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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. [ABSTRACT FROM AUTHOR]

[Display omitted] • Hierarchical 1D/2D Ni(OH) 2 /PCC is fabricated via a facile hydrothermal route as the positive electrode. • The porous corn stigma-derived carbon with the 3D open framework is preparated as the negative electrode. • Explore the excellent electrochemical performance of 1D/2D Ni(OH) 2 /PCC by DFT. • The hybrid supercapacitor displays supeiror energy and power density. Enhancing the energy density of supercapacitors is of great scientific and technological importance, producing a larger energy density than traditional symmetrical carbon supercapacitors. Herein, a hybrid supercapacitor based on an activated corn stigma-derived carbon (PCC) electrode combined with a large-capacity faradic 1D nanofiber/2D nanosheet Ni(OH) 2 electrode is designed to fulfill this goal. Benefiting from the highly conductive, porous construction, and 3D open framework of PCC electrode couple with unique hierarchical 1D nanofiber/2D nanosheet Ni(OH) 2 , such 1D/2D Ni(OH) 2 /PCC electrode is capable of increasing accessible active sites, shortening ion-diffusion path, and accelerating mass transfer. More importantly, DFT calculations unveil that 1D/2D Ni(OH) 2 /PCC composites own high electrical conductivity and OH– adsorption energy. Therefore, the specific capacity of the 1D/2D Ni(OH) 2 /PCC composite electrode reaches 655.9C g−1 at the current density of 1 A/g. Moreover, such hybrid 1D/2D Ni(OH) 2 /PCC||PCC supercapacitor show an outstanding energy density and power density of 38.6 Wh kg−1, and 1.03 kW kg−1, respectively. This work provides the possibility of fabricating hierarchical hydroxide/bio-carbon as a better electrode for high-energy–density electrochemical supercapacitors. [ABSTRACT FROM AUTHOR]