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|Title:||Asymmetric supercapacitors based on reduced graphene oxide with different polyoxometalates as positive and negative electrodes|
|Citation:||ChemSusChem, 2017; 10(13):2742-2750|
|Deepak P. Dubal, Nilesh R. Chodankar, Ajayan Vinu, Do‐Heyoung Kim, Pedro Gomez‐Romero|
|Abstract:||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 (PMo12 ) and phosphotungstic acid (PW12 )] 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-PMo12 and rGO-PW12 hybrid electrodes exhibited impressive electrochemical performances with specific capacitances of 299 (269 mF cm-2 ) and 370 F g-1 (369 mF cm-2 ) in 1 m H2 SO4 as electrolyte at 5 mA cm-2 . An asymmetric supercapacitor was then fabricated using rGO-PMo12 as the positive and rGO-PW12 as the negative electrode. This rGO-PMo12 ∥rGO-PW12 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 (1.3 mWh cm-3 ) at a power density of 658 W kg-1 (23 mW cm-3 ).|
|Keywords:||asymmetric supercapacitors; carbon; hybrid materials; polyoxometalates; reduced graphene oxide|
|Rights:||© 2017 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim|
|Appears in Collections:||Chemical Engineering publications|
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