Nanoporous palladium fabricated from an amorphous Pd_42.5Cu₃₀Ni_7.5P₂₀ precursor and its ethanol electro-oxidation performance

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• 作者：Zhenhua Dan ; Fengxiang Qin ; Takeshi Wada ; Shin-ichi Yamaura ; Guoqiang Xie ; Yu Sugawara ; Izumi Muto ; Akihiro Makino ; Nobuyoshi Hara
• 关键词：Nanoporous palladium ; Amorphous precursor ; Dealloying ; Fuel cell ; Ethanol oxidation
• 刊名：Electrochimica Acta
• 出版年：2013
• 出版时间：1 October, 2013
• 年：2013
• 卷：108
• 期：Complete
• 页码：512-519
• 全文大小：2897 K

文摘

A fcc nanoporous palladium (NP Pd) with a pore size of ¡«2 nm and ligament size of ¡«4 nm is obtained after electrochemical dealloying an amorphous Pd_42.5Cu₃₀Ni_7.5P₂₀ precursor in a 0.1 mol dm^?3 H₂SO₄ solution at constant current densities of 17 mA cm^?2 for 12 ks. A nanoporous Pd-P solid solution forms at lower currents. The cyclic voltammetry results reveal that NP Pd has a superior ethanol oxidation ability, about 20 times higher oxidation current than bulk Pd in the alkaline conditions. This can be attributed to the small pore sizes and fine ligaments of the NP Pd electro-catalysis.