Charge storage in binder-free 2D-hexagonal CoMoO4 nanosheets as a redox active material for pseudocapacitors

The high Faradic redox active material of Cu7S4-NWs coated on a carbon fiber fabric is directly used as a binder-free electrode for a high performance flexible solid state supercapacitor.

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Charge storage in KCu7S4 as redox active material for a flexible all-solid-state supercapacitor

Nano Energy ◽

10.1016/j.nanoen.2015.11.025 ◽

2016 ◽

Vol 19 ◽

pp. 363-372 ◽

Cited By ~ 48

Author(s):

Shuge Dai ◽

Weina Xu ◽

Yi Xi ◽

Mingjun Wang ◽

Xiao Gu ◽

...

Keyword(s):

Solid State ◽

Active Material ◽

Charge Storage ◽

Redox Active

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A Nonaqueous Redox-Matched Flow Battery with Charge Storage in Insoluble Polymer Beads

10.26434/chemrxiv-2021-mf70j ◽

2021 ◽

Author(s):

Dukhan Kim ◽

Melanie Sanford ◽

Thomas Vaid ◽

Anne McNeil

Keyword(s):

Active Material ◽

High Energy ◽

High Energy Density ◽

Charge Storage ◽

Redox Potentials ◽

Polymer Beads ◽

Flow Battery ◽

Redox Active ◽

Merrifield Resin ◽

Insoluble Polymer

We describe the nonaqueous redox-matched flow battery (RMFB), where charge is stored on redox-active moieties covalently tethered to non-circulating, insoluble polymer beads and charge is transferred between the electrodes and the beads via soluble mediators with redox potentials matched to the active moieties on the beads. The RMFB reported herein uses ferrocene and viologen derivatives bound to crosslinked polystyrene beads. Charge storage in the beads leads to a high (approximately 1.0-1.7 M) effective concentration of active material in the reservoirs while preventing crossover of that material. The relatively low concentration of soluble mediators (15 mM) eliminates the need for high-solubility molecules to create high energy density batteries. Nernstian redox exchange between the beads and redox-matched mediators was fast relative to the cycle time of the RMFB. This approach is generalizable to many different redox-active moieties via attachment to the versatile Merrifield resin.

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Theoretical Exploration of 2,2’-Bipyridines as Electro-Active Compounds in Flow Batteries

10.26434/chemrxiv.7995935.v2 ◽

2019 ◽

Author(s):

Mariano Sánchez-Castellanos ◽

Martha M. Flores-Leonar ◽

Zaahel Mata-Pinzón ◽

Humberto G. Laguna ◽

Karl García-Ruiz ◽

...

Keyword(s):

Redox Potential ◽

Active Material ◽

Chemical Properties ◽

Small Subset ◽

Solubility In Water ◽

Protonation Reaction ◽

Redox Active ◽

Physico Chemical ◽

Pka Value ◽

Flow Batteries

Compounds from the 2,2’-bipyridine molecular family were investigated for use as redox-active materials in organic flow batteries. For 156 2,2’-bipyridine derivatives reported in the academic literature, we calculated the redox potential, the pKa for the first protonation reaction, and the solubility in aqueous solutions. Using experimental data on a small subset of derivatives, we were able to calibrate our calculations. We find that functionalization with electron-withdrawing groups leads to an increase of the redox potential and to an increase of the molecular acidity (as expressed in a reduction of the pKa value for the first protonation step). Furthermore, calculations of solubility in water indicate that some of the studied derivatives have adequate solubility for flow battery applications. Based on an analysis of the physico-chemical properties of the 156 studied compounds, we down-select five molecules with carbonyl- and nitro-based functional groups, whose parameters are especially promising for potential application as negative redox-active material inorganic flow batteries.

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Theoretical Exploration of 2,2’-Bipyridines as Electro-Active Compounds in Flow Batteries

10.26434/chemrxiv.7995935 ◽

2019 ◽

Author(s):

Mariano Sánchez-Castellanos ◽

Martha M. Flores-Leonar ◽

Zaahel Mata-Pinzón ◽

Humberto G. Laguna ◽

Karl García-Ruiz ◽

...

Keyword(s):

Redox Potential ◽

Active Material ◽

Chemical Properties ◽

Small Subset ◽

Solubility In Water ◽

Protonation Reaction ◽

Redox Active ◽

Physico Chemical ◽

Pka Value ◽

Flow Batteries

Compounds from the 2,2’-bipyridine molecular family were investigated for use as redox-active materials in organic flow batteries. For 156 2,2’-bipyridine derivatives reported in the academic literature, we calculated the redox potential, the pKa for the first protonation reaction, and the solubility in aqueous solutions. Using experimental data on a small subset of derivatives, we were able to calibrate our calculations. We find that functionalization with electron-withdrawing groups leads to an increase of the redox potential and to an increase of the molecular acidity (as expressed in a reduction of the pKa value for the first protonation step). Furthermore, calculations of solubility in water indicate that some of the studied derivatives have adequate solubility for flow battery applications. Based on an analysis of the physico-chemical properties of the 156 studied compounds, we down-select five molecules with carbonyl- and nitro-based functional groups, whose parameters are especially promising for potential application as negative redox-active material inorganic flow batteries.

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Ionic Charge Storage in Diketopyrrolopyrrole-Based Redox-Active Conjugated Polymers

The Journal of Physical Chemistry C ◽

10.1021/acs.jpcc.0c11635 ◽

2021 ◽

Vol 125 (8) ◽

pp. 4449-4457

Author(s):

Jibin J. Samuel ◽

Varun Kumar Karrothu ◽

Ram Kumar Canjeevaram Balasubramanyam ◽

Aiswarya Abhisek Mohapatra ◽

Chandrasekhar Gangadharappa ◽

...

Keyword(s):

Conjugated Polymers ◽

Charge Storage ◽

Ionic Charge ◽

Redox Active

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Optical, electrochemical and photocatalytic properties of cobalt doped CsPbCl3 nanostructures: a one-pot synthesis approach

Scientific Reports ◽

10.1038/s41598-021-95088-2 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Aadil Ahmad Bhat ◽

Shakeel Ahmad Khandy ◽

Ishtihadah Islam ◽

Radha Tomar

Keyword(s):

Optical Properties ◽

Visible Light ◽

Active Material ◽

Blue Emission ◽

Structural Features ◽

Ion Concentration ◽

Photocatalytic Properties ◽

Charge Storage ◽

Cobalt Doping ◽

One Pot

AbstractThe present manuscript aims at the synthesis of cesium based halide perovskite nanostructures and the effect of cobalt doping on the structural, optical, lumnisent, charge storage and photocatalytic properties. In a very first attempt, we report the solvothermal synthesis of Co doped CsPbCl3 nanostructures under subcritical conditions. The structural features were demonstrated by X-ray diffraction (XRD) Surface morphology determined cubic shape of the synthesized particles. Doping is an excellent way to modify the properties of host material in particular to the electronic structure or optical properties. Incorporation of Co2+ ions in the perovskite structure tunes the optical properties of the nanostructures making this perovskite a visible light active material (Eg = 1.6 eV). This modification in the optical behaviour is the result of size effect, the crystallite size of the doped nanostructures increases with cobalt doping concentration. Photolumniscance (PL) study indicated that CsPbCl3 exhibited Blue emission. Thermogravametric analysis (TGA) revealed that the nanostructures are quite stable at elavated temperatures. The electrochemical performance depicts the pseudocapacative nature of the synthesized nanostructures and can used for charge storage devices. The charge storage capability showed direct proportionality with cobalt ion concentration. And Finally the photocatalytic performance of synthesized material shows superior catalytic ability degrading 90% of methylene blue (MB) dye in 180 min under visible light conditions.

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3D Alumina-Graphene Hybrid Nanofibers as a Binder‐Free Cathode for Rechargeable Li‐S Batteries

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.799.191 ◽

2019 ◽

Vol 799 ◽

pp. 191-196

Author(s):

Masoud Taleb ◽

Roman Ivanov ◽

Irina Hussainova

Keyword(s):

Energy Density ◽

Active Material ◽

High Energy ◽

High Energy Density ◽

Storage Device ◽

Rechargeable Lithium Batteries ◽

Alumina Nanofibers ◽

Electrochemically Active ◽

Binder Free ◽

Li Ion

Lithium-sulfur (Li-S) batteries are promising as a next generation energy-storage device because their energy density is higher than that of current Li-ion devices. Alumina nanofibers coated with graphene is electrochemically active material with tunable graphene flakes and surface area. Combination of this material with sulfur leads to an improved initial discharge capacity and cycle stability, probably due to improved electrical and ionic transport during electrochemical reactions. Based on this understanding, the resulting graphene sulfur composite showed high and stable specific capacities up to ∼900 mAh/g after 50 cycles, representing a promising cathode material for rechargeable lithium batteries with high energy density.

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