Polymer-metal complexes as emerging catalysts for electrochemical reduction of carbon dioxide

A class of metal-doped polyanilines (PANIs) was synthesized and investigated as electrocatalysts for the carbon dioxide reduction reaction (CO 2 RR). These materials show good affinity for the electrode substrate and allow to obtain stable binder-free electrodes, avoiding the utilization of expensiv...

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Bibliographic Details
Published in:Journal of applied electrochemistry 2021-09, Vol.51 (9), p.1301-1311
Main Authors: Sassone, Daniele, Zeng, Juqin, Fontana, Marco, Sacco, Adriano, Farkhondehfal, M. Amin, Periolatto, Monica, Pirri, Candido F., Bocchini, Sergio
Format: Article
Language:English
Subjects:
Additives
Carbon dioxide
Cations
Chemical reduction
Chemistry
Chemistry and Materials Science
Conducting polymers
Coordination compounds
Copper
Electrocatalysts
Electrochemistry
Electrosynthesis
Industrial Chemistry/Chemical Engineering
Ionomers
Manganese
Physical Chemistry
Polyanilines
Research Article
Selectivity
Single atom catalysts
Substrates
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Summary:A class of metal-doped polyanilines (PANIs) was synthesized and investigated as electrocatalysts for the carbon dioxide reduction reaction (CO 2 RR). These materials show good affinity for the electrode substrate and allow to obtain stable binder-free electrodes, avoiding the utilization of expensive ionomer and additives. The emeraldine-base polyaniline (EB-PANI), in absence of metal dopant, shows negligible electrocatalytic activity and selectivity toward the CO 2 RR. Such behavior significantly improves once EB-PANI is doped with an appropriate cationic metal (Mn, Cu or Sn). In particular, the Sn-PANI outperforms other metal-doped samples, showing a good turnover frequency of 72.2 h −1 for the CO 2 RR at − 0.99 V vs the reversible hydrogen electrode and thus satisfactory activity of metal single atoms. Moreover, the Sn-PANI also displays impressive stability with a 100% retention of the CO 2 RR selectivity and an enhanced current density of 4.0 mA cm −2 in a 10-h test. PANI, a relatively low-cost substrate, demonstrates to be easily complexed with different metal cations and thus shows high tailorability. Complexing metal with conductive polymer represents an emerging strategy to realize active and stable metal single-atom catalysts, allowing efficient utilization of metals, especially the raw and precious ones. Graphic abstract
ISSN:0021-891X
1572-8838
DOI:10.1007/s10800-021-01585-7