Electrochemical studies of vanadium(III) and vanadium(IV) acetylacetonate complexes in dimethylsulfoxide

NAWI, M. A.; Riechel, Thomas L.

doi:10.1021/ic50221a006

Cited by 58 publications

(40 citation statements)

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“…The V(IV) → V(III) couple was observed as an irreversible voltammetric response in the potential range of −0.7 to −1.0 V vs SCE [46]. More detailed information was reported for phenanthroline and phenazine derivatives [45] (Table 1, entries [24][25][26][27].…”

Section: Complexes With Tridentate Ligandsmentioning

confidence: 99%

“…The electrochemistry of VOL 2 complexes, with L = bidentate monoanionic ligand, appeared to be strongly influenced by the nature of bonding atoms and the ring size (metal to bidentate ligand), as inferred by comparing potentials of VO(quinol) 2 , VO(etdtc) 2 , VO(acac) 2 , and VO(sesa) 2 in Table 1 ( [22,23,25,26], entries 1-4, structures and abbreviations in Chart 1, in alphabetical order of abbreviations). After Riechel's pioneering work, numerous bidentate ligands were used to prepare oxido-vanadium(IV) compounds.…”

Section: Complexes With Bidentate Ligandsmentioning

confidence: 99%

“…On the anodic side, two irreversible oxidation peaks were found, attributable to successive oxidations to V(IV) and V(V). Results are in Table 8 (entries [23][24][25][26][27].…”

Section: Dinuclear Compoundsmentioning

confidence: 99%

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A journey into the electrochemistry of vanadium compounds

Galloni

Conte

2015

Coordination Chemistry Reviews

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Section: Complexes With Tridentate Ligandsmentioning

confidence: 99%

Section: Complexes With Bidentate Ligandsmentioning

confidence: 99%

See 1 more Smart Citation

A journey into the electrochemistry of vanadium compounds

Galloni

Conte

2015

Coordination Chemistry Reviews

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“…47 The chemical degradation of V(acac) 3 to VO(acac) 2 in the positive electrolyte may have occurred due to the presence of trace amounts of water as reported in the literature. 10,42 In the RFB system, the possible sources of water are residual water content in the chemical reactants and solvent, water adsorbed on cell components (such as electrodes and/or membrane) and, also, the water vapor inside the N 2 -filled glove box (∼250 ppm). The proposed degradation reactions are presented in Table IV.…”

Section: Degradation Of the V(acac)mentioning

confidence: 99%

Performance of a Non-Aqueous Vanadium Acetylacetonate Prototype Redox Flow Battery: Examination of Separators and Capacity Decay

Escalante-García

Wainright

Thompson

et al. 2014

J. Electrochem. Soc.

128

119

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Non-aqueous electrolytes are stable over wide electrochemical potential windows, generally >2 V, and therefore hold promise for enabling higher energy and power density redox flow batteries (RFBs). Nevertheless, the development of non-aqueous RFBs is at an early stage and significant research efforts are needed to demonstrate non-aqueous RFBs with performance characteristics that exceed those of aqueous RFBs. The membrane or separator is a critical component that to a great extent determines the performance of RFB systems for practical applications. In this work, the performance of a RFB was evaluated with Nafion 1035 membranes and Daramic 175 SLI microporous separators. The non-aqueous electrolyte was based on vanadium (III) acetylacetonate. This chemistry possesses two couples over ∼2.2 V. Charge-discharge cycles were performed in a RFB at a current density of 10 mA cm −2 . Coulombic and energy efficiencies of 91% and 80% were achieved using the Nafion membrane. A similar RFB using the Daramic microporous separator achieved columbic and energy efficiencies of 73% and 68%, respectively. The source of capacity decay during multiple charge-discharge cycles was also investigated. The loss in the capacity was related to the poor chemical stability of the vanadium acetylacetonate in the positive electrolyte during battery cycling. Redox flow batteries (RFBs) have emerged as very attractive options for large-scale energy storage applications and, could facilitate the integration of renewable energy resources (e.g. wind and solar) with the current electricity grid.1,2 RFBs are electrochemical devices that store electrical energy in soluble electro-active species in a liquid electrolyte. The electro-active species are stored externally in separate reservoirs and are pumped through the battery stack during operation. The energy is stored or delivered by means of a redox reaction between the two species with different standard electrode potentials, separated by a membrane.2,3 Unlike conventional batteries, RFBs are more attractive for large scale energy storage because they offer more flexible operation, simple electrode reactions, longer cycle life, higher overall energy efficiencies and easier scale-up. 4 Nonetheless, RFB technology is still in an early stage; challenges that remain in the quest to produce devices with high power and energy density at low cost include the discovery or development of stable, high energy density redox electrolytes, and efficient and low cost membranes or separators. 1,5 Aqueous and non-aqueous chemistries are being investigated for use in RFBs. The cell potential of aqueous RFBs is limited to less than ∼1.6 V primarily due to the electrochemical stability of water at carbon/graphite electrodes.6 Non-aqueous solvents, on the other hand, exhibit wider electrochemical potential windows, offering the possibility for higher power and energy densities. Several non-aqueous electrolytes using metal-ligand complexes as the active-redox species in organic solvents have exhibited cell potentials ab...

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“…The most significant feature of the VO(IV) complex is it shows two well defined one-electron transfer redox peaks, corresponding to the formation of the VO(IV)/ VO(V) and VO(IV)/VO(III) couples. 51,52 The peak current function of both waves in complexes are different which indicate the involvement of two different electroactive species in solution, 53,54 corresponding to VO(V) and VO(III).…”

Section: Electrochemical Studymentioning

confidence: 99%

Synthesis and Characterization of UO₂(VI), Th(IV), ZrO(IV) and VO(IV) Complexes with Schiff-Base Octaazamacrocyclic Ligands

2010

Journal of the Korean Chemical Society

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Electrochemical studies of vanadium(III) and vanadium(IV) acetylacetonate complexes in dimethylsulfoxide

Cited by 58 publications

References 0 publications

A journey into the electrochemistry of vanadium compounds

A journey into the electrochemistry of vanadium compounds

Performance of a Non-Aqueous Vanadium Acetylacetonate Prototype Redox Flow Battery: Examination of Separators and Capacity Decay

Synthesis and Characterization of UO₂(VI), Th(IV), ZrO(IV) and VO(IV) Complexes with Schiff-Base Octaazamacrocyclic Ligands

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Electrochemical studies of vanadium(III) and vanadium(IV) acetylacetonate complexes in dimethylsulfoxide

Cited by 58 publications

References 0 publications

A journey into the electrochemistry of vanadium compounds

A journey into the electrochemistry of vanadium compounds

Performance of a Non-Aqueous Vanadium Acetylacetonate Prototype Redox Flow Battery: Examination of Separators and Capacity Decay

Synthesis and Characterization of UO2(VI), Th(IV), ZrO(IV) and VO(IV) Complexes with Schiff-Base Octaazamacrocyclic Ligands

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Synthesis and Characterization of UO₂(VI), Th(IV), ZrO(IV) and VO(IV) Complexes with Schiff-Base Octaazamacrocyclic Ligands