کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1284871 | 973099 | 2010 | 4 صفحه PDF | دانلود رایگان |
An experimentally simple process is reported in aqueous solution and under ambient conditions to prepare highly dispersed and active Pd/C catalyst without the use of a stabilizing agent. The [Pd(NH3)4]2+ ion is synthesized with gentle heating in aqueous ammonia solution without formation of Pd(OH)x complex intermediates. The adsorbed [Pd(NH3)4]2+ on the surface of carbon (Vulcan XC-72) is reduced in situ to Pd nanoparticles by NaBH4. The Pd/C catalyst obtained is characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results show that highly dispersed Pd/C catalyst with 20 wt.% Pd content and with an average Pd nanoparticle diameter of 4.3–4.7 nm could be obtained. The electrochemical measurements show that the Pd/C catalyst without stabilizer has a higher electro-oxidation activity for formic acid compared to that of a Pd/C catalyst prepared in a traditional high temperature polyol process in ethylene glycol.
Journal: Journal of Power Sources - Volume 195, Issue 21, 1 November 2010, Pages 7246–7249