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Issue 29, 2017
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Enhancement in kinetics of the oxygen reduction on a silver catalyst by introduction of interlaces and defect-rich facets

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Abstract

Controlling the nanostructure of a metallic catalyst has become an efficient strategy to tune and to optimize its catalytic properties for electrochemical reactions. Reported herein is a unique nanoporous silver (np-Ag) structure, a multigrain, whose surface is predominantly enclosed by interlaced facets and thus defect-enriched surfaces. The synthesis is accomplished by a simple and efficient method involving hydrothermal treatment of a composite containing Ag+ ions and reduced-polyoxometalate nanoclusters. Experimental results show that the novel np-Ag catalyst can electrocatalyze the oxygen reduction reaction (ORR) with mass (6.90 mA mg−1Ag) and specific (0.068 mA cm−2Ag) activities are enhanced 16.2 and 15.1 times relative to those of the Ag/C catalyst (0.425 mA mg−1Ag and 0.0045 mA cm−2Ag, respectively). The catalysts' excellent catalytic performance originates from the increased availability of surface active defects and the features of the porous structure. It is anticipated that this work will offer a new approach to surface-controlled synthesis and ORR catalysts design.

Graphical abstract: Enhancement in kinetics of the oxygen reduction on a silver catalyst by introduction of interlaces and defect-rich facets

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Publication details

The article was received on 16 Apr 2017, accepted on 03 Jul 2017 and first published on 05 Jul 2017


Article type: Paper
DOI: 10.1039/C7TA03287K
Citation: J. Mater. Chem. A, 2017,5, 15390-15394
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    Enhancement in kinetics of the oxygen reduction on a silver catalyst by introduction of interlaces and defect-rich facets

    X. Xie, M. Wei, L. Du, Y. Nie, X. Qi, Y. Shao and Z. Wei, J. Mater. Chem. A, 2017, 5, 15390
    DOI: 10.1039/C7TA03287K

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