High-energy density asymmetric supercapacitors with bimetallic Mo-Ni sulfides anchored on boron carbon nitride matrix

One of the current challenges in energy storage applications is the development of electrode materials that can generate high specific capacitance with considerable energy and power density. Here, our work demonstrates the fabrication of hierarchical MoNiS (Molybdenum Nickel Sulfide) anchored BCN (Boron Carbon Nitride) nanosheets as an anode electrode material for the production of asymmetric supercapacitor (ASSC) device. The facile in-situ hydrothermal reactions are utilized for the synthesis of MoNiS and MoNiS/BCN nanostructures used as electrocatalysts in supercapacitor applications. The morphological and structural analysis confirmed the successful integration of MoNiS flowers anchored on the BCN hybrid matrix. As an electroactive material, MoNiS/ BCN nanostructures with the optimized mass have exhibited outstanding electrochemical activity with a specific capacitance of 1157 Fg- 1 at 1 A g- 1 current density, 96 % of its initial retention after 10,000 consecutive GCD cycles in 1 M of KOH electrolyte. The MoNiS/BCN/AC asymmetric device comprises an anode (MoNiS/BCN) and cathode (AC) with an excellent specific capacitance of 56.2 F g- 1 at 1 Ag- 1 with a high energy density of 70 Whkg- 1 at power density 1200 Wkg- 1. The combination of MoNiS and BCN is favoured by the exposure of several electrochemical active sites for rapid transportation of electron and electrolyte diffusion, resulting in better cycling retention.