Extrinsic hydrophobicity-controlled silver nanoparticles as efficient and stable catalysts for CO2 electrolysis

Young-Jin Ko, Chulwan Lim, Junyoung Jin, Min Gyu Kim, Ji Yeong Lee, Tae-Yeon Seong, Kwan-Young Lee, Byoung Koun Min, Jae-Young Choi, Taegeun Noh, Gyu Weon Hwang (), Woong Hee Lee () and Hyung-Suk Oh ()
Additional contact information
Young-Jin Ko: Korea Institute of Science and Technology (KIST)
Chulwan Lim: Korea Institute of Science and Technology (KIST)
Junyoung Jin: Korea Institute of Science and Technology (KIST)
Min Gyu Kim: Pohang Accelerator Laboratory (PAL)
Ji Yeong Lee: Korea Institute of Science and Technology (KIST)
Tae-Yeon Seong: Korea University
Kwan-Young Lee: Korea University
Byoung Koun Min: Korea Institute of Science and Technology (KIST)
Jae-Young Choi: Sungkyunkwan University (SKKU)
Taegeun Noh: LG Chem Ltd.
Gyu Weon Hwang: Korea Institute of Science and Technology (KIST)
Woong Hee Lee: Korea Institute of Science and Technology (KIST)
Hyung-Suk Oh: Korea Institute of Science and Technology (KIST)

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract To realize economically feasible electrochemical CO2 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 CO2 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 CO2 is maintained in the catalytic region of several hundred nanometers, with the smooth formation of a triple phase boundary, which facilitate the occurrence of CO2RR instead of HER. We analyze catalyst degradation and cathode flooding during CO2 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 CO2 electrolysis.

Date: 2024
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DOI: 10.1038/s41467-024-47490-3

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