengge, Lu, Qifang, Wei, Mingzhi, Ma, Jingyun, Si, Conghui
• Format: Article
• Language: English
• Subjects: Activated carbon; Electrochemical analysis; Electrode materials; Electrodes; Flux density; Ion transport; Nanosheets; Structural stability; Supercapacitors; Surface stability
• ISSN: 1144-0546; 1369-9261
• DOI: 10.1039/d1nj05585b

Electrode materials exhibiting higher structural stability and electrochemical activity remain a priority in improving the electrochemical performance of supercapacitors (SCs). Herein, we report the design and synthesis of a novel nanoplate-on-nanosheet architecture with vertically aligned ZnCo2O4 (ZCO) porous nanoplates anchored on ultrathin delaminated-Ti3C2 (d-TC) nanosheets as a high-performance electrode for electrochemical SCs. The unique robust nanoplate-on-nanosheet adhesion promises fast electron and ion transport, large electroactive surface area, and excellent structural stability. Importantly, benefiting from the features of such a configuration, the ZCO/d-TC-350 composite electrode displays a high specific capacity of 195.8 C g−1 at a current density of 1 A g−1. Moreover, the constructed hybrid supercapacitor (HSC) consisting of ZCO/d-TC-350||active carbon (AC) achieves a high energy density of 15.6 W h kg−1 at a power density of 551.1 W kg−1 and superior long-term stability with 89.5% capacitance retention after 4000 cycles. This work provides a promising strategy for the preparation of advanced MXene-based electrodes for electrochemical capacitors.