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Energy efficient electrochemical reduction of CO2 to CO using a three-dimensional porphyrin/graphene hydrogel

Journal Article


Abstract


  • Although electrochemical CO 2 reduction is one of the most promising ways to convert atmospheric CO 2 into value-added chemicals, there are still numerous limitations to overcome to achieve highly efficient CO 2 conversion performance. Herein, we report for the first time the development and use of a three-dimensional iron porphyrin-based graphene hydrogel (FePGH) as an electrocatalyst for extremely efficient robust CO 2 reduction to CO. Electrocatalytic CO 2 conversion was performed in aqueous medium with FePGH, which has a highly porous and conductive 3D graphene structure, resulting in high catalytic activity for CO production with ∼96.2% faradaic efficiency at a very low overpotential of 280 mV. Furthermore, FePGH showed considerable catalytic durability maintaining a consistent CO yield (96.4% FE) over 20 h electrolysis at the same overpotential, corresponding to the highest cathodic energy efficiency yet observed of 79.7% compared to other state-of-the-art immobilised metal complex electrocatalysts. This approach to fabricating a 3D graphene-based hydrogel electrocatalyst should provide an exciting new avenue for the development of other kinds of molecular electrocatalysts.

Publication Date


  • 2019

Citation


  • Choi, J., Kim, J., Wagner, P., Gambhir, S., Jalili, R., Byun, S., Sayyar, S., Lee, Y., MacFarlane, D. R., Wallace, G. G. & Officer, D. L. (2019). Energy efficient electrochemical reduction of CO2 to CO using a three-dimensional porphyrin/graphene hydrogel. Energy and Environmental Science, 12 (2), 747-755.

Scopus Eid


  • 2-s2.0-85061914651

Number Of Pages


  • 8

Start Page


  • 747

End Page


  • 755

Volume


  • 12

Issue


  • 2

Place Of Publication


  • United Kingdom

Abstract


  • Although electrochemical CO 2 reduction is one of the most promising ways to convert atmospheric CO 2 into value-added chemicals, there are still numerous limitations to overcome to achieve highly efficient CO 2 conversion performance. Herein, we report for the first time the development and use of a three-dimensional iron porphyrin-based graphene hydrogel (FePGH) as an electrocatalyst for extremely efficient robust CO 2 reduction to CO. Electrocatalytic CO 2 conversion was performed in aqueous medium with FePGH, which has a highly porous and conductive 3D graphene structure, resulting in high catalytic activity for CO production with ∼96.2% faradaic efficiency at a very low overpotential of 280 mV. Furthermore, FePGH showed considerable catalytic durability maintaining a consistent CO yield (96.4% FE) over 20 h electrolysis at the same overpotential, corresponding to the highest cathodic energy efficiency yet observed of 79.7% compared to other state-of-the-art immobilised metal complex electrocatalysts. This approach to fabricating a 3D graphene-based hydrogel electrocatalyst should provide an exciting new avenue for the development of other kinds of molecular electrocatalysts.

Publication Date


  • 2019

Citation


  • Choi, J., Kim, J., Wagner, P., Gambhir, S., Jalili, R., Byun, S., Sayyar, S., Lee, Y., MacFarlane, D. R., Wallace, G. G. & Officer, D. L. (2019). Energy efficient electrochemical reduction of CO2 to CO using a three-dimensional porphyrin/graphene hydrogel. Energy and Environmental Science, 12 (2), 747-755.

Scopus Eid


  • 2-s2.0-85061914651

Number Of Pages


  • 8

Start Page


  • 747

End Page


  • 755

Volume


  • 12

Issue


  • 2

Place Of Publication


  • United Kingdom