Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 5, Issue 7, Pages 2752-2760Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am4004478
Keywords
PtAu alloy; polypyrrole nanotubes; electrocatalysts; methanol oxidation; oxygen reduction
Funding
- Natural Science Foundation of China [21274101]
- National Basic Research Program of China (973 Program) [2012CB825800]
- The Natural Science Foundation of Jiangsu Province [BK2011274]
- Research Fund for the Doctoral Program of Higher Education [20103201110003]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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Polypyrrole nanotubes (PPyNTs)/PtAu alloy nanoparticle (NP) hybrids were synthesized in gram-scale by using covalently attached imidazolium moieties as a linker. The approach involves the surface functionalization of PPyNTs with pendant imidazolium moieties (PPyNT-Im), anion-exchange with Pt and Au precursors, and followed by the reduction of metal ions to produce the PtAu alloy NPs on the surface of PPyNTs. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM), and elemental mapping showed that both Pt and Au were atomically distributed in the PtAu alloy NPs without phase segregation. The composition of the PtAu alloy NPs can be simply controlled by adjusting the feed ratio in the metal precursor solution. The electrocatalytic properties of prepared PPyNT-Im-pt(x)Au(y) (the suffixes x and y represent the relative molar ratio of Pt and Au in the feed, respectively) NP hybrids were determined by the composition of alloy NPs. The Pt-rich NP hybrids, PPyNT-Im-Pt8Au2, showed highly electrocatalytic activity and stability toward the methanol oxidation in both acidic and alkaline solutions, whereas the Au-rich NP hybrids, PPyNT-Im-Pt2Au8, showed an enhanced catalytic activity and durability upon oxygen reduction. The present study provided a simple and effective approach for the preparation of PtAu alloy catalysts with controllable composition for high-performance fuel cells and electrochemical sensors.
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