多孔AuPd催化剂的制备及在甲酸制氢中的应用

Preparation of porous AuPd catalysts and their applications in hydrogen production from formic acid decomposition

利用氢泡动力学模板制备的AuPd泡沫在室温下对甲酸催化分解制氢具有很高的催化活性。三维多孔AuPd泡沫薄膜是由纳米枝晶构成的。高催化活性是由于纳米枝晶中存在大量的活性位点,如台阶、拐角、扭结和边缘,以及电子效应的影响。AuPd纳米泡沫膜催化剂除了具有较高的活性外,还具有很多优点。例如,在不需要有机添加剂和后处理的情况下,利用氢气泡模板在Ti衬底上可以快速地电沉积泡沫结构。将电沉积泡沫膜浸入HCOOH+HCOONa溶液中,氢气就产生,将电沉积膜拉出溶液,氢气就停止产生,氢气的生成容易受控制。催化剂易活化,活化过程只需将催化剂用水洗后、干燥或者在硫酸溶液中扫循环伏安即可。

AuPd foams prepared by hydrogen bubble dynamics template possess high catalytic activity for the production of high-quality H 2 from formic acid decomposition at room temperature.We found that 3D porous thin films of AuPd foams comprised of nanodendrites.The high catalytic activity is attributed to the presence of abundant active sites like steps,corners,kinks and edges in the nanodendrites,and to the electronic effect.Besides the high activity,there are some more advantages for the catalysts of nanodendrtic alloy foam films.For example,the foam films can be quickly electrodeposited on a Ti substrate utilizing the template of hydrogen bubbles without needing organic additives and post-treatment.The hydrogen production is easily controllable,and we can get hydrogen and stop hydrogen production just by immersing the electrodeposited foam film into and pulling it out of the solution of HCOOH+HCOONa.The foam films can also be easily reactivated either by drying after water cleaning or by potential cycling in H 2SO 4 solution.