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Hierarchically 3D Porous Ag Nanostructures Derived from Silver Benzenethiolate Nanoboxes: Enabling CO2 Reduction with a Near-Unity Selectivity and Mass-Specific Current Density over 500 A/g
journal contribution
posted on 2020-03-24, 16:08 authored by Sasitha
C. Abeyweera, Jie Yu, John P. Perdew, Qimin Yan, Yugang SunSilver nanostructures
with hierarchical porosities of multiple
length scales have been synthesized through electrochemical reduction
of silver benzenethiolate nanoboxes. The porous Ag nanostructures
exhibit superior catalytic performance toward electrochemical reduction
of CO2. The Faradaic efficiency of reducing CO2 to CO can be close to 100% at high cathodic potentials, benefiting
from the readsorbed benzenethiolate ions on the Ag surface that can
suppress the hydrogen evolution reaction (HER). Density functional
theory calculations using the SCAN functional reveal that the disfavored
H binding on the benzenethiolate-modified Ag surface is responsible
for inhibiting the HER. The mass-specific activity of CO2 reduction can be over 500 A/g because the multiple-scale porosities
maximize the diffusion of reactive species to and away from the Ag
surface. The unique multiscale porosities and surface modification
of the as-synthesized Ag nanostructures make them a class of promising
catalysts for electrochemical reduction of CO2 in protic
electrolytes to achieve maximum activity and selectivity.
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CO 2 reductionreadsorbed benzenethiolate ionsEnabling CO 2 Reductionhydrogen evolution reactionCO 2Hierarchically 3 D Porous Ag Nanostructures DerivedAg nanostructures exhibitHERSilver Benzenethiolate NanoboxesSCANsilver benzenethiolate nanoboxesbenzenethiolate-modified Ag surfaceporositieAg surfaceas-synthesized Ag nanostructureselectrochemical reduction
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