Efficient electrocatalytic CO 2 reduction using a polyaniline|gold nanoparticle core-shell nanofiber modified electrode Tzu-Hsuan Wang, Chia-Yu Lin, Yu-Cheng Huang, and Chia-Ying Li National Cheng Kung University, Taiwan Electrochemical CO 2 reduction ( e -CO 2 RR) into valuable chemicals has been considered as a promising approach towards the carbon-neutral economy. The development of facile and scalable electrosynthetic method to prepare electrocatalysts with high activity and selectivity is therefore of great importance. In this work, we report on the core-shell-structured polyaniline|gold nanoparticles nano fiber (nanoPANI|Au) with high activity and selectivity towards e -CO 2 RR.nanoPANI|Au was prepared by the electrodeposition, and its growth mechanism was thoroughly investigated. We found that the applied current used for the electrosynthesis of nanoPANI|Au played an important role in determining the structure, size, and electrochemically-available surface area of deposited polyaniline and gold. Under optimal conditions, the prepared nanoPANI|Aumodified electrode showed a satisfactory selectivity (Faradaic efficiency: 70.0 ± 2.1%) towards the generation of CO from e -CO 2 RR with a high turnover frequency of 0.40 ± 0.02 s -1 and a CO-mass activity of 5.67 ± 0.31 A g -1 at a moderate over potential of 0.59 V in NaHCO 3 (0.1 M). This work opens a new avenue for the preparation of core-shell-structured conducting polymer|metal nanoparticles as the electrocatalysts for e -CO 2 RR.
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© The Author(s), 2023
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