Composition-tuned porous Pd-Ag bimetallic dendrites for the enhancement of ethanol oxidation reactions

Porous Pd-Ag bimetallic dendrites of various compositions were prepared using a galvanic replacement reaction between Ag dendrites and Pd(NO3)2, in which the compositional variation could be effectively controlled by adjusting the concentration of Pd(NO3)2. The structural and morphological results r...

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Bibliographic Details
Published in:Journal of alloys and compounds 2016-12, Vol.688, p.447-453
Main Authors: Jo, Yu-Geun, Kim, Sung-Min, Kim, Jung-Wan, Lee, Sang-Yul
Format: Article
Language:English
Subjects:
Ethanol oxidation reaction
Galvanic replacement
Palladium nitrate
Pd-Ag bimetallic porous dendrites
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Summary:Porous Pd-Ag bimetallic dendrites of various compositions were prepared using a galvanic replacement reaction between Ag dendrites and Pd(NO3)2, in which the compositional variation could be effectively controlled by adjusting the concentration of Pd(NO3)2. The structural and morphological results revealed that the Ag-rich bimetallic dendrites had hollow structures with porous surface layers, whereas the Pd-rich bimetallic dendrite structures collapsed into large aggregates composed of Pd fragments. The electrochemical measurements for the ethanol oxidation revealed that in terms of electrocatalytic activity, the Pd40Ag60 bimetallic dendrites were superior to the other Pd-Ag catalysts. This could be attributed to the geometric and electronic effects of the porous Pd-Ag bimetal dendritic structure. [Display omitted] •Porous Pd-Ag dendrites were obtained using a galvanic replacement reaction.•A galvanic replacement reaction was conducted using a Pd(NO3)2 precursor.•The composition of the Pd-Ag was tuned by adjusting the Pd(NO3)2 concentration.•The Pd40Ag60 catalyst showed the highest activity for the EOR.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2016.07.227