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2011 IMAPS New England Technical Symposium Best Student Paper Award

Xi Geng won Best Student Paper Award in IMAPS New England Technical Symposium

Congratulations! Xi Geng won Best Student Paper Award in IMAPS New England Technical Symposium, May 3, 2011, Boxborogh, MA. His paper advised by Prof. Jianyu Liang is titled "In-Situ Synthesis and Characterization of PEI/MWCNTs Supported PtRu Electrocatalyst for Methanol Oxidation". Below is the abstract of his paper.

In-Situ Synthesis and Characterization of PEI/MWCNTs Supported PtRu Electrocatalyst for Methanol Oxidation

Xi Geng, Prof. Jianyu Liang

Abstract: In the present work, PtRu bimetallic nanoparticles (NPs) were successfully assembled on polyethyleneimine (PEI) functionalized multi-walled carbon nanotubes (MWCNTs) via an effective and facile polyol reduction approach. During the synthesis, the amine and imine groups in polycationic PEI provided anchoring sites for the noble metal ions, and thus facilitated the in-situ deposition of PtRu nanocrystals on MWCNTs. Noncovalent surface modification of MWCNTs with PEI was confirmed by FTIR and Zeta-potential measurement. The morphology, crystalline structure and composition of the hybrid material was characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray powder diffraction (XRD) and energy dispersive X-ray spectroscopy (EDX), respectively. According to SEM and TEM observations, PtRu NPs with small particle size and narrow size distribution were successfully synthesized on PEI-MWCNTs. Cyclic voltammetry tests demonstrated that PtRu/PEI-MWCNTs had large electrochemical surface area and exhibited enhanced electrocatalytic activity towards methanol oxidation in comparison with using acid oxidized-MWCNTs (O-MWCNTs) as catalyst support under the same PtRu loading condition. The superior electrocatalysis properties of the PtRu/PEI-MWCNTs nanocomposite could be attributed to the fine grain size and high dispersion of PtRu NPs in the presence of PEI. These results indicated that PEI-functionalized CNTs maybe a useful building block for the deposition of Pt-based bimetallic electrocatalyst, which has great potential for applications such as direct methanol fuel cell (DMFC).

June 3, 2011