Redox potentials and kinetics of the Ce3+/Ce4+ redox reaction and solubility of cerium sulfates in sulfuric acid solutions

Paulenová, Alena; Creager, Stephen E.; Navratil, J.D.; Wei, Yuezhou

doi:10.1016/s0378-7753(02)00109-x

Cited by 160 publications

(114 citation statements)

References 23 publications

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“…[110] Previous research showed that the solubility and the rate of the Ce IV /Ce III reaction in aqueous H 2 SO 4 is very limited. [111] Thereaction rate is high in aqueous HNO 3 ,a nd 1m cerium solutions can be prepared; [112,113] however, nitrate is slightly reduced, which causes irreversible side reactions in the electrolyte.Abattery setup without amembrane has an efficiency of up to 76 %at 20 mA cm À2 and ac urrent efficiency of 90 %. [114] Thec erium concentration was,h owever, only 0.2 m,h ence more side reactions and therefore lower efficiency can be expected at high concentrations.W ith aN AFION-based RFB,a ne fficiency of 39 %w as achieved with 0.8 m Ce III in 4 m MSA at 50 mA cm À2 after 57 charge/discharge cycles.…”

Section: Energy Storagementioning

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: Energy Storagementioning

confidence: 99%

The Chemistry of Redox‐Flow Batteries

et al. 2015

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“…The table shows that the standard potential for the oxidation of Ce(III) ions using lead electrodes in the three-electrode arrangement and the reduction potential of Ce (IV) Table 2, the pseudoNernstian behaviour of this system indicates a clear deviation from the thermodynamically standard value E o e . Indeed, complexation of the redox species and solvent interactions affect the redox potential as it depends on the activity coefficients that, in turn, vary with the ionic strength of the solution (Paulenova et al, 2002). The similarity between the theoretical and experimental values of the slope for the oxidation of Ce(III) ions suggest a single electron transfer process whereas the larger difference of the slope value from the reduction of Ce(IV) suggests a more complex electron transfer.…”

Section: Predicted and Experimental Redox Potentials During Batch Elementioning

confidence: 99%

The use of electrolyte redox potential to monitor the Ce(IV)/Ce(III) couple

Trinidad

León

Walsh

2008

Journal of Environmental Management

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Mathematical modelling of the oxidation reduction redox potential (ORP) of an electrolyte has been carried out for a batch system comprising an electrochemical reactor and an electrolyte circuit containing a redox couple. The ORP can be useful to monitor the environmental impact of chemical species in solution that represent a risk to the environment. Considerations of four fundamental equations, namely, the Nernst equation, a mass balance, Faraday's laws of electrolysis and a first order kinetic equation, leads to an expression for the electrolyte redox potential as a function of the batch time, the electrical charge and the redox concentration. Such an expression facilitates graphical plots which can be used to estimate kinetic parameters, current efficiency and the relative redox concentration. The Ce(IV)/Ce(III) system has been chosen as a model reaction for electrolyte redox potential measurement in a batch recycle system consisting of a pumped flow through a divided FM01-LC parallel-plate electrochemical reactor (64 cm 2 projected electrode area) and a well mixed tank (3600 cm 3 ). The differences between experimental and model predictions are discussed. r

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“…, with a redox potential of 1.15 V vs. Ag/AgCl/3.5 M KCl and which has been widely studied as positive electrolyte in redox flow batteries [24][25][26] was selected as the electroactive species in order to build asymmetric hybrid capacitors that use an activated carbon (AC) in the negative electrode and multiwalled carbon nanotubes (MWCNTs) or a modified graphite felt (GF) in the positive one.…”

Section: Introductionmentioning

confidence: 99%

Enhanced energy density of carbon-based supercapacitors using Cerium (III) sulphate as inorganic redox electrolyte

Díaz

González

Santamarı́a

et al. 2015

Electrochimica Acta

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The energy density of carbon based supercapacitors (CBSCs) was significantly increased by the addition of an inorganic redox species [Ce 2 (SO 4 ) 3 ] to an aqueous electrolyte (H 2 SO 4 ). The development of the faradaic processes on the positive electrode not only significantly increased the capacitance but also the operational cell voltage of these devices (up to 1.5 V) due to the high redox potentials at which the Ce 3+ /Ce 4+ reactions occur. Therefore, in asymmetric CBSCs assembled using an activated carbon as negative electrode and MWCNTs as the positive one, the addition of Ce 2 (SO 4 ) 3 moderately increases the energy density of the device (from 1.24 W h kg -1 to 5.08 W h kg -1 ). When a modified graphite felt is used as positive electrode the energy density of the cell reaches values as high as 13.84 W h kg -1 . The resultant systems become asymmetric hybrid devices where energy is stored due to double layer formation in the negative electrode and the development of the faradaic process in the positive electrode, which acts as a battery-type electrode.

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Redox potentials and kinetics of the Ce3+/Ce4+ redox reaction and solubility of cerium sulfates in sulfuric acid solutions

Cited by 160 publications

References 23 publications

The Chemistry of Redox‐Flow Batteries

The Chemistry of Redox‐Flow Batteries

The use of electrolyte redox potential to monitor the Ce(IV)/Ce(III) couple

Enhanced energy density of carbon-based supercapacitors using Cerium (III) sulphate as inorganic redox electrolyte

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