Abstract
The proline film modified electrode and its electrochemical behavior was studied by cyclic voltammetry and spectroelectrochemistry . After incorporation of Ni(Ⅱ), the cyclic voltammograms of the proline Ni(Ⅱ) film electrode exhibited a typical redox peak, which appeared at potential of 0.52 V anodic and 0.44 V cathodic in NaOH. The formal potentials E ' were linearly dependent on the pH, and the peak currents ip were linearly dependent on the square root of the scan rates,thus charge transfer in the film was controlled by diffusion. The diffusion coefficient is figured out to be 2×10 -10 cm 2·s -1 . The catalytic oxidation peaks of formaldehyde and ethanol occurred at 0.67 V and 0.62 V respectively,much more negative than the potential at Pro/GC and the bare glassy carbon (GC) electrode in 0.1 mol·L -1 NaOH. Experimental results showed that the reaction orders of formaldehyde and OH - were 1 and 2 respectively. The anodic peak. currents of formaldehyde and ethanol were proportional to their concentrations between 10 -6 ～10 -4 mol·L -1 and 3×10 -4 ～3×10 -3 mol·L -1 respectively. More importantly, the electrode stability in electrocatalytic oxidation of formaldehyde was very good . Cyclic scanning 120min, the anodic peak current of formaldehyde decreased 1/10 and nearly turned to be stable at last.
Keywords
Formaldehyde, Ethanol, Proline, Modified electrode, Cyclic voltammetry spectroelectrochemistry
Publication Date
2002-05-28
Online Available Date
2002-05-28
Revised Date
2002-05-28
Received Date
2002-05-28
Recommended Citation
Yu-rong MA, Qiu-xia YANG, Guo-bao LI, Zheng-kai XI, Xue-lin WANG.
Electrocatalytic oxidation of formaldehyde on the proline film modified electrode[J]. Journal of Electrochemistry,
2002
,
8(2): 207-212.
DOI: 10.61558/2993-074X.1458
Available at:
https://jelectrochem.xmu.edu.cn/journal/vol8/iss2/10
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