Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/112237
Citations | ||
Scopus | Web of Science® | Altmetric |
---|---|---|
?
|
?
|
Type: | Journal article |
Title: | Asymmetric supercapacitors based on reduced graphene oxide with different polyoxometalates as positive and negative electrodes |
Author: | Dubal, D. Chodankar, N. Vinu, A. Kim, D. Gomez-Romero, P. |
Citation: | ChemSusChem: chemistry and sustainability, energy and materials, 2017; 10(13):2742-2750 |
Publisher: | Wiley |
Issue Date: | 2017 |
ISSN: | 1864-5631 1864-564X |
Statement of Responsibility: | 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 |
DOI: | 10.1002/cssc.201700792 |
Published version: | http://dx.doi.org/10.1002/cssc.201700792 |
Appears in Collections: | Aurora harvest 3 Chemical Engineering publications |
Files in This Item:
There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.