MoO2/Mo2N hybrid nanobelts doped with gold nanoparticles and their enhanced supercapacitive behavior

Abstract

MoO₂/Mo₂N hybrid nanobelts doped with gold nanoparticles (AuNPMoON) were synthesized via one-step thermal-treatment of MoO₃ nanobelts and HAuCl₄. AuNPMoON nanobelts with a width of ca. 200 nm and an Au content of 1.08 wt% prepared in the presence of HAuCl₄ exhibited a higher specific capacitance of 348 F g⁻¹ than those prepared in the absence of HAuCl₄ (21 F g⁻¹) at a current density of 0.5 A g⁻¹. The influence of Au content on the electrochemical performance of AuNPMoON was investigated. For practical application, two types of supercapacitor devices, PANI||AuNPMoON and AC||AuNPMoON, were assembled. The PANI||AuNPMoON device delivered an energy density of 10.64 W h kg⁻¹, which is higher than that of the AC||AuNPMoON device (8.11 W h kg⁻¹). Meanwhile, the specific capacitance retentions were 87.8% and 85.5% for the PANI||AuNPMoON and AC||AuNPMoON devices after 2000 cycles, respectively.