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Are We Underrating Rare-Earth as an Electrocatalyst?- The Effect of their Substitution in Palladium Nanoparticles Enhances the Activity towards Ethanol Oxidation Reaction

Abstract

Ever since the advent of catalysis, transition metal-based materials are continually being exploited as efficient electrocatalysts while rare-earths (RE) are neglected due to their misleading name “Rare-Earth” and cost. In fact, most of the REs are abundant and less expensive than the most explored transition metals. In view of this, we tried to study the chemical effect of small amount of RE (10%) substitution in Pd lattice (REPd) in comparison with transition metals substituted Pd (TMPd) towards ethanol oxidation reaction (EOR). The electrochemical activity of REPd (RE = Eu, Yb) towards EOR was found to show many fold increase in both specific and mass activities compared to TMPd (TM = Cr, Ni) and commercial Pd/C. Theoretical investigations assisted with DFT calculations support the experimental observations with a perfect synergy between the adsorption energy of –OH and –COCH3 to the catalyst surface, which provides an unprecedented catalytic activity for REPd compared to other catalysts. The promotional effect of RE is well exploited in enhancing the activity and stability of Pd towards EOR as observed in the electrochemical studies, X-ray absorption near edge spectroscopy and DFT calculations.

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Publication details

The article was received on 09 Sep 2017, accepted on 13 Oct 2017 and first published on 13 Oct 2017


Article type: Paper
DOI: 10.1039/C7TA07945A
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Are We Underrating Rare-Earth as an Electrocatalyst?- The Effect of their Substitution in Palladium Nanoparticles Enhances the Activity towards Ethanol Oxidation Reaction

    S. Chirambatte Peter, S. C. Sarma, U. Subbarao, Y. Khulbe and R. Jana, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA07945A

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