Electrodeposition and stripping process by long optical pathlength potential-step transmission chronoabsorptometry

Area of Science:

• Electrochemistry
• Analytical Chemistry
• Spectroscopy

Background:

• Long optical pathlength transmission spectroelectrochemistry models typically use absorbance-averaged approaches.
• Predicting stripping chronoabsorptometric waveforms accurately is crucial for quantitative analysis.

Purpose of the Study:

• To develop a theoretical model for potential-step electrodeposition and stripping processes based on transmittance-averaged spectroelectrochemistry.
• To accurately predict stripping-chronoabsorptometric waveforms, including those with peaks.

Main Methods:

• Developed a theoretical model for potential-step electrodeposition and stripping using transmittance-averaged spectroelectrochemistry.
• Verified the model using Cu(II) in an ammonia/ammonium chloride supporting electrolyte.
• Employed anodic stripping spectroelectrochemical analysis.

Main Results:

• The model accurately predicts stripping-chronoabsorptometric waveforms, including those with distinct peaks.
• Achieved a detection limit of approximately 0.01 mM for Cu(II) without stirring.
• Achieved a detection limit of approximately 0.002 mM for Cu(II) with stirring during deposition.

Conclusions:

• The developed transmittance-averaged model provides a more accurate theoretical framework for spectroelectrochemical stripping analysis.
• The method demonstrates high sensitivity for copper detection, suitable for practical sample analysis.