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

MoO2/Mo2N hybrid nanobelts doped with gold nanoparticles (AuNPMoON) were synthesized via onestep 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 parallel to AuNPMoON and AC parallel to AuNPMoON, were assembled. The PANI parallel to AuNPMoON device delivered an energy density of 10.64 W h kg(-1), which is higher than that of the AC parallel to AuNPMoON device (8.11 W h kg(-1)). Meanwhile, the specific capacitance retentions were 87.8% and 85.5% for the PANI parallel to AuNPMoON and AC parallel to AuNPMoON devices after 2000 cycles, respectively.