Please use this identifier to cite or link to this item: http://lib.jncasr.ac.in:8080/jspui/handle/10572/2123
Title: Enhanced Intrinsic Activity and Stability of Au-Rh Bimetallic Nanostructures as a Supportless Cathode Electrocatalyst for Oxygen Reduction in Alkaline Fuel Cells
Authors: Narayanamoorthy, B.
Balaji, S.
Sita, C.
Pasupathi, S.
Eswaramoorthy, M.
Moon, Il-Shik
Keywords: Chemistry
Engineering
Au-Rh
Supportless electrocatalyst
Durability
Oxygen reduction
KOH
Core-Shell Electrocatalysts
Polyketone Nanoball Core
Carbon Nitride Shell
One-Step Synthesis
Gold Nanoparticles
Electrochemical Reduction
Durable Electrocatalysts
Methanol Oxidation
Dioxygen Reduction
Facile Synthesis
Issue Date: 2016
Publisher: American Chemical Society
Citation: Narayanamoorthy, B.; Balaji, S.; Sita, C.; Pasupathi, S.; Eswaramoorthy, M.; Moon, I. S., Enhanced Intrinsic Activity and Stability of Au-Rh Bimetallic Nanostructures as a Supportless Cathode Electrocatalyst for Oxygen Reduction in Alkaline Fuel Cells. Acs Sustainable Chemistry & Engineering 2016, 4 (12), 6480-6490 http://dx.doi.org/10.1021/acssuschemeng.6b01257
ACS Sustainable Chemistry & Engineering
4
12
Abstract: The electroreduction of dioxygen on supportless Au-Rh bimetallic nanostructures (Au-Rh NSs) synthesized by a surfactant template-free, single step chemical reduction method occurred with high intrinsic activity in an alkaline medium. Cyclic voltammetry and linear scan voltammetry together with X-ray diffraction and high-resolution electron microscopy showed that the improved performance of the Au-Rh NSs toward dioxygen reduction could be due to the synergistic electronic effects of nanobimetallic combination and its clusterlike morphology. The electrochemically active surface area (ECSA) was estimated to be 37.2 m(2) g(-1) for supportless Au-Rh NS with a 3:1 atomic composition, which was higher than that reported for Ag-based nanocatalysts. The intrinsic activities (IA) of the supportless and carbon supported Au-Rh (3:1) NSs were 3.2S and 3.0 mA/cm(2), respectively, which were higher than those of the standard Pt/C (0.1 mA/cm(2))(45) Au/C catalysts for the oxygen reduction reaction (ORR). Oxygen reduction on both catalysts followed a direct four electron pathway. The accelerated durability test carried out by continuous potential cycling showed that the 3:1 ratio of Au-Rh nanostructures had excellent stability with a 20% increase in ECSA after 10 000 potential cycles, highlighting their potential application for real systems.
Description: Open Access (Accepted Manuscript)
URI: http://hdl.handle.net/10572/2123
ISSN: 2168-0485
Appears in Collections:Research Articles (Eswaramoorthy M.)

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