TiO2 (B)/activated carbon non-aqueous hybrid system for energy storage

Brousse, Thierry; Marchand, R.; Taberna, Pierre‐Louis; Simon, Patrice

doi:10.1016/j.jpowsour.2005.09.020

Cited by 133 publications

(86 citation statements)

References 27 publications

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“…This new class of hybrid supercapacitors is continuously improving and blurring the boundaries between batteries and supercapacitors [23]. It is worth mentioning that it is also achieved by merging redox chemistry, either by combining conventional batteries and supercapacitor electrodes in a single device equivalent to a series combination (known as supercapabatteries) [24,25] or by integrating redox active materials (conducting polymers, transition metal oxides, mesoporous semiconducting oxides, etc.) typical of batteries and supercapacitive elements in the same electrode (equivalent to a parallel combination) [6,[26][27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Functionalized Graphene–Polyoxometalate Nanodots Assembly as “Organic–Inorganic” Hybrid Supercapacitors and Insights into Electrode/Electrolyte Interfacial Processes

Gupta

Aberg

Carrizosa

2017

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Abstract:The stable high-performance electrochemical electrodes consisting of supercapacitive reduced graphene oxide (rGO) nanosheets decorated with pseudocapacitive polyoxometalates (phosphomolybdate acid-H 3 PMo 12 O 40 (POM) and phosphotungstic acid-H 3 PW 12 O 40 (POW)) nanodots/nanoclusters are hydrothermally synthesized. The interactions between rGO and POM (and POW) components create emergent "organic-inorganic" hybrids with desirable physicochemical properties (specific surface area, mechanical strength, diffusion, facile electron and ion transport) enabled by molecularly bridged (covalently and electrostatically) tailored interfaces for electrical energy storage. The synergistic hybridization between two electrochemical energy storage mechanisms, electrochemical double-layer from rGO and redox activity (faradaic) of nanoscale POM (and POW) nanodots, and the superior operating voltage due to high overpotential yielded converge yielding a significantly improved electrochemical performance. They include increase in specific capacitance from 70 F·g −1 for rGO to 350 F·g −1 for hybrid material with aqueous electrolyte (0.4 M sodium sulfate), higher current carrying capacity (>10 A·g −1 ) and excellent retention (94%) resulting higher specific energy and specific power density. We performed scanning electrochemical microscopy to gain insights into physicochemical processes and quantitatively determine associated parameters (diffusion coefficient (D) and heterogeneous electron transfer rate (k ET )) at electrode/electrolyte interface besides mapping electrochemical (re)activity and electro-active site distribution. The experimental findings are attributed to: (1) mesoporous network and topologically multiplexed conductive pathways; (2) higher density of graphene edge plane sites; and (3) localized pockets of re-hybridized orbital engineered modulated band structure provided by polyoxometalates anchored chemically on functionalized graphene nanosheets, contribute toward higher interfacial charge transfer, rapid ion conduction, enhanced storage capacity and improved electroactivity.

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Section: Introductionmentioning

confidence: 99%

Functionalized Graphene–Polyoxometalate Nanodots Assembly as “Organic–Inorganic” Hybrid Supercapacitors and Insights into Electrode/Electrolyte Interfacial Processes

Gupta

Aberg

Carrizosa

2017

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“…The normal Li/Na-ion capacitors use an intercalation-type negative electrode (anode) and an electric double layer-type positive electrode (cathode). Various materials have been paired for this purpose, for instance V 2 O 5 /carbon nanotubes(−)//activated carbon(+) [1], Li 4 Ti 5 O 12 (−)//graphene(+) [2], nanotubular TiO 2 (−)//mesoporous carbon(+) [3], TiO 2 (B)(−)//activated carbon(+) [4]. All-carbon Li/Na-ion capacitors are a relatively new concept, where the graphitic materials, including graphene and biomass carbons, are used for the anode intercalation storage [5,6].…”

Section: Introductionmentioning

confidence: 99%

High-capacity pseudocapacitive Li storage on functional nanoporous carbons with parallel mesopores

Zeng

Wang

2016

Energy Storage Materials

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. conductivity and enhanced surface redox activity endows the functionalized carbon cathode with high capacity (313 mA h/g@50 mA/g), good stability (>200 cycles) and high rate capability (148 mA h/g@400 mA/g).

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“…10,[12][13][14][15][16] Poor cycleability in non-aqueous media results in the case of EDLC capacitors irrespective of carbon allotropes used. 7,8 Among the various forms of carbon, graphene is found to be a more attractive candidate to study the supercapacitive behaviour in nonaqueous media, however no extensive work has yet been carried out in such medium.…”

Section: -2mentioning

confidence: 99%

Non-aqueous energy storage devices using graphene nanosheets synthesized by green route

et al. 2013

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In this paper we report the use of triethylene glycol reduced graphene oxide (TRGO) as an electrode material for non-aqueous energy storage devices such as supercapacitors and Li-ion batteries. TRGO based non–aqueous symmetric supercapacitor is constructed and shown to deliver maximum energy and power densities of 60.4 Wh kg–1 and 0.15 kW kg–1, respectively. More importantly, symmetric supercapacitor shows an extraordinary cycleability (5000 cycles) with over 80% of capacitance retention. In addition, Li-storage properties of TRGO are also evaluated in half-cell configuration (Li/TRGO) and shown to deliver a reversible capacity of ∼705 mAh g–1 with good cycleability at constant current density of 37 mA g–1. This result clearly suggests that green-synthesized graphene can be effectively used as a prospective electrode material for non-aqueous energy storage systems such as Li-ion batteries and supercapacitors

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TiO2 (B)/activated carbon non-aqueous hybrid system for energy storage

Cited by 133 publications

References 27 publications

Functionalized Graphene–Polyoxometalate Nanodots Assembly as “Organic–Inorganic” Hybrid Supercapacitors and Insights into Electrode/Electrolyte Interfacial Processes

Functionalized Graphene–Polyoxometalate Nanodots Assembly as “Organic–Inorganic” Hybrid Supercapacitors and Insights into Electrode/Electrolyte Interfacial Processes

High-capacity pseudocapacitive Li storage on functional nanoporous carbons with parallel mesopores

Non-aqueous energy storage devices using graphene nanosheets synthesized by green route

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