Photoelectrochemical oxygen evolution with interdigitated array electrodes: the example of TiO₂.

Area of Science:

• Electrochemistry
• Materials Science
• Renewable Energy

Background:

• Photoelectrochemical water splitting is a key technology for clean energy production.
• Understanding reaction mechanisms is crucial for designing efficient catalysts.
• Interdigitated array (IDA) electrodes offer a unique platform for in situ electrochemical studies.

Purpose of the Study:

• To investigate the photoelectrochemical oxygen evolution reaction using IDA electrodes.
• To detect reaction products in real-time using a generation-collection mode.
• To evaluate titanium dioxide (TiO2) as a model catalyst for photoelectrochemical water splitting.

Main Methods:

• Utilized interdigitated array (IDA) electrodes in a generation-collection mode.
• Decorated TiO2 nanoparticles onto the IDA generator electrode via electrophoresis.
• Performed in situ detection of oxygen evolution during photoelectrochemical water splitting.

Main Results:

• Successfully decorated TiO2 onto IDA electrodes, demonstrating photoelectrochemical activity.
• The generation-collection mode effectively distinguished O2 production from the overall photocurrent.
• Observed the mass transfer of O2 from the TiO2 generator to the collector electrode.
• High potential ranges indicated potential byproduct formation or non-faradaic current.

Conclusions:

• IDA electrodes with TiO2 catalysts are effective for studying photoelectrochemical oxygen evolution.
• The generation-collection mode provides real-time monitoring of O2 production.
• Further investigation is needed to understand byproduct formation at higher potentials.