Chromium redox couples for application to redox flow batteries

Bae, Chulheung; Roberts, Edward P.L.; Dryfe, Robert A. W.

doi:10.1016/s0013-4686(02)00649-7

Cited by 113 publications

(72 citation statements)

References 24 publications

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“…[261]). [248] Thekinetics of the Cr III /Cr II -EDTAredox reactions at pH 4-7 was fast, with an outer-sphere reaction mechanism being suggested. However,t he kinetics of Cr V /Cr III -EDTAw as relatively unfavorable.T he advantage of this system is the mildness of the media used, which may be important for the long-term stability of RFBs.…”

Section: Inorganic Metal-ligandmentioning

confidence: 99%

The Chemistry of Redox‐Flow Batteries

et al. 2015

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The development of various redox-flow batteries for the storage of fluctuating renewable energy has intensified in recent years because of their peculiar ability to be scaled separately in terms of energy and power, and therefore potentially to reduce the costs of energy storage. This has resulted in a considerable increase in the number of publications on redox-flow batteries. This was a motivation to present a comprehensive and critical overview of the features of this type of batteries, focusing mainly on the chemistry of electrolytes and introducing a thorough systematic classification to reveal their potential for future development.

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Section: Inorganic Metal-ligandmentioning

confidence: 99%

The Chemistry of Redox‐Flow Batteries

et al. 2015

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“…Photochemistry of Cr(III) complexes has been investigated for a long time but the studies were focused on photosubstitution processes which are of minor environmental relevance in comparison with the photoredox ones [123,[184][185][186][187][188][189][190][191]. Subsequent research [137,[192][193][194] has shown that in the Cr(III) complexes with reducible ligands (L) the LMCT transitions can induce the inner-sphere photoinduced electron transfer (PET), e.g., (27) or the back electron transfer is accompanied with the L •+ substitution.…”

Section: Redox Photochemistry Of Cr(iii)mentioning

confidence: 99%

Homogeneous photocatalysis by transition metal complexes in the environment

Cieśla

Kocot

Mytych

et al. 2004

Journal of Molecular Catalysis A: Chemical

219

116

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“…Thus, to maximize the energy efficiency, moisture should be avoided completely to prevent the formation of VO(acac) 2 . Nevertheless, the new HNFBs is more moisture resistant than traditional RFBs, because the in situ recovery of V(acac) 3 can be achieved in HNFBs during the discharge process. Furthermore, HNFBs allows two‐electron transfer redox reactions per V ion, as demonstrated in Figure , to enhance the energy density of the cell.…”

Section: Resultsmentioning

confidence: 99%

“…The energy efficiency decay of the V 2 + /V 3 + reactioni saresulto ft he graduald ecrease of the discharge plateau voltage with increasing the number of cycles. The overall energy efficiencyo ft he system ranges from 72 to 80 %o wing to the poor efficiency of the V 3 + /V 4 + redox reactionw ith the formation of VO(acac) 2 .T hus, to maximize the energy efficiency,m oisture should be avoided completely to prevent the formation of VO(acac) 2 .N evertheless, the new HNFBsi smore moisture resistant than traditional RFBs, [17][18][19][20][21][22][23] because the in situ recovery of V(acac) 3 can be achieved in HNFBs during the discharge process. Furthermore, HNFBs allows twoelectron transfer redox reactions per Vi on, as demonstrated in Figure 12, to enhance the energy density of the cell.…”

Section: Resultsmentioning

confidence: 99%

New Mechanism for the Reduction of Vanadyl Acetylacetonate to Vanadium Acetylacetonate for Room Temperature Flow Batteries

2016

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In this study, a new mechanism for the reduction of vanadyl acetylacetonate, VO(acac) , to vanadium acetylacetonate, V(acac) , is introduced. V(acac) has been studied for use in redox flow batteries (RFBs) for some time; however, contamination by moisture leads to the formation of VO(acac) . In previous work, once this transformation occurs, it is no longer reversible because there is a requirement for extreme low potentials for the reduction to occur. Here, we propose that, in the presence of excess acetylacetone (Hacac) and free protons (H ), the reduction can take place between 2.25 and 1.5 V versus Na/Na via a one-electron-transfer reduction. This reduction can take place in situ during discharge in a novel hybrid Na-based flow battery (HNFB) with a molten Na-Cs alloy as the anode. The in situ recovery of V(acac) during discharge is shown to allow the Coulombic efficiency of the HNFB to be ≈100 % with little or no capacity decay over cycles. In addition, utilizing two-electron-transfer redox reactions (i.e., V /V and V /V redox couples) per V ion to increase the energy density of RFBs becomes possible owing to the in situ recovery of V(acac) during discharge. The concept of in situ recovery of material can lead to more advances in maintaining the cycle life of RFBs in the future.

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Chromium redox couples for application to redox flow batteries

Cited by 113 publications

References 24 publications

The Chemistry of Redox‐Flow Batteries

The Chemistry of Redox‐Flow Batteries

Homogeneous photocatalysis by transition metal complexes in the environment

New Mechanism for the Reduction of Vanadyl Acetylacetonate to Vanadium Acetylacetonate for Room Temperature Flow Batteries

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