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

Abstract

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 Fg−1 at 5 mVs−1. Furthermore, the asymmetric supercapacitors (ASCs) based on N-Ti3C2/MnCo2S4 not only acquires a higher energy density of 162.8 Whkg−1 at the power density of 2700.0 Wkg−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.