Asymmetric Supercapacitors Based on Reduced Graphene Oxide with Different Polyoxometalates as Positive and Negative Electrodes
Dubal, Deepak P. (Institut Català de Nanociència i Nanotecnologia)
Chodankar, Nilesh R. (Chonnam National University)
Vinu, Ajayan (University of South Australia)
Kim, Do-Heyoung (Chonnam National University)
Gómez-Romero, Pedro 1959- (Institut Català de Nanociència i Nanotecnologia)

Fecha:	2017
Resumen:	Nanofabrication using a "bottom-up" approach of hybrid electrode materials into a well-defined architecture is essential for next-generation miniaturized energy storage devices. This paper describes the design and fabrication of reduced graphene oxide (rGO)/polyoxometalate (POM)-based hybrid electrode materials and their successful exploitation for asymmetric supercapacitors. First, redox active nanoclusters of POMs [phosphomolybdic acid (PMo) and phosphotungstic acid (PW)] were uniformly decorated on the surface of rGO nanosheets to take full advantage of both charge-storing mechanisms (faradaic from POMs and electric double layer from rGO). The as-synthesized rGO-PMo and rGO-PW hybrid electrodes exhibited impressive electrochemical performances with specific capacitances of 299 (269 mF cm) and 370 F g (369 mF cm) in 1 m HSO as electrolyte at 5 mA cm. An asymmetric supercapacitor was then fabricated using rGO-PMo as the positive and rGO-PW as the negative electrode. This rGO-PMo∥rGO-PW asymmetric cell could be successfully cycled in a wide voltage window up to 1. 6 V and hence exhibited an excellent energy density of 39 Wh kg (1. 3 mWh cm) at a power density of 658 W kg (23 mW cm).
Derechos:	Tots els drets reservats.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió sotmesa a revisió
Materia:	Asymmetric supercapacitors ; Carbon ; Hybrid materials ; Polyoxometalates ; Reduced graphene oxide
Publicado en:	ChemSusChem, Vol. 10, Issue 13 (July 2017) , p. 2742-2750, ISSN 1864-564X

DOI: 10.1002/cssc.201700792

Preprint 31 p, 2.8 MB

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