Novel-Phase Structural High-Efficiency Anode Catalyst for Methanol Fuel Cells: alpha-(NiCu)(3)Pd Nanoalloy

作者：Wen Ming^*; Zhou Bo; Fang Hao; Wu Qingsheng; Chen Shipei

来源：Journal of Physical Chemistry C, 2014, 118(46): 26713-26720.

DOI：10.1021/jp507138z

An approach has been explored to highly improve the catalytic activity and stability for methanol oxidation reaction (MOR) by using dominant alpha-(NiCu)(3)Pd phase-structural NiCuPd nanoparticles (NPs) as anode catalysts. The NiCuPd alloy NPs are monodispersed with the diameter of similar to 10 nm and have been prepared by the reduction of Pd(acac)(2), Ni(acac)(2), and Cu(acac)(2) following alloying growth process. In the NiCuPd alloy system, Ni atoms fused in Cu3Pd phase to form alpha-(NiCu)(3)Pd phase together with NiCuPd solid solution phase. As Ni concentration gradually enriched, the crystallinity of alpha-(NiCu)(3)Pd became higher, while its percentage decreased by one degree. Owing to the synergistic effect between components and facet atom arrangement, the catalytic activity and stability of NiCuPd NPs can be adjusted toward the MOR in alkaline media. The maximized crystallinity of alpha-(NiCu)(3)Pd results in the largest catalytic activity. Compared with commercial Pd/C with (111) facets, alpha-(NiCu)(3)Pd phase with (117) facets afforded a more open-atom arrangement surface and exhibited the remarkable catalytic activity and stability. Containing maximized crystallinity of alpha-(NiCu)(3)Pd, Ni63Cu12Pd25 NP-modified electrode, afforded the highest catalytic activity (333 mA.mg(1)) toward the MOR, which is about 2.5 times higher than that of the commercial Pd/C-modified one (145 mA.mg(1)). Combining the advantages of high electrochemical activity, stability, and economical effectiveness, the novel phase of alpha-(NiCu)(3)Pd has great potential as an anode catalyst for methanol fuel cells.

• 出版日期2014-11-20
• 单位同济大学