Ru rich Ru-Mn-O phases for selective suppression of chlorine evolution in sea water electrolysis

0576521 - ÚFCH JH 2024 RIV GB eng J - Journal Article
Astudillo, Catalina - Minhová Macounová, Kateřina - Frandsen, A. M. - Nebel, Roman - Rossmeisl, J. - Krtil, Petr
Ru rich Ru-Mn-O phases for selective suppression of chlorine evolution in sea water electrolysis.
Electrochimica acta. Roč. 470, DEC 2023 (2023), č. článku 143295. ISSN 0013-4686. E-ISSN 1873-3859
R&D Projects: GA ČR(CZ) GA21-03037S; GA MŠMT(CZ) LM2018124
Institutional support: RVO:61388955
Keywords : oxygen evolution reaction * chlorine evolution reaction * selectivity * electrolysis * oxide anode
OECD category: Physical chemistry
Impact factor: 6.6, year: 2022
Method of publishing: Limited access

Limits of steering selectively gas evolving reaction on Ru rich oxide phases in Ru-Mn-O system were investigated by combined theoretical and experimental approach. Ru1-xMnxO2 materials of single phase nature conforming to the rutile structure were prepared by the spray freeze - freeze drying approach and tested for activity in oxygen and chlorine evolution reactions. The overall electrocatalytic activity of the prepared materials increases with increasing Mn content. In this manner also increases the selectivity towards oxygen evolution in acidic chloride containing solutions. Closer analysis shows that the amount of evolved oxygen (for a given electrode material) is practically independent of the chloride concentration. This is illustrated by the order of the oxygen evolution reaction with respect to chloride concentration being close to 0 in the whole range of the prepared Ru-Mn-O phases. The high selectivity towards oxygen evolution reaction coincides with low tendency of Ru-Mn-O phases to evolve oxygen via lattice oxygen activation (LOER). The experimental behavior is further confirmed by DFT analysis of the reactivity of the Ru-Mn-O surfaces.
Permanent Link: https://hdl.handle.net/11104/0346078