Hybrid Graphene-Polyoxometalates Nanofluids as Liquid Electrodes for Dual Energy Storage in Novel Flow Cells

Chemical Record : an Official Publication of the Chemical Society of Japan ... [et Al.]
Deepak P DubalPedro Gomez-Romero

Abstract

Solid Hybrid materials abound. But flowing versions of them are new actors in the materials science landscape and in particular for energy applications. This paper presents a new way to deliver nanostructured hybrid materials for energy storage, namely, in the form of nanofluids. We present here the first example of a hybrid electroactive nanofluid (HENFs) combining capacitive and faradaic energy storage mechanisms in a single fluid material. This liquid electrode is composed of reduced graphene oxide and polyoxometalates (rGO-POMs) forming a stable nanocomposite for electrochemical energy storage in novel Nanofluid Flow Cells. Two graphene based hybrid materials (rGO-phosphomolybdate, rGO-PMo12 and rGO-phosphotungstate, rGO-PW12 ) were synthesized and dispersed with the aid of a surfactant in 1 M H2 SO4 aqueous electrolyte to yield highly stable hybrid electroactive nanofluids (HENFs) of low viscosity which were tested in a home-made flow cell under static and continuous flowing conditions. Remarkably, even low concentration rGO-POMs HENFs (0.025 wt%) exhibited high specific capacitances of 273 F/g(rGO-PW12 ) and 305 F/g(rGO-PMo12 ) with high specific energy and specific power. Moreover, rGO-POM HENFs show excellent cycling st...Continue Reading

References

Feb 13, 2004·Gut·M Romero-GómezM F González-Escribano
Mar 11, 2010·Advanced Materials·Eduardo Ruiz-HitzkyKatsuhiko Ariga
Dec 15, 2010·Chemical Society Reviews·Eduardo Ruiz-HitzkyMakoto Ogawa
Jan 11, 2011·Chemical Society Reviews·Laurence Rozes, Clément Sanchez
Jan 14, 2011·Chemical Society Reviews·Clément SanchezLionel Nicole
Mar 22, 2012·Accounts of Chemical Research·Katsuhiko NaoiTakeo Kamino
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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