法拉第效率
电解
阴极
电解质
催化作用
材料科学
化学工程
电化学
电流密度
阳极
分解水
法拉第电流
纳米颗粒
电解水
氢
电极
纳米技术
化学
电极电位
物理化学
有机化学
工程类
生物化学
物理
量子力学
光催化
作者
Young‐Jin Ko,Chulwan Lim,Junyoung Jin,Min Kim,J.Y. Lee,Tae‐Yeon Seong,Kwan‐Young Lee,Byoung Koun Min,Jae‐Young Choi,Tae-Geun Noh,Gyu Weon Hwang,Woong Hee Lee,Hyung Suk Oh
标识
DOI:10.1038/s41467-024-47490-3
摘要
Abstract To realize economically feasible electrochemical CO 2 conversion, achieving a high partial current density for value-added products is particularly vital. However, acceleration of the hydrogen evolution reaction due to cathode flooding in a high-current-density region makes this challenging. Herein, we find that partially ligand-derived Ag nanoparticles (Ag-NPs) could prevent electrolyte flooding while maintaining catalytic activity for CO 2 electroreduction. This results in a high Faradaic efficiency for CO (>90%) and high partial current density (298.39 mA cm ‒2 ), even under harsh stability test conditions (3.4 V). The suppressed splitting/detachment of Ag particles, due to the lipid ligand, enhance the uniform hydrophobicity retention of the Ag-NP electrode at high cathodic overpotentials and prevent flooding and current fluctuations. The mass transfer of gaseous CO 2 is maintained in the catalytic region of several hundred nanometers, with the smooth formation of a triple phase boundary, which facilitate the occurrence of CO 2 RR instead of HER. We analyze catalyst degradation and cathode flooding during CO 2 electrolysis through identical-location transmission electron microscopy and operando synchrotron-based X-ray computed tomography. This study develops an efficient strategy for designing active and durable electrocatalysts for CO 2 electrolysis.
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