Hybrid graphene-polyoxometalates nanofluids as liquid electrodes for dual energy storage in novel flow cells
Dubal, Deepak P. (Institut Català de Nanociència i Nanotecnologia)
Rueda García, Daniel (Institut Català de Nanociència i Nanotecnologia)
Marchante, Carlos (Institut Català de Nanociència i Nanotecnologia)
Benages Vilau, Raúl (Institut Català de Nanociència i Nanotecnologia)
Gómez Romero, Pedro (Institut Català de Nanociència i Nanotecnologia)

Data:	2018
Resum:	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.
Nota:	Número d'acord de subvenció MINECO/MAT2015-68394-R
Nota:	Número d'acord de subvenció MINECO/SEV-2013-0295
Nota:	Número d'acord de subvenció AGAUR/2017/SGR-870
Drets:	Tots els drets reservats.
Llengua:	Anglès.
Document:	article ; recerca ; submittedVersion
Matèria:	Electroactive Nanofluids ; Reduced Graphene Oxide (RGO) ; Polyoxometalates ; Hybrid materials
Publicat a:	Chemical record, Vol. 18, issue 7-8 (July 2018) , p. 1076-1084, ISSN 1528-0691

DOI: 10.1002/tcr.201700116

Preprint 35 p, 2.6 MB

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