Electrochemical performance of self-assembled two-dimensional heterostructure of rGO/MoS2/h-BN

We report on preparation and electrochemical performance evaluation of two dimensional (2D) self-assembled heterostructure of graphene oxide (rGO), Molybdenum disulphide (MoS2), and hexagonal boron nitride (h-BN). In present study, rGO-MoS2-h-BN (GMH) multi-layered GMH heterostructure is fabricated by in-situ route chemical technique. In material analysis, the composite consists of bond conformation of C-B-C, Mo-S, C-N, B-N, Mo-C indicating layered stacks of rGO/h-BN/MoS2. In electrochemical analysis, composite performed superior in aqueous medium of cobalt sulphate (CoSO4) over others. CV measurements, carried out over 10-100 mVs-1, showed change in specific capacitance (Csp) from 800 to 100 Fg-1. GMH hardly showed any degradation up to 20,000 cycles @100mVs-1. The calculated Csp, energy-(ED), power-(PD) density has been discussed in light of Nyquist, Bode, and Ragone analysis. Equivalent circuit is simulated for cell and discussed for its discrete electronic components. Due to larger effective electron diffusion length 1000m, broadly, composite showed battery-like characteristic, as supported by radical paramagnetic resonance and transport response. The symmetric electrodes prepared in one step, are facile to fabricate, easy to integrate and involved no pre or post treatment. They possess superior flat cell character, cost effective, and favourable towards practicality at an industrial scale, as demonstrated on the laboratory bench. The details are presented.