American Chemical Society
Browse

One-Pot Synthesis of Monodisperse 5 nm Pd–Ni Nanoalloys for Electrocatalytic Ethanol Oxidation

Download (784.37 kB)
journal contribution
posted on 2012-08-22, 00:00 authored by Kyungwon Lee, Shin Wook Kang, Su-Un Lee, Kyu-Hwan Park, Young Wook Lee, Sang Woo Han
Highly monodisperse 5 nm Pd–Ni alloy nanoparticles (NPs) were prepared by the reduction of Pd­(acac)2/Ni­(acac)2 mixtures with tert-butylamine-borane complex (TBAB) in the presence of oleic acid (OA) and oleylamine (OAm). Employing TBAB as an effective reductant and OA/OAm combination as an effective stabilizing agent is crucial to the formation of monodisperse Pd–Ni NPs. Experimental results collectively verify that the Pd–Ni alloy NPs form through the sequential nucleation-interdiffusion process and the simultaneous reduction of both metal precursors by the one-pot protocol is the key to the formation of homogeneous NPs. The Pd–Ni NPs were well-dispersed on carbon supports and chemically dealloyed after acetic acid washing through the selective dissolution of the less noble Ni component. The Pd–Ni NP catalysts exhibited much higher electrocatalytic activity and stability for ethanol oxidation than those of a commercial Pd/C catalyst.

History