3D porous MnCo2S4 network decorated nitrogen-doped monolayer Ti3C2 based supercapacitors with superior energy density

The development of supercapacitors generally suffers from the used anodes with insufficient energy density. In this paper, nitrogen-doped monolayered Ti3C2 (N-Ti3C2) is synthesized via a facile urea assisted solvothermal route and then abundant MnCo2S4 curved nanosheets are directly in-situ grown on their surface to form a novel 3D porous anode material (N-Ti3C2/MnCo2S4). The expanded interlayer spacing of nitrogen-doped Ti3C2 can effectively facilitate ion diffusion as well as regulate the growth of MnCo2S4 nanosheets. Subsequently, the highly conductive 3D MnCo2S4 porous network further gives a rapid pathway for ions and electrolyte transfer. Hence, N-Ti3C2/MnCo2S4 electrode delivers an ultra-high mass capacitance of 1243.1 F g-1 at 5 mV s-1. Furthermore, the asymmetric supercapacitors (ASCs) based on N-Ti3C2/MnCo2S4 not only acquires a higher energy density of 162.8 Wh kg-1 at the power density of 2700.0 W kg-1 under a wide potential window of 0-1.5 V, but also exhibits an outstanding cycling durability with a minor loss of 6.20 % after 10,000 charge and discharge cycles.

Automated summary

In this study, a novel nitrogen-doped Ti3C2/MnCo2S4 3D porous anode material was synthesized, which exhibits enhanced charge transfer rate and electrolyte mass through structure regulation and increased interlayer spacing. The electrode material demonstrates high energy density and outstanding cycling stability.