Visualization of CO 2 electrolysis using optical coherence tomography

• Published in: Nature chemistry Vol. 16; no. 6; p. 979
• Main Authors: Lu, Xin, Zhou, Chris, Delima, Roxanna S, Lees, Eric W, Soni, Abhishek, Dvorak, David J, Ren, Shaoxuan, Ji, Tengxiao, Bahi, Addie, Ko, Frank, Berlinguette, Curtis P
• Format: Journal Article
• Language: English
• Published: England 01-06-2024
• ISSN: 1755-4349

Electrolysers offer an appealing technology for conversion of CO
into high-value chemicals. However, there are few tools available to track the reactions that occur within electrolysers. Here we report an electrolysis optical coherence tomography platform to visualize the chemical reactions occurring in a CO
electrolyser. This platform was designed to capture three-dimensional images and videos at high spatial and temporal resolutions. We recorded 12 h of footage of an electrolyser containing a porous electrode separated by a membrane, converting a continuous feed of liquid KHCO
to reduce CO
into CO at applied current densities of 50-800 mA cm
. This platform visualized reactants, intermediates and products, and captured the strikingly dynamic movement of the cathode and membrane components during electrolysis. It also linked CO production to regions of the electrolyser in which CO
was in direct contact with both membrane and catalyst layers. These results highlight how this platform can be used to track reactions in continuous flow electrochemical reactors.