Self-supported electrode based on two-dimensional NiPS3 for supercapacitor application

Two-dimensional (2D) layered materials hold great promise for electrochemical energy storage due to their unique structure. It is always desirable to explore new-type high-performance 2D structured electrode materials in energy field. In this work, layered transition-metal chalcogenophosphite is developed as the electrode material for supercapacitors for the first time. NiPS3 nanosheet arrays are successfully insitu grown on carbon cloth via a chemical vapor deposition method, and then directly used as the selfsupported electrode for supercapacitors. The fabricated carbon cloth supported NiPS3 nanosheet arrays offer obviously superior electrochemical performance to the powdery NiPS3 nanosheets sample. The self-supported NiPS3 electrode exhibits a high specific capacitance of 1148F g-1 at a current density of 1 A g-1, and a good cycling stability with capacitance retention of 81.4% over 5000 cycles at 10 A g-1. Moreover, the assembled asymmetric supercapacitor device delivers a specific capacitance of 61.3F g-1 at a current density of 1 A g-1, and an energy density of 19.2 Wh kg-1 at a power density of 750 W kg-1 with a voltage window of 1.5 V. This work is of great significance for pioneering the application of 2D transition-metal chalcogenophosphites in supercapacitors. (c) 2022 Elsevier Inc. All rights reserved.

Automated summary

This study developed layered transition-metal chalcogenophosphite as the electrode material for supercapacitors for the first time. NiPS3 nanosheet arrays were grown on carbon cloth via chemical vapor deposition and showed improved electrochemical performance compared to powdery NiPS3 nanosheets. The self-supported NiPS3 electrode exhibited high specific capacitance and cycling stability, and the assembled asymmetric supercapacitor device showed good specific capacitance and energy density.