An ambient aqueous synthesis for highly dispersed and active Pd/C catalyst for formic acid electro-oxidation
An ambient aqueous synthesis for highly dispersed and active Pd/C catalyst for formic acid electro-oxidation
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DOI：
10.1016/j.jpowsour.2010.05.039
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发表时间：
2010-11
影响因子：
9.2
通讯作者：
N. Cheng;Haifeng Lv;Wen Wang;Shichun Mu;M. Pan;F. Marken
中科院分区：
文献类型：
--
作者：
N. Cheng;Haifeng Lv;Wen Wang;Shichun Mu;M. Pan;F. Marken
报道了一种实验简单的方法，在水溶液中和在环境条件下制备高度分散和活性的Pd/C催化剂，而不使用稳定剂。[Pd（NH3）4]2+离子在氨水溶液中通过温和加热合成，而没有形成Pd（OH）x络合物中间体。碳（Vulcan XC-72）表面吸附的[Pd（NH3）4]2+被NaBH 4原位还原为Pd纳米颗粒。用X射线衍射（XRD）和透射电子显微镜（TEM）对Pd/C催化剂进行了表征。结果表明，当Pd/C含量为20%时，在此条件下，可制得Pd含量高、平均粒径为4.3-4.7nm的Pd纳米粒子。电化学测试表明，与传统高温多元醇法制备的Pd/C催化剂相比，不加稳定剂的Pd/C催化剂对甲酸的电氧化活性更高。
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)xcomplex 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 20wt.% Pd content and with an average Pd nanoparticle diameter of 4.3–4.7nm 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.