功能化石墨烯载钯纳米花的制备及电催化甲酸氧化

Preparation of functionalized graphene and supported flower-like Pd composite for electrocatalytic formic acid oxidation

通过溶液法合成了β-环糊精功能化的石墨烯(β-CD-rGO),以其为载体,利用电化学还原法制备了β-环糊精功能化石墨烯载Pd纳米花复合材料(Pd/β-CD-rGO)。运用X射线粉末衍射、扫描电镜、X射线光电子能谱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β-环糊精功能化石墨烯载Pd催化剂,且β-环糊精功能化的石墨稀改变了Pd纳米粒子的形貌。运用电化学方法考察了β-环糊精功能化石墨烯对Pd纳米粒子电催化性能的影响。结果表明,相对于Pd催化剂,β-环糊精功能化石墨烯载Pd催化剂表现出更高的催化活性和稳定性,前者归因于Pd的花状形貌,后者是由于β-环糊精功能化石墨烯与Pd纳米花之间的相互作用,减缓了Pd的迁移。

β-cyclodextrin functionalized graphene(β-CD-rGO)was synthesized by solution method.Withβ-CD-rGO as the carrier,the functionalized graphene and supported flower-like Pd catalyst(Pd/β-CD-rGO)was prepared by electrochemical deposition technique.The as-prepared catalyst was characterized by XRD,XPS and SEM.It is shown that the catalyst is successfully prepared and the morphology of Pd nanoparticles is affected byβ-CD-GNs.The performance of the Pd/β-CD-rGO catalyst toward formic acid oxidation was examined by electrochemical technique.Comparing with the Pd catalyst,the as-prepared Pd/β-CD-GNs catalyst presents better electrocatalytic activity and stability towards formic acid oxidation reaction.The enhancement in electrochemical activity of the Pd/β-CD-rGO catalyst can be attributed to the synergistic effect of flower-like Pd nanoparticles on theβ-CD-rGO.The enhanced stability could be ascribed to a strengthened metal-support interaction.