In situ grown nickel selenide on graphene nanohybrid electrodes for high energy density asymmetric supercapacitors
2018; Royal Society of Chemistry; Volume: 10; Issue: 43 Linguagem: Inglês
10.1039/c8nr06345a
ISSN2040-3372
AutoresBalakrishnan Kirubasankar, Vignesh Murugadoss, Jing Lin, Tao Ding, Mengyao Dong, Hu Liu, Jiaoxia Zhang, Tingxi Li, Ning Wang, Zhanhu Guo, Subramania Angaiah,
Tópico(s)Graphene research and applications
ResumoNickel selenide (NiSe) nanoparticles uniformly supported on graphene nanosheets (G) to form NiSe-G nanohybrids were prepared by an in situ hydrothermal process. The uniform distribution of NiSe on graphene bestowed the NiSe-G nanohybrid with faster charge transport and diffusion along with abundant accessible electrochemical active sites. The synergistic effect between NiSe nanoparticles and graphene nanosheets for supercapacitor applications was systematically investigated for the first time. The freestanding NiSe-G nanohybrid electrode exhibited better electrochemical performance with a high specific capacitance of 1280 F g-1 at a current density of 1 A g-1 and a capacitance retention of 98% after 2500 cycles relative to that of NiSe nanoparticles. Furthermore, an asymmetric supercapacitor device assembled using the NiSe-G nanohybrid as the positive electrode, activated carbon as the negative electrode and an electrospun PVdF membrane containing 6 M KOH as both the separator and the electrolyte delivered a high energy density of 50.1 W h kg-1 and a power density of 816 W kg-1 at an extended operating voltage of 1.6 V. Thus, the NiSe-G nanohybrid can be used as a potential electrode material for high-performance supercapacitors.
Referência(s)