PEI-GNs/PMo_(12)复合膜负载Pd对甲酸氧化催化性能研究

Study on preparation of PEI-GNs/PMo_(12) composite film supported Pd catalysts and its electro-oxidation for formic acid

利用层层自组装法制备了PEI-GNs/PMo_(12)复合膜,以PEI-GNs/PMo_(12)复合膜为载体,利用电化学还原法制备了复合膜载Pd催化剂(Pd/PEI-GNs/PMo_(12))。运用X射线光电子能谱(XPS)、X射线粉末衍射(XRD)、扫描电镜(SEM)等对催化剂的组成、结构、形态进行表征,结果表明:实验成功制备了Pd/PEI-GNs/PMo_(12)催化剂,且Pd/PEI-GNs/PMo_(12)改善了Pd粒子的分散性。运用电化学方法考察了Pd/PEI-GNs/PMo_(12)对Pd纳米粒子电催化性能的影响,结果表明,相对于Pd催化剂,Pd/PEI-GNs/PMo_(12)催化剂表现出更高的催化活性和稳定性,这主要是由于Pd粒子在PEI-GNs/PMo_(12)载体上形成均匀分散的纳米粒子及PEI-GNs/PMo_(12)良好的电子传递能力。

The LBL method was used to synthesize PEI-GNs/PMo12 composite film. The Pd/PEI-GNs/PMo12 catalystwas prepared by the electrochemical deposition technique with PEI-GNs/PMo12 composite film as the carrier. Theas-prepared catalyst was characterized by XRD, XPS and SEM. It was shown that Pd particles were well dispersedon the PEI-GNs/PMo12 substrate. The performance of the Pd/PEI-GNs/PMo12 catalyst toward formic acid oxidationwas examined by electrochemical technique. Comparing with the Pd catalyst, the as-prepared Pd/PEI-GNs/PMo12catalyst presented better electrocatalytic activity and stability towards formic acid oxidation reaction. Theenhancement in electrochemical activity of the Pd/PEI-GNs/PMo12 catalyst could be attributed to the well dispersedPd nanoparticles on the carrier and higher electron transfer of PEI-GNs/PMo12.