EQCM Studies on the Effect of Anti-freezing Additives on the Storage Behavior of Ions at Activated Carbon Electrodes in NaClO4 Aqueous Solutions†

doi:10.7503/cjcu20130676

Abstract

Abstract:

Electrochemical quartz crystal microbalance(EQCM) was used to investigate the adsorption of Na⁺ into the micropores of activated carbon in 5 mol/L NaClO₄+x mol/L MeOH and 5 mol/L NaClO₄+x mol/L EtOH aqueous solutions. Molecule numbers of methanol or ethanol associated with each Na⁺ at the interfaces were estimated. The results show that methanol and ethanol are adsorbed into the micropores together with Na⁺; the higher the concentration of methanol and ethanol in bulk solutions was, the more molecule numbers of methanol or ethanol associated with each Na⁺ adsorpted into the pores of activated carbon; methanol and ethanol adsorpted into the pores occupied some space of the micropores and lowered the dielectric constant of the double layers, thus suppressed the specific capacitance of Maxsorb negative electrodes.

Key words: Electrochemical quartz crystal microbalance(EQCM), NaClO₄, Activated carbon, Anti-freezing additive

CLC Number:

O646

TrendMD:

GAO Jichao, QI Li, WANG Hongyu. EQCM Studies on the Effect of Anti-freezing Additives on the Storage Behavior of Ions at Activated Carbon Electrodes in NaClO₄ Aqueous Solutions^†[J]. Chem. J. Chinese Universities, 2014, 35(3): 608.

Figures/Tables 4

Fig.1 Cyclic voltammograms of activated carbon electrodes(A) and in situ EQCM responses when Na+ was adsorbed into the micropores in various electrolytes(B)Electrolyte: a. 5 mol/L NaClO4; b. 5 mol/L NaClO4+3 mol/L EtOH; c. 5 mol/L NaClO4+5 mol/L MeOH. d. Theoritical curve.

Fig.2 Cyclic voltammograms(A, C) of activated carbon electrodes and in situ EQCM responses(B, D) when Na+ was adsorbed into the micropores in 5 mol/L NaClO4+x mol/L EtOH(A, B) and 5 mol/L NaClO4+x mol/L MeOH(C, D) aqueous solutions, respectively

Fig.3 Relationship between the specific capacitance of activated carbon electrodes(a, b), molar weight(c, d) of solvated Na+ and concentrations of ethanol or methanol in 5 mol/L NaClO4+x mol/L EtOH(b, d) or 5 mol/L NaClO4+x mol/L MeOH(a, c) aqueous solutions

Fig.4 Relationship between specific capacitance of activated carbon electrodes and molar weight of solvated Na+ in 5 mol/L NaClO4+x mol/L EtOH(a) and 5 mol/L NaClO4+x mol/L MeOH(b) aqueous solutions, respectively

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EQCM Studies on the Effect of Anti-freezing Additives on the Storage Behavior of Ions at Activated Carbon Electrodes in NaClO₄ Aqueous Solutions^†

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