A Polypyrrole/Phosphomolybdic Acid∣Poly(3,4-ethylenedioxythiophene)/Phosphotungstic Acid Asymmetric Supercapacitor

Suppes, Graeme M.; Cameron, Colin G.; Freund, Michael S.

doi:10.1149/1.3464802

Cited by 81 publications

(44 citation statements)

References 39 publications

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“…Furthermore, even at ah igherp ower density (232 mW cm À3 ;6 583 Wkg À1 )t he asymmetric cell shows an energy density of 0.5 mWh cm À3 (15.63 Wh kg À1 ), suggesting excellent electrochemical features of the PMo 12 k rGO-PW 12 asymmetricS C. These values are considerably highert han those of symmetric and asymmetric cells of POMs-based supercapacitors. [12,13,31,32,26] For instance, Suppes et al [26] assembled ap olypyrrole/phosphomolybdic acid k poly(3,4-ethylenedioxythiophene)/phosphotungstic acid (PPy/PMo 12 k PEDOT/PW 12 ) asymmetricc ell and reported as pecific energy of 4Whkg À (at as pecific powerof1 03 Wkg À1 ).…”

Section: Resultsmentioning

confidence: 99%

Asymmetric Supercapacitors Based on Reduced Graphene Oxide with Different Polyoxometalates as Positive and Negative Electrodes

et al. 2017

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Nanofabrication using a "bottom-up" approach of hybrid electrode materials into a well-defined architecture is essential for next-generation miniaturized energy storage devices. This paper describes the design and fabrication of reduced graphene oxide (rGO)/polyoxometalate (POM)-based hybrid electrode materials and their successful exploitation for asymmetric supercapacitors. First, redox active nanoclusters of POMs [phosphomolybdic acid (PMo ) and phosphotungstic acid (PW )] were uniformly decorated on the surface of rGO nanosheets to take full advantage of both charge-storing mechanisms (faradaic from POMs and electric double layer from rGO). The as-synthesized rGO-PMo and rGO-PW hybrid electrodes exhibited impressive electrochemical performances with specific capacitances of 299 (269 mF cm ) and 370 F g (369 mF cm ) in 1 m H SO as electrolyte at 5 mA cm . An asymmetric supercapacitor was then fabricated using rGO-PMo as the positive and rGO-PW as the negative electrode. This rGO-PMo ∥rGO-PW asymmetric cell could be successfully cycled in a wide voltage window up to 1.6 V and hence exhibited an excellent energy density of 39 Wh kg (1.3 mWh cm ) at a power density of 658 W kg (23 mW cm ).

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Section: Resultsmentioning

confidence: 99%

Asymmetric Supercapacitors Based on Reduced Graphene Oxide with Different Polyoxometalates as Positive and Negative Electrodes

et al. 2017

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“…Most of the POMs we investigated (see Table 1) are of the Keggin type, [XV n Mo 12−n O 40 ] m− (X = P or Si; n = 0-3), and they are electrochemically active and stable in the acidic, aqueous electrolytes used here. 1,25,28,29,[31][32][33][39][40][41] So far two methods have been utilized to prepare POM/ carbon hybrid materials for SCs: sonication and layer-by-layer (LbL) deposition. 1,25,[29][30][31] Ruiz et al prepared an AC/PMo 12 hybrid material by sonicating a POM solution with AC powder, which led to adsorption of the POM onto the surface of AC.…”

Section: Introductionmentioning

confidence: 99%

A novel SWCNT-polyoxometalate nanohybrid material as an electrode for electrochemical supercapacitors

et al. 2015

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A novel nanohybrid material that combines single-walled carbon nanotubes (SWCNTs) with a polyoxometalate (TBA)5[PVMoO40] (TBA-PV2Mo10, TBA: [(CH3(CH2)3)4N](+), tetra-n-butyl ammonium) is investigated for the first time as an electrode material for supercapacitors (SCs) in this study. The SWCNT-TBA-PV2Mo10 material has been prepared by a simple solution method which electrostatically attaches anionic [PV2Mo10O40](5-) anions with organic TBA cations on the SWCNTs. The electrochemical performance of SWCNT-TBA-PV2Mo10 electrodes is studied in an acidic aqueous electrolyte (1 M H2SO4) by galvanostatic charge/discharge and cyclic voltammetry. In this SWCNT-TBA-PV2Mo10 nanohybrid material, TBA-PV2Mo10 provides redox activity while benefiting from the high electrical conductivity and high double-layer capacitance of the SWCNTs that improve both energy and power density. An assembled SWCNT-TBA-PV2Mo10 symmetric SC exhibits a 39% higher specific capacitance as compared to a symmetric SC employing only SWCNTs as electrode materials. Furthermore, the SWCNT-TBA-PV2Mo10 SC exhibits excellent cycling stability, retaining 95% of its specific capacitance after 6500 cycles.

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“…The values reported here are significantly highert han those for othere lectrodes and cell configurations. [39][40][41][42][43] As ummary of supercapacitive values for POMs and other electrodes are presentedi nF igure S6 in the Supporting Information. Figure 7b and cp resents the volumetric and gravimetric Ragone plots for PW 12 @PPy and PMo 12 @PPy symmetric cells.…”

Section: Resultsmentioning

confidence: 99%

“…The volumetric energy density reported here is the highest value for PPy-baseds upercapacitors until now. [41,[44][45][46][47][48][49] The excellent performance can be attributedt ot he homogeneously anchored POM nanoparticleso nto the 1D hollow PPy-NPipes as well as to the unique cell design coupling two-charge storingm echanismsi nas ingle electrode and in as ingle device.…”

Section: Resultsmentioning

confidence: 99%

Functionalization of Polypyrrole Nanopipes with Redox‐Active Polyoxometalates for High Energy Density Supercapacitors

et al. 2017

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Hybrid materials are very attractive for the fabrication of high‐performance supercapacitors. Here, we have explored organic–inorganic hybrid materials based on open‐end porous 1 D polypyrrole nanopipes (PPy‐NPipes) and heteropolyoxometalates (phosphotungstate ([PW12O40]3−, PW12) or phosphomolybdate ([PMo12O40]3−, PMo12)) that display excellent areal capacitances. Two different hybrid materials (PMo12@PPy and PW12@PPy) were effectively synthesized and used for symmetric supercapacitors. The anchoring of the inorganic nanoclusters onto the conducting polymer nanopipes led to electrodes that stood up to our best expectations exhibiting outstanding areal capacitances that are almost 1.5 to 2 fold higher than that of pristine PPy‐NPipes. In addition, symmetric cells based on PMo12@PPy and PW12@PPy hybrid electrodes were fabricated and showed significant improvement in cell performance with very high volumetric capacitances in the range of 6.3–6.8 F cm−3 (considering the volume of whole device). Indeed, they provide extended potential windows in acidic electrolytes (up to 1.5 V) which led to ultrahigh energy densities of 1.5 and 2.2 mWh cm−3 for PMo12@PPy and PW12@PPy cells, respectively. Thus, these unique organic‐inorganic hybrid symmetric cells displayed extraordinary electrochemical performances far exceeding those of more complex asymmetric systems.

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A Polypyrrole/Phosphomolybdic Acid∣Poly(3,4-ethylenedioxythiophene)/Phosphotungstic Acid Asymmetric Supercapacitor

Cited by 81 publications

References 39 publications

Asymmetric Supercapacitors Based on Reduced Graphene Oxide with Different Polyoxometalates as Positive and Negative Electrodes

Asymmetric Supercapacitors Based on Reduced Graphene Oxide with Different Polyoxometalates as Positive and Negative Electrodes

A novel SWCNT-polyoxometalate nanohybrid material as an electrode for electrochemical supercapacitors

Functionalization of Polypyrrole Nanopipes with Redox‐Active Polyoxometalates for High Energy Density Supercapacitors

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