Stable electrochemical urea oxidation on Ruddlesden–Popper oxide catalysts

Stable electrochemical urea oxidation on Ruddlesden–Popper oxide catalysts

Urea oxidation reaction (UOR) is a crucial process for the efficiency of urea-based energy conversion technologies, including electrocatalytic water splitting and urea fuel cells. These technologies are considered alternatives to the traditional hydrogen production methods due to lower overpotential...

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Bibliographic Details
Published in:Journal of solid state electrochemistry Vol. 28; no. 6; pp. 1799 - 1807
Main Authors: Sinitsyn, Pavel A., Atoian, Edita M., Ivchenko, Stanislav S., Pazhetnov, Egor M., Volkov, Mikhail A., Nikitina, Viktoria A., Kuznetsov, Vitaly V., Levchenko, Sergey V.
Format: Journal Article
Language:English
Published: Berlin/Heidelberg Springer Berlin Heidelberg 2024
Springer Nature B.V
Subjects:
Alkali metals
Alternative fuels
Analytical Chemistry
Carbonates
Catalysts
Cesium
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Condensed Matter Physics
Electrochemistry
Electrolytic cells
Energy conversion
Energy Storage
Fuel cells
High temperature
Hydrogen production
Kinetics
Original Paper
Oxidation
Physical Chemistry
Production methods
Solubility
Ureas
Water splitting
Electrocatalysis
Ruddlesden-Popper oxides
Urea oxidation reaction
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Summary:Urea oxidation reaction (UOR) is a crucial process for the efficiency of urea-based energy conversion technologies, including electrocatalytic water splitting and urea fuel cells. These technologies are considered alternatives to the traditional hydrogen production methods due to lower overpotentials and higher cost-effectiveness. However, sluggish UOR kinetics currently limit the practical applications of these technologies. In this study, we investigated the influence of electrolyte composition and temperature on the performance of Ruddlesden-Popper complex oxides in UOR. Our findings demonstrate that the formation of a carbonate layer at the electrode surface is a critical factor limiting UOR kinetics. This layer is mainly composed of carbonates of alkali metal from the solution and can be eliminated at elevated temperatures due to increased solubility. Specifically, we found that LaSrNi 0 . 5 Co 0 . 5 O 4±δ catalyst exhibited superior electrocatalytic activity (6 mA cm −2 at 1.45 V vs. RHE with loading 100 µg cm −2 ) operating at 60 °C in 5 M KOH. Moreover, changing the solution to cesium hydroxide, we were able to avoid the creation of a non-conductive layer due to higher solubility of the cesium carbonate, thus stabilizing the catalytic reaction.
ISSN:1432-8488
1433-0768
DOI:10.1007/s10008-024-05814-9