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Article Abstract
BiO species have been identified as the most important active species for the electroreduction of CO to HCOOH over Bi-based materials. However, the BiO species are unstable under high reduction current/potential, limiting further industrial application. Herein, we constructed robust BiO species by incorporating sodion (Na) into Bi nanosheets (denoted as Na-Bi nanosheets). The negatively charged BiO species anchored by the stable Na in Na-Bi nanosheets displayed highly structural stability during CO electroreduction. When the applied current density () was set from -200 to -1200 mA cm, all of the faradaic efficiency (FE) of HCOO (FE) for Na-Bi nanosheets was maintained over 90% in the flow-cell device, whereas the FE for pure Bi nanosheets was dramatically decreased from 90% to 5%. Mechanistic study further revealed that the Na-anchored BiO species can not only alter the potential-limiting step (PLS) but also decrease the energy barrier of the PLS for the electroreduction of CO into HCOOH.
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