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a) Schematic illustration of the flow‐cell system. b) Plots of potential–time curves with iR‐correction, c) FEHCOOH, and d) Φ HCOOH of Bi@Sn NPs at the j ranging from −25.0 to −250.0 mA cm−2 in 2.0 m KHCO3. e) Durability tests of Bi@Sn NPs in the flow‐cell system at j of −200.0 mA cm−2 for 8 h.
