Enhanced electro-catalytic activity of palladium nanocoral structures with platinum incorporation

Radhakrishnan, T and Nampoothiri, KN and Sandhyarani, N (2020) Enhanced electro-catalytic activity of palladium nanocoral structures with platinum incorporation. In: Electrochimica Acta, 340 .

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Abstract

One of the most vital problems in fuel cell research is the synthesis of low cost, active and stable electro-catalyst for anodic and cathodic reactions. In this work, palladium nanostructures with a coral-like morphology (PdNC) is deposited on reduced graphene oxide (rGO) by electrochemical method. The nanocoral exhibits superior activity towards methanol oxidation (MOR) and oxygen reduction reactions (ORR) in alkaline media. To improve the efficiency, Pt is deposited on the surface by galvanic replacement. Presence of Pt on palladium nanocoral (PdNC-Pt) leads to an enhanced catalytic activity for both the electrode reactions. A mass activity of 1700 mA mg� 1 at 1.04 V for MOR and a current density of �5.72 mA cm� 2 and an onset potential of 0.86 V vs RHE is observed for ORR. Both the electrode reactions result in higher current than the commercial Pd/C and Pt/C catalysts. A remarkable improvement in durability is seen for ORR after depositing Pt.

Item Type:	Journal Article
Publication:	Electrochimica Acta
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Additional Information:	The copyright of this article belongs to PERGAMON-ELSEVIER SCIENCE LTD
Keywords:	Catalyst activity; Direct methanol fuel cells (DMFC); Electrodes; Electrolytic reduction; Graphene; Methanol; Methanol fuels; Morphology; Oxygen reduction reaction; Palladium; Palladium compounds; Platinum; Reduced Graphene Oxide, Electrocatalytic activity; ELectrochemical methods; Electrode reactions; Enhanced catalytic activity; Galvanic replacements; Methanol oxidation reactions; Nanocoral; Reduced graphene oxides (RGO), Nitrogen compounds
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	26 Jun 2020 09:12
Last Modified:	26 Jun 2020 09:12
URI:	http://eprints.iisc.ac.in/id/eprint/64856

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