Effect of Sulfosalicylic Acid on Kinetics of Ce³⁺/Ce⁴⁺ Electrode Reaction

Abstract:

The effect of sulfosalicylic acid (SSA) on the electrochemical behaviour of Ce³⁺/Ce⁴⁺ redox couple was studied using voltammetry at stationary electrode and rotating disc electrode (RDE). When the SSA was added to the Ce³⁺/Ce⁴⁺ electrolyte there was change to the peak current and peak potential, i.e. the increase of peak current and the decrease of peak potential difference. The diffusion coefficient of Ce³⁺ is 6.5 × 10^-6 cm² s^-1 and the standard rate constant of the Ce³⁺/Ce⁴⁺ redox reaction is 3.2 × 10^-4 cm s^-1 in the presence of SSA, which are all larger than that in the absence of SSA (3.6 × 10^-6 cm² s^-1, 2.0 × 10^-4 cm s^-1). Therefore, the SSA as the additive in the supporting electrolyte for a cerium redox flow battery (RFB) application will result in a high voltage efficiency and will satisfy an important requirement for a RFB electrolyte.

• Periodical: Advanced Materials Research (Volume 279)
• Pages: 451-455
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.279.451
• Online since: July 2011
• Authors: Zhi Peng Xie, Feng Jiao Xiong, De Bi Zhou
• Keywords: Cerium Electrolyte, Cyclic Voltammetry (CV), Redox Flow Battery, Rotating Disc Electrode (RDE)

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