20.500.12556/DKUM-91814 Deactivation of copper electrocatalysts during CO [sub] 2 reduction occurs via dissolution and selective redeposition mechanism As electrochemical CO2 reduction (ECR) nears industrialisation levels, addressing the uncontrolled stability, restructuring, and deactivation of copper (Cu) catalysts during operation becomes as crucial as achieving high activity and selectivity for a single product. This study used a high-surface area Cu catalyst that exhibited changes in ECR product selectivity over prolonged operation. The detection of dissolved Cu species during electrolysis confirmed an intermediates-mediated Cu dissolution mechanism at ECR potentials (−0.8 to −1.1 V vs. reversible hydrogen electrode). The findings suggest that the electrodeposition of dissolved Cu species is biased towards Cu catalyst sites with lower reaction intermediates coverage, e.g. adsorbed CO (*CO). A dynamic equilibrium between dissolution and subsequent selective redeposition gradually led to morphological restructuring, resulting in a shift in selectivity away from ECR and towards hydrogen production. With the obtained extensive experimental results, theoretical modelling, and literature data, four interconnected parameters governing restructuring and selectivity shifts were recognised: (i) size and (ii) crystallographic orientation of facets rsc.li/materials-a Introduction of the nanoparticles, (iii) *CO coverage and (iv) CObridge vs. COatop ratio. elektrokemija katalizatorji baker proizvodnja vodika electrochemistry catalysts copper hydrogen production elektrokemija katalizatorji baker proizvodnja vodika true false true RSC Publications Angleški jezik Slovenski jezik https://pubs.rsc.org/en/journals/journalissues/ta#!recentarticles&adv Članek v reviji 2025-02-09 04:58:03 2025-03-20 11:46:59 2026-01-19 14:49:16 0000-00-00 00:00:00 2025 0 0 str. 4119-4128 št. 6 let. 13 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2024-09-11 2024-12-07 2024-12-10 544.5/.6 221109763 10.1039/d4ta06466f 2050-7496 d4ta06466f.pdf d4ta06466f.pdf 1 9612F67D736CB45245883FD3AA9BC463 debd2a3083eca7cf58fd34182d015b1c74f69b8e5509a0228cb591cdaf6da5ef c864fc58-7bf1-11f0-b405-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=195413 https://pubs.rsc.org/en/content/articlelanding/2025/ta/d4ta06466f 0 104c6a3f-e69a-11ef-96c6-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=188529 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0