Built-in Electric Field Enhanced Electrochemical Performance of Metal–Organic Frameworks (MOFs)-Derived Hollow Dodecahedral Co₄S₃/MoS₂/MnS Heterostructures

Optimizing the heterostructure design is crucial for maximizing the electrochemical activity and electronic properties essential for supercapacitors. Herein, we developed a Co-MOFs-based substrate to create a built-in electric field within the heterostructure, significantly enhancing energy storage kinetics and electrode conductivity. Experimental results highlighted the pivotal role of heterostructures in enhancing supercapacitor materials, as evidenced by measurements of charge transfer coefficient and hydroxide diffusion coefficient. The synthesized Co4S3/MoS2/MnS composite exhibited exceptional specific capacitance of 590 F g–1 at 1 A g–1, while demonstrating outstanding cycling stability with over 90% retention after 45,000 cycles. Furthermore, the assembled asymmetric supercapacitor device exhibits an energy density of 30 W h kg–1 at a power density of 800 W kg–1, maintaining 93% of its initial specific capacity even after 10,000 charge/discharge cycles. The synergistic effects of the internal electric field within Co4S3/MoS2/MnS heterostructure, characterized by a porous structure, diverse redox chemistries, and high conductivity, facilitated enhanced hydrogen evolution reactions (HER) and supercapacitor performance. This leads to significant enhancement of their complementary electrocatalytic HER and supercapacitor energy storage performance. This study highlights the promising potential of incorporating a built-in electric field within electrode materials to elevate the electrochemical performance of supercapacitors and HER, paving the way for future advancements in energy storage technologies.