Direct electrosynthesis of 52% concentrated CO on silver’s twin boundary

Can Tang, Peng Gong, Taishi Xiao and Zhengzong Sun ()
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Can Tang: Fudan University
Peng Gong: Fudan University
Taishi Xiao: Fudan University
Zhengzong Sun: Fudan University

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract The gaseous product concentration in direct electrochemical CO2 reduction is usually hurdled by the electrode’s Faradaic efficiency, current density, and inevitable mixing with the unreacted CO2. A concentrated gaseous product with high purity will greatly lower the barrier for large-scale CO2 fixation and follow-up industrial usage. Here, we developed a pneumatic trough setup to collect the CO2 reduction product from a precisely engineered nanotwinned electrocatalyst, without using ion-exchange membrane. The silver catalyst’s twin boundary density can be tuned from 0.3 to 1.5 × 104 cm−1. With the lengthy and winding twin boundaries, this catalyst exhibits a Faradaic efficiency up to 92% at −1.0 V and a turnover frequency of 127 s−1 in converting CO2 to CO. Through a tandem electrochemical-CVD system, we successfully produced CO with a volume percentage of up to 52%, and further transformed it into single layer graphene film.

Date: 2021
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DOI: 10.1038/s41467-021-22428-1

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