Asymmetric Supercapacitors Based on Reduced Graphene Oxide with Different Polyoxometalates as Positive and Negative Electrodes

ChemSusChem
Deepak P DubalPedro 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 ).

References

Feb 24, 2004·Frontiers in Bioscience : a Journal and Virtual Library·Nieves Casañ-Pastor, Pedro Gómez-Romero
Aug 2, 2008·Science·John R Miller, Patrice Simon
Jul 23, 2011·Chemical Society Reviews·Guoping WangJiujun Zhang
Mar 15, 2014·Science·Patrice SimonBruce Dunn
Apr 17, 2014·Journal of the American Chemical Society·Yang YangJames M Tour
Aug 29, 2014·Physical Chemistry Chemical Physics : PCCP·Jullieth Suárez-GuevaraPedro Gómez-Romero
Jan 28, 2015·Chemical Society Reviews·D P DubalP Gómez-Romero

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Citations

Feb 6, 2018·Chemical Society Reviews·Deepak P DubalPedro Gomez-Romero
Feb 23, 2018·Chemical Record : an Official Publication of the Chemical Society of Japan ... [et Al.]·Deepak P DubalPedro Gomez-Romero
Jul 16, 2020·Advanced Materials·Pranay RanjanAjayan Vinu
Nov 15, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Zhong Jie ZhangXiang Ying Chen
Apr 29, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Ning LiuYi Wang
Dec 5, 2020·Advanced Materials·Kolleboyina JayaramuluRoland A Fischer

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