Journal
CHEMICAL RECORD
Volume 18, Issue 7-8, Pages 1076-1084Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/tcr.201700116
Keywords
Electroactive Nanofluids; Reduced Graphene Oxide (RGO); Polyoxometalates; Hybrid materials
Categories
Funding
- MINECO-FEDER [MAT2015-68394-R]
- AGAUR [2017 SGR 870]
- Secretary for Universities and Research of the Ministry of Economy and Knowledge of the Government of Catalonia
- Co-fund programme of the Marie Curie Actions of the 7th R&D Framework Programme of the European Union
- Severo Ochoa Program (MINECO) [SEV-2013-0295]
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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 1M 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 (0.025wt%) exhibited high specific capacitances of 273F/g(rGO-PW12) and 305F/g(rGO-PMo12) with high specific energy and specific power. Moreover, rGO-POM HENFs show excellent cycling stability (approximate to 95%) as well as Coulombic efficiency (approximate to 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.
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