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						<h1 itemprop="headline">Specialized iNANO lecture by Brian Seger, Technical University of Denmark (DTU), Denmark</h1>
						

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							<p class="text--intro" itemprop="description"><p>A synchrotron analysis of high current density CO2 electrolysis devices</p></p>
						
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														Friday 21  November 2025,
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														&nbsp;at 11:15 -  12:00
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														<p>AUD VI (1510-213), Dept. of Chemistry</p>
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														Professor Jeppe Vang Lauritsen
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                    <p><a href="https://www.dtu.dk/english/person/brian-seger?id=66673&amp;entity=profile" target="_self">Brian Seger, Technical University of Denmark (DTU), Denmark</a></p>
<p><strong>A synchrotron analysis of high current density CO2 electrolysis devices</strong></p>
<p>This talk will analyze CO<sub>2</sub> electrolysis from a device perspective to provide insight into what are the bottlenecks in the field and how to resolve them. &nbsp;We will focus on our synchrotron based results using small angle and wide angle x-ray scattering as well as x-ray fluorescence to observe CO<sub>2</sub> electrolysis devices in real time while concomitantly measuring anode and cathode product distributions.</p>
<p>During higher current density (&gt;100 mA/cm<sup>2</sup>) CO<sub>2</sub> electrolysis devices are prone to cathodic ‘flooding’ leading to greatly enhanced hydrogen production, which can occur via a chaotic oscillatory nature.&nbsp; Via our various in-situ analysis tools, we can explain the basis for this flooding, which is primarily due to salt deposition.<sup>1</sup> By analyzing various salts (Li<sup>+</sup>, Na<sup>+</sup>, K<sup>+</sup>, Cs<sup>+</sup>) of differing solubility we show this trend more clearly.<sup>2</sup> As Cs cations fluoresce,<sup>3</sup> this allows us to show how an applied potential drags these cation salts through an anion exchange membrane, leading to the salt build-up and concomitant deposition in these electrolyzers.</p>
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    <p>&nbsp;As CO electrolysis allows us to switch to more soluble hydroxide salts, we show this is a major key to ensuring long-term stability (&gt;100 hours).<sup>4</sup>&nbsp; However practical issues such as anodic dissolution of IrO2 can redeposit on the cathode producing&nbsp; hydrogen as shown by our synchrotron results.&nbsp; Switching to a nickel anode resolve this, however we show that the anodic pH must be controlled to prevent acetate/acetic acid from driving the pH down, and thus corroding the device.</p>
<p><strong>References:</strong><br> 1 Moss, AB, Garg, S, et al. Joule 2023, 7,2, 350-365<br> 2 Garg, S. Xu, Q, et al. Energy &amp; Environmental&nbsp; Science, 2023 16, 1631-1643<br> 3 Xu, Q, Garg, S, et al. Nat. Cat.&nbsp; 2023, 11, 1042-1051<br> 4 Joensen, B, Xu, Q. et al. Joule 2024, 8, 6, 1754-177</p>


            
                



            
            
                



            
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