Tuning Catalytic Activity in Ultrathin Bimetallic Nanowires via Surface Segregation: Some Insights

Shetty, S and Gayen, M and Agarwal, S and Chatterjee, D and Singh, A and Ravishankar, N (2022) Tuning Catalytic Activity in Ultrathin Bimetallic Nanowires via Surface Segregation: Some Insights. In: Journal of Physical Chemistry Letters . pp. 770-776.

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Abstract

The efficiency of heterogeneous catalysts critically depends on the nature of the surface. We present results on controlling the composition in ultrathin bimetallic AuPd. AuPd wires were grown using Au nanowire templates; the surface composition could be tuned by increasing the amount of Pd. Further, segregation of Pd to the surface could be induced in alloyed nanowires by annealing under a controlled CO atmosphere. Electrocatalytic activity of these bimetallic systems is assessed for the methanol oxidation reaction (MOR). While the MOR potential shows a monotonic increase with Pd content, the specific activity displays a typical volcano-type behavior. The CO-annealed nanowires show a lowering of potential owing to a higher Pd content on the surface while still maintaining the specific activity. These findings provide clear strategies to independently control the reaction potential and the activities of nanocatalysts. The experimental findings are well supported by the theoretical investigations using density functional theory (DFT) calculations. © 2022 American Chemical Society.

Item Type:	Journal Article
Publication:	Journal of Physical Chemistry Letters
Publisher:	American Chemical Society
Additional Information:	The copyright for this article belongs to American Chemical Society
Keywords:	Binary alloys; Catalyst activity; Density functional theory; Gold alloys; Nanocatalysts; Palladium; Palladium alloys; Surface segregation, Au nanowires; Bimetallic systems; Bimetallics; CO atmosphere; Electrocatalytic activity; Heterogeneous catalyst; Methanol oxidation reactions; Reaction potential; Specific activity; Ultra-thin, Nanowires
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	14 Feb 2022 15:38
Last Modified:	14 Feb 2022 15:38
URI:	http://eprints.iisc.ac.in/id/eprint/71342

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