Details

Autor(en) / Beteiligte

• Holz, Laura I. V.
• Loureiro, Francisco J. A.
• Araújo, Allan J. M.
• Graça, Vanessa C. D.
• Mendes, Diogo
• Mendes, Adélio
• Fagg, Duncan P.

Titel

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

Ist Teil von

• International journal of energy research, 2022-12, Vol.46 (15), p.22038-22048

Ort / Verlag

Chichester, UK: John Wiley & Sons, Inc

Erscheinungsjahr

2022

Quelle

Wiley Online Library

Beschreibungen/Notizen

• Summary 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‐δ (LSCF) electrocatalyst. N2O decomposition was studied in the temperature range 600‐800°C, at ambient pressure, under applied polarization in galvanostatic mode. The results reveal the highest conversion increment factor of 13.12 at 600°C when a current of −0.25 A was applied. The Faradaic efficiency (|Λ|) 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. The electrochemical promotion of N2O reduction on a La0.6Sr0.4Co0.2Fe0.8O3‐δ (LSCF) electrocatalyst in a 3‐probe cell electrolyser reactor, was studied in the temperature range 600‐800°C. Non‐Faradaic Electrochemical Modification of Catalytic Activity (NEMCA) was achieved for all tested temperatures. The highest enhancements were at 600°C, at −0.25 A, where a |Λ| value of 8.95 and conversion increment factor of 13.15 were achieved. The current work shows that the existence of NEMCA can be an effective factor for the electrochemical treatment of this green‐house gas.