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Título: | Hybrid graphene‐polyoxometalates nanofluids as liquid electrodes for dual energy storage in novel flow cells |
Autor: | Dubal, Deepak P. CSIC ORCID; Rueda-García, Daniel CSIC ORCID; Marchante, Carlos CSIC; Benages‑Vilau, Raúl CSIC ORCID; Gómez-Romero, P. CSIC ORCID | Palabras clave: | Electroactive nanofluids Reduced Graphene Oxide (RGO) Polyoxometalates Hybrid materials |
Fecha de publicación: | 2018 | Editor: | Wiley-VCH | Citación: | Chemical Record 18(7-8): 1076-1084 (2018) | Resumen: | 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. | Versión del editor: | https://doi.org/10.1002/tcr.201700116 | URI: | http://hdl.handle.net/10261/199448 | DOI: | 10.1002/tcr.201700116 | ISSN: | 1527-8999 | E-ISSN: | 1528-0691 |
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