The electrochemical promotion of nitrous oxide reduction on a lanthanum strontium iron cobalt cathode

• Type: Article in International Scientific Journal
• Date: 2022-12

Authors

Laura Holz (Author) Other; Francisco Loureiro (Author) Other; Allan Araújo (Author) Other; Vanessa Graça (Author) Other; Diogo Mendes (Author) Other; Adélio Mendes (Author) FEUP; Duncan Fagg (Author) Other

Journal

Title: International Journal of Energy Research

Vol. 46

ISSN: 0363-907X

Publisher: Wiley-Blackwell

Indexing

ISI Web of Knowledge - 0 Citations

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Other information

Authenticus ID: P-00W-Q2H

DOI: 10.1002/er.8213

Abstract (EN): Nitrous oxide (N2O) is a potent greenhouse gas and suitable methods for its mitigation are urgently required. For this reason, we study the electrochemical promotion of N2O reduction on a La0.6Sr0.4Co0.2Fe0.8O3-delta (LSCF) electrocatalyst. N2O decomposition was studied in the temperature range 600-800 degrees C, at ambient pressure, under applied polarization in galvanostatic mode. The results reveal the highest conversion increment factor of 13.12 at 600 degrees C when a current of -0.25 A was applied. The Faradaic efficiency (|?|) was calculated for the tested experimental conditions and shows values that exceed unity, evidencing Non-Faradaic Electrochemical Modification of Catalytic Activity (NEMCA) for the N2O reduction reaction. The nature of the mechanism was also assessed, showing a completely reversible effect, where the electrochemically promoted reaction rate returns to its open circuit (unpromoted) value upon removal of the applied polarization. The current work shows that the existence of the NEMCA effect can be a highly beneficial factor for the electrochemical treatment of this green-house gas, with a valuable potential for mitigation of exhaust gases.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 11