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

Jay Choi, Jeonghun Kim, Pawel Wagner, Sanjeev Gambhir, Rouhollah Jalili, Seoungwoo Byun, Sepidar Sayyar, Yong Min Lee, Douglas R. MacFarlane, Gordon G. Wallace, David L. Officer

Research output: Contribution to journalArticleResearchpeer-review

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Abstract

Although electrochemical CO2 reduction is one of the most promising ways to convert atmospheric CO2 into value-added chemicals, there are still numerous limitations to overcome to achieve highly efficient CO2 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 CO2 reduction to CO. Electrocatalytic CO2 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.

Original languageEnglish
Pages (from-to)747-755
Number of pages9
JournalEnergy and Environmental Science
Volume12
Issue number2
DOIs
Publication statusPublished - 1 Feb 2019

Cite this

Choi, Jay ; Kim, Jeonghun ; Wagner, Pawel ; Gambhir, Sanjeev ; Jalili, Rouhollah ; Byun, Seoungwoo ; Sayyar, Sepidar ; Lee, Yong Min ; MacFarlane, Douglas R. ; Wallace, Gordon G. ; Officer, David L. / Energy efficient electrochemical reduction of CO2 to CO using a three-dimensional porphyrin/graphene hydrogel. In: Energy and Environmental Science. 2019 ; Vol. 12, No. 2. pp. 747-755.
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Choi, J, Kim, J, Wagner, P, Gambhir, S, Jalili, R, Byun, S, Sayyar, S, Lee, YM, MacFarlane, DR, Wallace, GG & Officer, DL 2019, 'Energy efficient electrochemical reduction of CO2 to CO using a three-dimensional porphyrin/graphene hydrogel', Energy and Environmental Science, vol. 12, no. 2, pp. 747-755. https://doi.org/10.1039/c8ee03403f

Energy efficient electrochemical reduction of CO2 to CO using a three-dimensional porphyrin/graphene hydrogel. / Choi, Jay; Kim, Jeonghun; Wagner, Pawel; Gambhir, Sanjeev; Jalili, Rouhollah; Byun, Seoungwoo; Sayyar, Sepidar; Lee, Yong Min; MacFarlane, Douglas R.; Wallace, Gordon G.; Officer, David L.

In: Energy and Environmental Science, Vol. 12, No. 2, 01.02.2019, p. 747-755.

Research output: Contribution to journalArticleResearchpeer-review

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