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Zone-Specific Crystallization and a Porosity-Directed Scaling Marker for the Catalytic Efficacy of Au–Ag Alloy Nanoparticles
journal contribution
posted on 2019-11-21, 21:49 authored by Sandip
Kumar De, Subrata Mondal, Abhijit Roy, Sourabh Kumar, Manabendra Mukherjee, Sudeshna Das Chakraborty, Pintu Sen, Biswarup Pathak, Biswarup Satpati, Mrinmay Mukhopadhyay, Dulal SenapatiBimetallic Au–Ag hollow nanoprisms (HNPrs) with
variable
effective surface areas, dynamic atomic compositions (Au:Ag), and
distinct stepped surfaces between the central porous region and crystalline
periphery are synthesized through a modified seed-mediated growth
followed by a sacrificial galvanic replacement method. Porous central-cavity-induced
distortion from prism to disk shape generates an increased number
of numerous low-coordinated crystal defects on the crystalline nanodisk
surface along with extended d-orbital spacing of the respective crystal
disorders in the central-cavity region of HNPrs to control their adsorption
efficiency for different redox reactions. Among the different HNPrs,
HNPr250 possesses the highest density of the grain boundary
with a preferable Au0:Ag0 ratio to form an extensive
porous ligamentous central cavity, acts as a superior electrocatalyst
to accelerate the kinetics of the uric acid (UA) oxidation (8.4 times
compared to the blank electrode), and allows us to detect UA even
in the nanomolar range. Experimental observations have been supported
by density functional theory calculation to approximate the effective
Au–Au displacement with a suitable percentage of Ag in different
HNPrs to explain their measured catalytic activity.
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d-orbital spacingcrystal disordersdensitytheory calculationAg 0 ratiosurface areasHNPr 250Porous central-cavity-induced distortiongrain boundaryPorosity-Directed Scaling MarkerZone-Specific CrystallizationExperimental observationsadsorption efficiencynanomolar rangeUAdisk shapecentral-cavity regionlow-coordinated crystal defectsCatalytic Efficacyredox reactionsuric acidnanodisk surfaceseed-mediated growthreplacement method
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