Ag/PEI-GNs复合材料的制备及对水合肼的电催化氧化

Preparation of Ag/PEI-GNs composite and its electro-oxidation for hydrazine

以聚乙烯亚胺(PEI)功能化的石墨烯(PEI-GNs)为载体,利用电化学还原法制备了Ag/PEI-GNs复合材料。运用X射线光电子能谱、X射线粉末衍射、扫描电镜等对复合材料的组成、结构、形态进行表征,结果表明,实验成功制备了Ag/PEI-GNs复合材料,且PEI-GNs改善了Ag粒子的分散性。运用电化学方法考察了PEI-GNs对Ag纳米粒子电催化性能的影响,结果表明,相对于Ag催化剂,Ag/PEI-GNs催化剂表现出更高的催化活性和稳定性,前者归因于Ag颗粒分散度高,后者是由于PEI-GNs与Ag颗粒之间的相互作用,减缓了Ag的迁移。

Ag/PEI-GNs composites were prepared by the electrochemical deposition technique with PEI-GNs as the carrier.The as-prepared composites were characterized by XRD,XPS and SEM.It shown that Ag/PEI-GNs was successfully prepared and Ag particles were uniformly dispersed on PEI-GNs substrate.The performance of Ag/PEI-GNs catalyst toward hydrazine oxidation was examined by electrochemical technique.Comparing with Ag catalyst,the as-prepared Ag/PEIGNs presented better electrocatalytic activity and stability towards hydrazine oxidation reaction.The enhancement in electrochemical activity of Ag/PEI-GNs can be attributed to the synergistic effect of highly dispersed Ag nanoparticles on the PEI-GNs.The enhanced stability could be ascribed to a strengthened metal-support interaction.