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Updated: Aug 5, 2026

A Facile Synthetic Method to Obtain Bismuth Oxyiodide Microspheres Highly Functional for the Photocatalytic Processes of Water Depuration
Published on: March 29, 2019
Atomically Dispersed Pd Promotes Water Activation and Electrochemical CO2 Reduction to Formate on Bismuth Catalysts
Wenjing Tian1, Fei Fan1, Hui-Zi Huang1
1Beijing Key Laboratory of Intelligent Molecular Materials and High-Throughput Manufacturing, Ministry of Education Key Laboratory of Cluster Science, Advanced Technology Research Institute (Jinan), Frontiers Science Center for High Energy Material, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, P. R. China.
Abstract:
Electrocatalytic CO2 reduction reaction (CO2RR) offers a sustainable route for converting CO2 into value-added chemicals, but its efficiency is limited by sluggish kinetics and poor selectivity. Herein, we report the controlled synthesis of atomically dispersed Pd-modified Bi nanosheets (Pd2.5%-Bi NSs) via a solvent-guided solvothermal method followed by in situ electroreduction. Solvent engineering regulates the morphology of Bi2O3 precursors, resulting in Bi NSs with a high electrochemically active surface area. The incorporation of Pd optimizes the electronic structure, enhances the adsorption of the *OCHO intermediate, and lowers the energy barrier for CO2RR. Notably, atomically dispersed Pd sites facilitate H2O dissociation to provide sufficient active hydrogen, thereby accelerating the protonation kinetics in CO2RR. As a result, Pd2.5%-Bi NSs deliver a current density of 287 mA cm-2 at -1.0 V versus the reversible hydrogen electrode, while maintaining a high formate Faradaic efficiency (FEformate, >91.0%) over a wide current density range of 50-300 mA cm-2, with a maximum FEformate of 95.7% at 200 mA cm-2 in an alkaline flow cell. These results highlight the synergistic effects of moderate morphological control and atomic-level Pd incorporation, providing insights for the rational design of efficient CO2RR catalysts toward selective formate production.
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