A formal scan rate in staircase and square-wave voltammetry (CROSBI ID 564392)
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Podaci o odgovornosti
Jadreško, Dijana ; Zelić, Marina ; Lovrić, Milivoj
engleski
A formal scan rate in staircase and square-wave voltammetry
Because of the fact that real measurements are sometimes described in terms of the (formal) scan rate, the functional relationships between this parameter and the peak current in staircase (SCV) and square-wave voltammetry (SWV) were investigated theoretically for simple reversible and totally irreversible electrode reactions. The real SCV peak current is proportional to the square-root of the formal scan rate, v, and inversely proportional to ΔE0.0541: -ip = 0.1453nFScox*(D/π)½v½∆E-0.0541 where v = ΔE / τ. In SWV of a reversible electrode reaction the net peak current depends primarily on the frequency, while the influence of the formal scan rate is of minor importance: ∆ip = nFScox*D½(0.7339f½ + 0.0026∆E0.3118v½). On the other hand, in SWV of a totally irreversible electrode reaction, the real net peak current is a stronger function of the formal scan rate: ∆ip= 0.0942nFScox*D½∆E-0.11 v½ . Experimental results, obtained in perchlorate solutions of Eu3+, are in relatively good agreement with the theory.
formal scan rate; staircase voltammetry; square-wave voltammetry; potential step incremen
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Podaci o prilogu
26-26.
2010.
objavljeno
Podaci o matičnoj publikaciji
Book of Abstracts of the 13th International Conference on Electroanalysis
Gijon: European Society for ElectroAnalytical Chemistry
Podaci o skupu
13th International Conference on Electroanalysis
poster
20.06.2010-24.06.2010
Gijón, Španjolska