Synergistic effects in 3D honeycomb-like hematite nanoflakes/branched polypyrrole nanoleaves heterostructures as high-performance negative electrodes for asymmetric supercapacitors
Tang, PengYi (Institut Català de Nanociència i Nanotecnologia)
Han, Li-Juan (Institut Català d'Investigació Química)
Genç, Aziz (Institut Català de Nanociència i Nanotecnologia)
He, Yong-Min (Lanzhou University)
Zhang, Xuan (DKU Leuven. Department of Materials Science)
Zhang, Lin (The Ohio State University. Department of Integrated System Engineering)
Galán-Mascarós, José Ramón (Institut Català d'Investigació Química)
Morante, Joan Ramon (Institut de Recerca en Energia de Catalunya)
Arbiol i Cobos, Jordi (Institut Català de Nanociència i Nanotecnologia)

Date:	2016
Abstract:	Rational assembly of unique branched heterostructures is one of the facile techniques to improve the electrochemical figure of merit of materials. By taking advantages of hydrogen bubbles dynamic template, hydrothermal method and electrochemical polymerization, branched polypyrrole (PPy) nanoleaves decorated honeycomb-like hematite nanoflakes (core-branch FeO@PPy) are fabricated. X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy (TEM), high-resolution TEM, and scanning transmission electron microscopy in high angle annular dark field mode with electron energy loss spectroscopy were combined to elucidate the mechanisms underlying formation and morphogenesis evolution of core-branch FeO@PPy heterostructures. Benefiting from the stability of honeycomb-like hematite nanoflakes and the high conductivity of PPy nanoleaves, the resultant core-branch FeO@PPy exhibits an ultrahigh capacitance of 1167. 8 F g at 1 A g in 0. 5 M NaSO aqueous solution. Moreover, the assembled bi-metal oxides asymmetric supercapacitor (FeO@PPy//MnO) gives rise to a maximum energy density of 42. 4 W h kg and a maximum power density of 19. 14 kW kg with an excellent cycling performance of 97. 1% retention after 3000 cycles at 3 A g. These performance features are superior than previous reported iron oxide/hydroxides based supercapacitors, offering an important guideline for future design of advanced next-generation supercapacitors.
Grants:	Ministerio de Economía y Competitividad MAT2014-59961-C2-2-R Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-1638 Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-797
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Subject:	Core-branch ; Negative electrode ; PPy ; Synergistic effects
Published in:	Nano Energy, Vol. 22 (April 2016) , p. 189-201, ISSN 2211-2855

DOI: 10.1016/j.nanoen.2016.02.019

Post-print 31 p, 2.7 MB

The record appears in these collections:
Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles