Anomalous solubility of oxygen in acetonitrile/water mixture containing tetra-n-butylammonium perchlorate supporting electrolyte; the solubility and diffusion coefficient of oxygen in anhydrous acetonitrile and aqueous mixtures

► c(O2), D(O2) and D(O2−) are measured in anhydrous MeCN/0.1M TBAP on Pt electrodes. ► Diffusional activation energies are evaluated via Stokes-Einstein relationship. ► Thermodynamic parameters are determined experimentally. ► c(O2) and D(O2) are measured in MeCN/H2O mixtures at 298.5 K on GC electr...

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Bibliographic Details
Published in:Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2013-01, Vol.688 (1), p.328-335
Main Authors: Li, Qian, Batchelor-McAuley, Christopher, Lawrence, Nathan S., Hartshorne, Robert S., Compton, Richard G.
Format: Article
Language:English
Subjects:
acetonitrile
Acetonitrile/water mixture
carbon
Diffusion coefficient
Diffusional activation energy
diffusivity
dissolved oxygen
Electrochemical oxygen reduction
electrodes
electrolytes
energy
entropy
equations
hydrogen bonding
mixing
oxygen
platinum
Solubility
solvents
superoxide anion
Temperature
water content
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Summary:► c(O2), D(O2) and D(O2−) are measured in anhydrous MeCN/0.1M TBAP on Pt electrodes. ► Diffusional activation energies are evaluated via Stokes-Einstein relationship. ► Thermodynamic parameters are determined experimentally. ► c(O2) and D(O2) are measured in MeCN/H2O mixtures at 298.5 K on GC electrodes. We report the oxygen electro-reduction in air-saturated acetonitrile (MeCN) solution supported by 0.1M tetra-n-butylammonium perchlorate salt under two experimental conditions: (1) anhydrous MeCN at elevated temperatures from 298.5 to 313.0K on platinum electrodes; (2) water-mixed MeCN solution (mole fraction of MeCN: 0.72
ISSN:1572-6657
1873-2569
DOI:10.1016/j.jelechem.2012.07.039