Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/121390
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Type: Journal article
Title: Hybrid graphene-polyoxometalates nanofluids as liquid electrodes for dual energy storage in novel flow cells
Author: Dubal, D.
Rueda-Garcia, D.
Marchante, C.
Benages, R.
Gomez-Romero, P.
Citation: The Chemical Record, 2018; 18(7-8):1076-1084
Publisher: Wiley
Issue Date: 2018
ISSN: 1527-8999
1528-0691
Statement of
Responsibility: 
Deepak P. Dubal, Daniel Rueda-Garcia, Carlos Marchante, Raul Benages, and Pedro 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 H₂SO₄ 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 stability (∼95 %) as well as Coulombic efficiency (∼77-79 %) after 2000 cycles. Thus, rGO-POM HENFs effectively behave as real liquid electrodes with excellent properties, demonstrating the possible future application of HENFs for dual energy storage in a new generation of Nanofluid Flow Cells.
Keywords: Electroactive nanofluids; reduced graphene oxide (RGO); polyoxometalates; hybrid materials
Rights: © 2018 The Chemical Society of Japan & Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
DOI: 10.1002/tcr.201700116
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Chemical Engineering publications

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