Enabling methanol oxidation by an interacting hybrid nanosystem of spinel Co3O4 nanoparticle decorated MXenes

For the successful implementation of direct methanol fuel cells in commercial applications, highly efficient and durable non-noble electrocatalysts based on conducting and stable non-carbonaceous supports can be potential candidates. Herein, spinel Co3O4 nanoparticles are decorated over Ti3C2 MXene nanosheets for methanol oxidation. The hybrid nanosystem Ti3C2/Co3O4 (TC) reduces restacking of MXene nanosheets, which offers a larger surface area for Co3O4 dispersion, leading to a shorter path for the charge carriers. TC coated on glassy carbon (GC) exhibits a MOR current density of 38.38 A g(-1) which is 2.9 times higher than that of Co3O4/GC in 1.5 M methanol at a 20 mV s(-1) scan rate. The hydrophilic terminations on the surface of MXenes create strong interactions with the Co3O4 nanoparticles, which increase the MOR kinetics of the nanocomposite. A low onset potential (0.32 V), high oxidation current density of the nanocomposite, efficient durability and cycling stability up to 200 CV cycles make this nanocomposite a better alternative to the state-of-the-art noble-metal electrocatalysts.

Automated summary

In this study, a new type of nanocomposite Ti3C2/Co3O4 is proposed, which exhibits high electrocatalytic performance and durability in direct methanol fuel cells. The nanocomposite has a large surface area and a short charge carrier transport path, significantly improving the efficiency of the methanol oxidation reaction. In addition, the nanocomposite also shows a low onset potential, high oxidation current density, and good cycling stability.