Metallic 1T′-MoTe₂ Nanoparticle-Incorporated Graphene for Enhanced High Current Hydrogen Evolution and Supercapacitor Performance

The achievement of excellent electrochemically active materials integrating bifunctional hydrogen evolution and supercapacitor performance is very promising in practice. Herein, metallic 1T′-MoTe2 nanoparticles immobilized on reduced graphene oxide (1T′-MoTe2 NPs/rGO) were constructed by in situ tellurization of uniform MoO2 nanospheres. Benefiting from the interaction between 1T′-MoTe2 NPs and rGO via a C–O–Mo bond, the as-obtained 1T′-MoTe2 NPs/rGO has excellent electrochemical activity and kinetics. As a catalyst, 1T′-MoTe2 NPs/rGO exhibited efficient HER performance, and a high current density (1 A cm–2) has been achieved with an overpotential of 520 mV. Furthermore, the cooperative effect of improved conductivity and increased specific surface areas enables the assembling asymmetric 1T′-MoTe2 NPs/rGO//active carbon supercapacitor to exhibit high energy storage performance (98.8 F g–1 at 1 A g–1), excellent rate capacitance, and high operational stability. This work offers a feasible method to construct a multifunctional nanocomposite for green energy generation and storage.