The oxidation of organic additives in the positive vanadium electrolyte and its effect on the performance of vanadium redox flow battery

Nguyen, Tam D.; Whitehead, Adam; Scherer, Günther G.; Wai, Nyunt; Oo, Moe Ohnmar; Bhattarai, Arjun; Chandra, Ghimire P.; Xu, Zhichuan J.

doi:10.1016/j.jpowsour.2016.10.017

Cited by 28 publications

(18 citation statements)

References 30 publications

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“…Dispersant IIIA delayed precipitation of vanadium salts significantly without causing undesirable side effects. The beneficial effects of some additives have been questioned [473,489]. Oxidation of the additive associated with reduction of V(V) ions was suggested as the cause.…”

Section: Non-carbon Materials and Miscellaneous Conceptsmentioning

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: Non-carbon Materials and Miscellaneous Conceptsmentioning

confidence: 99%

Electrocatalysis at Electrodes for Vanadium Redox Flow Batteries

Holze

2018

Batteries

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“…H3PO4 (1 wt%) was found to be most effective at maintaining VO2 + concentration at 30°C while a 1 wt% H3PO4 + 2 wt% ammonium sulphate formulation performed best at 50°C and was A number of organic additives were proposed [100] and researchers found that amino acids [101], coulter dispersant [102], polyacrylic acid and its mixture with CH3SO3H [103] as well Page 24 of 63 as fructose, mannitol, glucose, and D-sorbitol [104] and other [105] organic compounds could improve the temperature stability of the catholyte in the VRFB. However, Nguyen et al studied the effect of additives glucose and ascorbic acid, and found that they only lead to an apparently enhanced stability [105]. They claim that the catholyte with organic molecules is more stable because these molecules are oxidised by the VO 2+ ions, thereby reducing the state of charge (SOC) of the VRFB.…”

Section: Review Of Battery Chemistriesmentioning

confidence: 99%

Redox flow batteries—Concepts and chemistries for cost-effective energy storage

et al. 2018

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Electrochemical energy storage is one of the few options to store the energy from intermittent renewable energy sources like wind and solar. Redox flow batteries (RFBs) are such an energy storage system, which has favourable features over other battery technology, e.g. solid state batteries, due to their inherent safety and the independent scaling of energy and power content. However, because of their low energy-density, low power-density and the cost of components such as redox species and membranes, commercialised RFB systems like the all-vanadium chemistry cannot make full use of the inherent advantages over other systems. In principle, there are three pathways to improve RFBs and to make them viable for large scale application: First, to employ electrolytes with higher energy density. This goal can be achieved by increasing the concentration of redox species, employing redox species that store more than one electron or by increasing the cell voltage. Second, to enhance the power output of the battery cells by using high kinetic redox species, increasing the cell voltage, implementing novel cell designs or membranes with lower resistance. The first two means reduce the electrode surface area needed to supply a certain power output, thereby bringing down costs for expensive components such as membranes. Third, to reduce the costs of single or multiple components such as redox species or membranes. To achieve these objectives it is necessary to develop new battery chemistries and cell configurations. In this review we focus on a comparison of promising cell chemistries, be they all-liquid, slurries or hybrids combining liquid, gas and solid phases.Aim is to elucidate which redox-system is most favourable in terms of energy-density, power-density and capital cost. Also the choice of solvent and the selection of an inorganic or organic redox couples with the entailing consequences are discussed.

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“…Unfortunately, the VRFB suffers from low specific energy, prompting numerous efforts towards improving its energy efficiency and specific energy. Key areas in VRFB research include the development of components such as, electrodes [6][7][8][9][10][11][12][13][14], membranes [15][16][17] or electrolytes [18][19][20], as well as studies with respect to cell design and modelling [21][22][23] and performance monitoring of cell and stacks [18,[24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%