Enhanced CO2 electrolysis through Mn substitution coupled with Ni exsolution in lanthanum calcium titanate electrodes
Date
09/05/2024Grant ID
ep/l017008/1
EP/R023751/1
EP/T019298/1
EP/V027050/1
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In this study, perovskite oxides La0.3Ca0.6Ni0.05MnxTi0.95−xO3−γ (x = 0, 0.05, 0.10) are investigated as potential solid oxide electrolysis cell cathode materials. The catalytic activity of these cathodes toward CO2 reduction reaction is significantly enhanced through the exsolution of highly active Ni nanoparticles, driven by applying a current of 1.2 A in 97% CO2 – 3% H2O. The performance of La0.3Ca0.6Ni0.05Ti0.95O3−γ is notably improved by co-doping with Mn. Mn dopants enhance the reducibility of Ni, a crucial factor in promoting the in situ exsolution of metallic nanocatalysts in perovskite (ABO3) structures. This improvement is attributed to Mn dopants enabling more flexible coordination, resulting in higher oxygen vacancy concentration, and facilitating oxygen ion migration. Consequently, a higher density of Ni nanoparticles is formed. These oxygen vacancies also improve the adsorption, desorption, and dissociation of CO2 molecules. The dual doping strategy provides enhanced performance without degradation observed after 133 h of high-temperature operation, suggesting a reliable cathode material for CO2 electrolysis.
Citation
Zhang , N , Naden , A B , Zhang , L , Yang , X , Connor , P A & Irvine , J T S 2024 , ' Enhanced CO 2 electrolysis through Mn substitution coupled with Ni exsolution in lanthanum calcium titanate electrodes ' , Advanced Materials , vol. 36 , no. 19 , 2308481 . https://doi.org/10.1002/adma.202308481
Publication
Advanced Materials
Status
Peer reviewed
ISSN
0935-9648Type
Journal article
Description
Funding: This work was financially supported by the Industrial Decarbonisation Research and Innovation Centre. Further support was kindly provided by EPSRC, under research grant numbers EP/L017008/1, EP/R023751/1 and EP/T019298/1.Collections
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