Towards an all-vanadium redox-flow battery electrolyte: electrooxidation of V(III) in V(IV)/V(III) redox couple

Roznyatovskaya, Nataliya; Noack, Jens; Fühl, Matthias; Pinkwart, Karsten; Tübke, Jens

doi:10.1016/j.electacta.2016.06.073

Cited by 15 publications

(8 citation statements)

References 23 publications

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“…A study of the V 3+ -ion reduction at a platinum electrode using a rotating disc electrode and impedance measurements yielded no conclusive results [204]. The V(III)/V(IV) redox couple has been studied at a glassy carbon with respect to its importance during initial pre-charging of electrolytes in a VRFB [205]. The surprisingly low apparent symmetry factor at large overpotentials for the V(V) reduction has been examined in detail [206].…”

Section: Catalysis Catalysts and Electrode Materialsmentioning

confidence: 99%

Electrocatalysis at Electrodes for Vanadium Redox Flow Batteries

Holze

2018

Batteries

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Flow batteries (also: redox batteries or redox flow batteries RFB) are briefly introduced as systems for conversion and storage of electrical energy into chemical energy and back. Their place in the wide range of systems and processes for energy conversion and storage is outlined. Acceleration of electrochemical charge transfer for vanadium-based redox systems desired for improved performance efficiency of these systems is reviewed in detail; relevant data pertaining to other redox systems are added when possibly meriting attention. An attempt is made to separate effects simply caused by enlarged electrochemically active surface area and true (specific) electrocatalytic activity. Because this requires proper definition of the experimental setup and careful examination of experimental results, electrochemical methods employed in the reviewed studies are described first.

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Section: Catalysis Catalysts and Electrode Materialsmentioning

confidence: 99%

Electrocatalysis at Electrodes for Vanadium Redox Flow Batteries

Holze

2018

Batteries

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“…The cyclic voltammograms for V(III) and V(IV) electrolyte samples are usually characterized by quasi-reversible V(V)/V(IV) and V(III)/V(II) redox transitions [22,23]. Typical cyclic voltammograms for V(III) and V(IV) electrolyte samples at an oxidatively pre-treated glassy carbon electrode are presented in Figure 2.…”

Section: Cyclic Voltammetrymentioning

confidence: 99%

Vanadium Electrolyte for All-Vanadium Redox-Flow Batteries: The Effect of the Counter Ion

et al. 2019

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In this study, 1.6 M vanadium electrolytes in the oxidation forms V(III) and V(V) were prepared from V(IV) in sulfuric (4.7 M total sulphate), V(IV) in hydrochloric (6.1 M total chloride) acids, as well as from 1:1 mol mixture of V(III) and V(IV) (denoted as V3.5+) in hydrochloric (7.6 M total chloride) acid. These electrolyte solutions were investigated in terms of performance in vanadium redox flow battery (VRFB). The half-wave potentials of the V(III)/V(II) and V(V)/V(IV) couples, determined by cyclic voltammetry, and the electronic spectra of V(III) and V(IV) electrolyte samples, are discussed to reveal the effect of electrolyte matrix on charge-discharge behavior of a 40 cm2 cell operated with 1.6 M V3.5+ electrolytes in sulfuric and hydrochloric acids. Provided that the total vanadium concentration and the conductivity of electrolytes are comparable for both acids, respective energy efficiencies of 77% and 72–75% were attained at a current density of 50 mA∙cm−2. All electrolytes in the oxidation state V(V) were examined for chemical stability at room temperature and +45 °C by titrimetric determination of the molar ratio V(V):V(IV) and total vanadium concentration.

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“…[9][10][11] Hence, precise detection of these gases sensors, as well as humidity sensors, 12 is very important, especially for environment, industry, and people's health. [13][14][15][16][17][18] A lot of attention is devoted to polyaniline (PANi), one of the most promising conducting polymers, candidate for application of gas and humidity sensing, due to its properties such as unique conductivity and chemical stability in the environment. 14,[19][20][21][22][23][24][25][26] However, the PANi is intractable, infusible, and insoluble, and these inconveniences hamper greatly the processing and applications of the polymer.…”

Section: Introductionmentioning

confidence: 99%

Self‐doped N‐propansulfonic acid polyaniline‐polyethylene terephthalate film used as active sensor element for humidity or gas detection

Solonaru¹,

Grigoraş²,

Petrila

et al. 2019

J of Applied Polymer Sci

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In this work, we report the fabrication of sensors’ element for humidity or gases, prepared by in situ polymerization of aniline N‐propansulfonic acid using ammonium persulfate in acidic medium. The polymer is being used in the form of powder or deposited in multiple layers onto the PET film. Various techniques including Fourier Transform infrared (FTIR), ultraviolet‐–visible spectroscopy (UV–vis), X‐ray diffraction (XRD) and scanning electron microscopy (SEM) were employed to characterize the as‐prepared sensing materials. The film has been tested for humidity influence, where the significant variations in electrical characteristics were observed, suggesting its usefulness for humidity sensors. Also, for different organic and inorganic gases, a relatively low operating temperature and important sensitivity were observed that indicate its applicability as an active element for general gases sensors. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47743.

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Towards an all-vanadium redox-flow battery electrolyte: electrooxidation of V(III) in V(IV)/V(III) redox couple

Cited by 15 publications

References 23 publications

Electrocatalysis at Electrodes for Vanadium Redox Flow Batteries

Electrocatalysis at Electrodes for Vanadium Redox Flow Batteries

Vanadium Electrolyte for All-Vanadium Redox-Flow Batteries: The Effect of the Counter Ion

Self‐doped N‐propansulfonic acid polyaniline‐polyethylene terephthalate film used as active sensor element for humidity or gas detection

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