Low-cost flexible supercapacitors with high-energy density based on nanostructured MnO₂ and Fe₂O₃ thin films directly fabricated onto stainless steel
Gund, Girish S. (Institut Català de Nanociència i Nanotecnologia)
Dubal, Deepak P. (Institut Català de Nanociència i Nanotecnologia)
Chodankar, Nilesh R. (Shivaji University. Department of Physics)
Cho, Jun Y. (Seoul National University. Department of Materials Science and Engineering)
Gómez-Romero, Pedro 1959- (Institut Català de Nanociència i Nanotecnologia)
Park, Chan (Seoul National University. Department of Materials Science and Engineering)
Lokhande, Chandrakant D. (Shivaji University. Department of Physics)

Data:	2015
Resum:	The facile and economical electrochemical and successive ionic layer adsorption and reaction (SILAR) methods have been employed in order to prepare manganese oxide (MnO₂) and iron oxide (Fe₂O₃) thin films, respectively with the fine optimized nanostructures on highly flexible stainless steel sheet. The symmetric and asymmetric flexible-solid-state supercapacitors (FSS-SCs) of nanostructured (nanosheets for MnO₂ and nanoparticles for Fe₂O₃) electrodes with Na₂SO₄/Carboxymethyl cellulose (CMC) gel as a separator and electrolyte were assembled. MnO₂ as positive and negative electrodes were used to fabricate symmetric SC, while the asymmetric SC was assembled by employing MnO₂ as positive and Fe₂O₃ as negative electrode. Furthermore, the electrochemical features of symmetric and asymmetric SCs are systematically investigated. The results verify that the fabricated symmetric and asymmetric FSS-SCs present excellent reversibility (within the voltage window of 0-1 V and 0-2 V, respectively) and good cycling stability (83 and 91%, respectively for 3000 of CV cycles). Additionally, the asymmetric SC shows maximum specific capacitance of 92 Fg⁻¹, about 2-fold of higher energy density (41. 8 Wh kg⁻¹) than symmetric SC and excellent mechanical flexibility. Furthermore, the "real-life" demonstration of fabricated SCs to the panel of SUK confirms that asymmetric SC has 2-fold higher energy density compare to symmetric SC.
Ajuts:	Ministerio de Economía y Competitividad SEV-2013-0295
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Publicat a:	Scientific reports, Vol. 5 (July 2015) , art. 12454, ISSN 2045-2322

DOI: 10.1038/srep12454
PMID: 26208144

13 p, 2.4 MB

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