Engineering hierarchical porous ternary Co-Mn-Cu-S nanodisk arrays for ultra-high-capacity hybrid supercapacitors

Transition-metal sulfides have been recognized as one of the promising electrodes for high-performance hybrid supercapacitors (HSCs). However, the poor rate performance and short cycle life heavily impede their practical applications. Herein, an advanced electrode based on hierarchical porous cobaltmanganese-copper sulfide nanodisk arrays (Co-Mn-Cu-S HPNDAs) on Ni foam is fabricated for highcapacity HSCs, using metal-organic frameworks as the self-sacrificial template. The synergistic effects of ternary Co-Mn-Cu sulfides and the hierarchical porous structure endow the as-obtained electrode with fast redox reaction kinetics. As expected, the resultant Co-Mn-Cu-S HPNDAs electrode delivers an ultrahigh specific capacity of 536.8 mAh g-1 (3865 F g-1) at 2 A g-1 with a superb rate performance of 63% capacity retention at 30 A g-1. Remarkably, an energy density of 63.8 W h kg-1 at a power density of 743 W kg-1 with a long cycle life is also achieved with the quasi-solid-state Co-Mn-Cu-S HPNDAs// ZIF-8-derived carbon HSC. This work offers a new pathway to fabricate high-performance multiple transition-metal-sulfide-based electrode materials for energy storage devices. (c) 2021 Elsevier Inc. All rights reserved.

Automated summary

In this study, an advanced electrode based on hierarchical porous cobalt-manganese-copper sulfide nanodisk arrays was successfully fabricated, using metal-organic frameworks as sacrificial templates. The obtained electrode exhibited fast redox reaction kinetics and excellent specific capacity and rate performance. Furthermore, the hybrid supercapacitor using this electrode achieved high energy density, high power density, and long cycle life.