Articles written in Journal of Chemical Sciences

    • Reduction of CO₂ to CO in presence of H₂ on strontium doped lanthanum manganite cathode in solid oxide electrolysis cell


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      Electrochemical performance of La₀.₈Sr₀.₂MnO₃−δ (LSM) for CO₂ reduction in solid oxide cell is studied by performing impedance spectroscopy measurement and current-voltage characterizations for varying ratio of CO₂/H₂. Ohmic resistance (RΩ) is observed to be slightly increased from 2.59 to 2.70 Ωcm², however; the cathode polarization resistance (R₂) decreased significantly from 16.20 to 4.70 Ω cm² as the H2 percentage increased from 8 to 82%, respectively. As the H₂ content increased in feed gas, the improved polarization resistance indicated an enhanced activity of LSM for CO₂ reduction reaction. Furthermore, the cathode polarization resistance for CO₂/H₂ of 92/08, is observed to be decreased from 16.20 Ω cm² (OCV 0.89 V) to 1.90 Ω cm² (2.0 V) as the applied potential increased in the electrolysis mode of operation. A maximum conversion of CO₂ of 6.0% with 55% of faradaic efficiency for the production of CO is achieved for CO₂/H₂ ratio of 38/62, which is supported by improved current-voltage polarization, i.e., an increase in reduction current from −0.28 to −0.32 A cm−2 (at 2.5 V) as the CO₂/H₂ ratio decreased from 92/08 to 38/62 respectively. These results demonstrate LSM as an active electrocatalyst to reduce CO₂, which could further be improved by increasing the H₂ concentration in the feed composition to the cathode.

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