Reducing biofouling on optical oxygen sensors; a simple modification enabling sensor cleaning via water splitting

Area of Science:

• Environmental Science
• Electrochemistry
• Sensor Technology

Background:

• Biofouling significantly hinders environmental sensing performance.
• Existing anti-biofouling methods are often costly, energy-intensive, or rely on hazardous chemicals.

Purpose of the Study:

• To evaluate electrochemical biofouling control as a sustainable alternative for optical oxygen sensors (optodes).
• To investigate the efficacy of using the sensor's stainless-steel sleeve as an electrode.

Main Methods:

• An optical oxygen sensor was modified to function as an electrode.
• Electrochemical water splitting was employed to induce local pH changes and hydrogen gas bubble formation.
• A biofouling assay was conducted to compare the modified sensor against a non-modified control.

Main Results:

• The electrochemical approach demonstrated significant biofilm removal compared to the control.
• Water splitting successfully altered the local environment near the sensor surface.
• The method proved effective in reducing biofouling on the optical oxygen sensor.

Conclusions:

• Electrochemical biofouling control presents a viable, cost-effective solution for maintaining sensor functionality.
• This technique offers a promising, environmentally friendlier alternative to conventional anti-fouling strategies.
• The applicability of this electrochemical method may extend beyond oxygen sensors to other sensing platforms.