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

Chemical Record - Tập 18 Số 7-8 - Trang 1076-1084 - 2018
Deepak P. Dubal1,2, Daniel Rueda-García1, Carlos Marchante1, Raúl Benages‐Vilau1, Pedro Gómez‐Romero1,3
1Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and the Barcelona Institute of Science and Technology, Campus UAB, Bellaterra 08193, Barcelona, Spain
2School of Chemical Engineering, Faculty of Engineering, Computer and Mathematical Sciences University of Adelaide Australia
3Consejo Superior de Investigaciones Científicas (CSIC), Spain

Tóm tắt

AbstractSolid 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.

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Chemical Record

Tập 18 Số 7-8

1076-1084

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