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Rational geometrical engineering of palladium sulfide multi-arm nanostructures as a superior bi-functional electrocatalyst

Abstract

Geometrical tunability offers sharp edges, open armed structure accompanied with high electrochemical active surface area ensure the efficient and effective utilization of materials by exposing the electrochemical active sites for facile accessibility of reactant species. Here, we report one-step, single-pot, surfactant-free, electroless and economic route to synthesize palladium sulfide nanostructures with different geometry at mild temperature and their catalytic properties towards oxygen reduction reaction (ORR) and methanol electro-oxidation (MOR). For ORR, the positive on-set, half wave potentials, smaller Tafel slope, high electrochemical active surface are, large roughness factor and better cyclic stability as compared to commercial state-of-the-art Pt-C/PdS catalyst, suggests the superiority of the catalyst in alkaline medium. In addition, the high mass activity (Jf∼ 715 mA mg−1 ) in comparison with commercial state-of-the-art Pt-C/PdS catalysts (Jf∼ 138 &41 mA mg−1, respectively), high Jf/Jb (1.52) in consort with the superior operational stability of multi-arm palladium sulfide nanostructures towards MOR as well advocates the bi-functional behavior of catalyst and its potential as promising Pt-free anode/cathode electrocatalysts in fuel cells.

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Publication details

The article was received on 30 Jun 2017, accepted on 01 Aug 2017 and first published on 03 Aug 2017


Article type: Paper
DOI: 10.1039/C7NR04733A
Citation: Nanoscale, 2017, Accepted Manuscript
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    Rational geometrical engineering of palladium sulfide multi-arm nanostructures as a superior bi-functional electrocatalyst

    R. Nandan and K. K. Nanda, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR04733A

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