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Thermodynamic Investigation of Electrolytes of the Vanadium Redox Flow Battery (V): Conductivity and Ionic Dissociation of Vanadyl Sulfate in Aqueous Solution in the 278.15–318.15 K Temperature Range

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Abstract

Precise measurements of electrical conductivities of aqueous VOSO4 solutions at various molalities were performed from 278.15 to 318.15 K in 5 K intervals. In terms of Fuoss’s equation and Shedlovsky’s equation, the limiting molar conductance, Λ 0, and the dissociation constant, K d, of the ion-pair [VOSO4]0 were determined. From an empirical equation for the temperature dependence of dissociation constants, the thermodynamic functions for the dissociation process of the ion-pair [VOSO4]0 were calculated. It is discovered that the reaction for ion-pair dissociation is unfavorable under normal pressure and room temperature because the standard state dissociation Gibbs energy (ΔG 0) > 0. The calculated values of the dissociation entropy and the dissociation enthalpy are negative, indicating that the dissociation entropy opposes the dissociation process.

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Acknowledgements

This research was supported by the National Nature Science Foundation of China (General Programs Numbers 21373009 and 21573257).

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Authors and Affiliations

  1. School of Metallurgy, Northeastern University, Shenyang, 110819, China

    Xiang-Rong Li

  2. Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China

    Xiang-Rong Li, Ye Qin, Wei-Guo Xu, Jian-Guo Liu, Jia-Zhen Yang & Chuan-Wei Yan

  3. College of Chemistry, Liaoning University, Shenyang, 110036, China

    Wei-Guo Xu & Jia-Zhen Yang

  4. State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai, 200072, China

    Qian Xu

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  1. Xiang-Rong Li
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Correspondence to Ye Qin.

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Li, XR., Qin, Y., Xu, WG. et al. Thermodynamic Investigation of Electrolytes of the Vanadium Redox Flow Battery (V): Conductivity and Ionic Dissociation of Vanadyl Sulfate in Aqueous Solution in the 278.15–318.15 K Temperature Range. J Solution Chem 45, 1879–1889 (2016). https://doi.org/10.1007/s10953-016-0545-z

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