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Issue 22, 2012
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Mixed-phase PdRu bimetallic structures with high activity and stability for formic acid electrooxidation

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Abstract

Aiming at investigating the effect of structure on electrocatalytic properties, Pd50Ru50 nanoparticles (NPs) with three different structures were carefully designed in a one-pot polyol process for application in formic acid electrooxidation. The three structures are: (1) single-phase PdRu nanodendrites (denoted as PR-1), (2) a mixed-phase mixture of PdRu nanodendrites and monometallic Ru NPs (denoted as PR-2), and (3) a mixed-phase mixture of monometallic Pd and Ru NPs (denoted as PR-3). From PR-1 to PR-3, the structure was varied from single-phase to mixed-phase. The relative position of Ru was altered from completely Pd-connected (PR-1), to a mixture of Pd-connected and monometallic (PR-2), and completely monometallic (PR-3). All PdRu NPs outperform the commercial Pd/C. PR-2 exhibits the highest peak current density, but its stability is slightly lower than that of PR-3. When both the current density and the durability are taken into consideration, PR-2 is the best choice of catalyst for formic acid oxidation. It indicates that both the Pd-connected Ru NPs and monometallic Ru NPs in the mixed-phase PR-2 are essential to improve the electrocatalytic properties. Our study also illustrates that the electrochemical active surface area (ECSA) and hydrogen storage capacity of the as-prepared PdRu NPs are greatly enhanced after several hundred scans in formic acid, indicating the possibility for highly restorable catalysts in direct formic acid fuel cells.

Graphical abstract: Mixed-phase PdRu bimetallic structures with high activity and stability for formic acid electrooxidation

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Publication details

The article was received on 21 Feb 2012, accepted on 16 Apr 2012 and first published on 16 Apr 2012


Article type: Paper
DOI: 10.1039/C2CP40536A
Citation: Phys. Chem. Chem. Phys., 2012,14, 8051-8057
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    Mixed-phase PdRu bimetallic structures with high activity and stability for formic acid electrooxidation

    D. Wu, Z. Zheng, S. Gao, M. Cao and R. Cao, Phys. Chem. Chem. Phys., 2012, 14, 8051
    DOI: 10.1039/C2CP40536A

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