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Modification of boron doped diamond electrode by electrochemical oxidation of p-aminobenzoic acid
 Švárová, Eliška ; Fischer, Jan (advisor) ; Dejmková, Hana (referee)
This bachelor's thesis deals with the modification of a boron-doped diamond electrode (BDDE) by the electrochemical oxidation of p-aminobenzoic acid. Subsequently, the stability of the modified electrode was investigated by a study of various parameters. The modification of the electrode was performed using cyclic voltammetry (CV) in LiClO4 electrolyte. The success of the modification and its subsequent stability was investigated by the CV method in electrolyte KCl in the presence of the redox system [Fe(CN)6]4-/3- . Stability was tested in terms of ultrasonic cleaning in isopropanol and anodic cleaning in 0.5 mol l-1 H2SO4. It was found that the modification of the surface cannot be completely removed by ultrasonic cleaning in isopropanol, in contrast, pulses of period 2 seconds with a high positive potential are enough to completely remove the modification. Optimal conditions for surface stability were determined. The ideal number of cycles for surface modification was set at 5 cycles. The use of different electrolytes during modification (KClO4 and LiClO4) determined that in the case of modification in the KClO4 electrolyte, it is possible to measure in the range of the potential window from -400 to +1600 mV and in the case of LiClO4 in the range of -400 to +1500 mV without breaking the modified...
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