Porously Reduced 2-Dimensional Bi2O2CO3 Petals for Strain-Mediated Electrochemical CO2 Reduction to HCOOH

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外文摘要：Here we introduce bismuth-based catalysts for the efficient electrochemical reduction of CO2 to formic acid(HCOOH),which are composed of petal-shaped Bi2O2CO3(BOC)that spontaneously formed from Bi thin film in aqueous carbonate solution at room temperature.During the electrochemical reduction process,the BOC petals transform to reduced BOC(R-BOC)consisting of individual BOC and Bi domains.Lattice mismatch between both domains induces biaxial strain at the interfaces.Density functional theory calculations suggest that the tensile strain on the Bi domain stabilizes the*OCHO intermediate,reducing the thermodynamic barrier toward CO2 conversion to HCOOH.Together with the thermodynamic benefit and the unique nanoporous petal-shaped morphology,R-BOC petals have a superior Faradaic efficiency of 95.9％at-0.8 VRHE for the electrochemical conversion of CO2 to HCOOH.This work demonstrates that the spontaneously formed binary phases with desirable lattice strain can increase the activity of bismuth catalysts to the CO2 reduction reaction;such a strategy can be applicable in design of various electrocatalysts.

外文关键词：

bismuthcarbon dioxide reductionformic acidheterointerfacesstrain

作者：

Won Seok Cho、Dae Myung Hong、Wan Jae Dong、Tae Hyung Lee、Chul Jong Yoo、Donghwa Lee、Ho Won Jang、Jong-Lam Lee

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作者单位：

Department of Materials Science and Engineering,Pohang University of Science and Technology(POSTECH),Pohang Gyungbuk 37673,Korea

Department of Materials Science and Engineering Research Institute of Advanced Materials,Seoul National University,Seoul 08826,Korea

出版年：

2024

DOI：

10.1002/eem2.12490

能源与环境材料(英文)

ISSN：

年,卷(期)：2024.7(1)