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Treelike Two-level PdxAgy Nanocrystals Tailored for Bifunctional Fuel Cell Electrocatalysis

Abstract

Pd-based alloy catalysts have been extensively investigated as the anodic and cathodic catalysts of the direct formic acid fuel cells (DFAFCs) in virtues of their unique synergistic effect, good stability and relatively low cost compared with Pt-base alloy catalysts. Controlling the structure and morphology of nanocatalysts is of great significance to tune and boost their electrocatalytic performance. Herein, we propose a simple, rapid and green approach to fabricate tree-like PdAg nanocrystals with tunable chemical composition (PdxAgy NTs) via mixing the metal precursors and 1-naphthol, and then aging for mere 30 min under 60 oC. The obtained PdxAgy NTs feature two-level structure of tiny Pd1Ag1 alloy nanodendrites and Pd1Ag2 alloy nanobranches with abundant active sites and enhanced structural stability. The formation mechanism of PdxAgy NTs has been investigated well via a series of control experiments, which is just like the germination and growth of a tree. To the best of our knowledge, treelike two-level PdxAgy nanostructures have never been reported before. The electrochemical measurements demonstrate that the Pd3Ag1 NTs outperform commercial Pd black and other compositional Pd1Ag1 and Pd1Ag3 NTs in the aspect of bifunctional activity and stability towards the anodic formic acid oxidation and cathodic oxygen reduction of the DFAFCs.

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Publication details

The article was received on 30 Nov 2018, accepted on 04 Jan 2019 and first published on 05 Jan 2019


Article type: Paper
DOI: 10.1039/C8TA11538A
Citation: J. Mater. Chem. A, 2019, Accepted Manuscript
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    Treelike Two-level PdxAgy Nanocrystals Tailored for Bifunctional Fuel Cell Electrocatalysis

    X. Jiang, Y. Xiong, Y. Wang, J. Wang, N. Li, J. Zhou, G. Fu, D. Sun and Y. Tang, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C8TA11538A

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