Teak wood-derived mesoporous carbon and its composite with molybdenum sulphide for electrochemical oxygen reduction

In this work, a mesoporous carbon (MPC) material was prepared from teak wood (Tectonagrandis) sawdust. Further, a composite of molybdenum sulphide (MoS₂) and MPC (MPC–MoS₂) was prepared. The synthesised materials were characterized by different spectroscopic and microscopic techniques. Fourier transforms infrared spectrum of MPC–MoS₂ indicates a weak interaction between MPC and MoS₂. Raman studies revealed a slight decrease in the graphitization (compared to MPC) of the MPC–MoS₂ due to the integration of MoS₂ on MPC. X-ray diffraction patterns of MPC–MoS₂ demonstrates the hybrid nature of the composite. Scanning electron microscopy images expose the morphology of the MPC–MoS₂ as a rough and granular surface with small-sized flake-like appearances due to the presence of MoS₂ on the surface of MPC. Hydrodynamic voltammetry studies on the MPC–MoS₂ material disclose an efficient oxygen reduction activity. Based on the rotating ring disc electrode studies, a direct four-electron reduction of oxygen was established. Therefore, MPC–MoS₂ could be employed as an efficient low-cost material to replace the high-cost Pt-based oxygen reduction catalysts which are currently being used in commercial fuel cells.

Scheme: Indicating the preparation of MPC using Teak’s wood saw dust, formation of GC/MPC-MoS₂ and its application towards electrochemical oxygen reduction reaction.