A surfactant-free strategy for synthesizing reduced graphene oxide supported palladium nanoparticles with enhanced electrocatalytic performance towards formic acid oxidation

作者：Gao, Xueqing; Li, Fumin; Li, Yumei; Li, Shuni; Chen, Yu; Lee, Jong-Min^*

来源：Journal of Power Sources, 2015, 280: 491-498.

DOI：10.1016/j.jpowsour.2015.01.131

• Graphene
• Sulfonate groups
• Palladium nanoparticles
• Electrocatalysis
• Formic acid oxidation

A simple noncovalent method is used to graft sulfonate (-SO3H) groups on a graphene oxide (GO) surface by the pi-pi stacking interaction between 1-propylsulfonic-3-methylimidazolium chloride and GO. The immobilization of sulfonate groups on the GO surface is confirmed by various physical techniques, such as X-ray photoelectron spectroscopy, ultraviolet and visible spectroscopy, and zeta potential analysis, etc. The as-prepared sulfonate functionalized GO composites (GO-SO3H) are further used as supporting material to anchor PdO center dot H2O nanoparticles through the slow hydrolysis of PdCl2. The sulfonate functionalized reduced GO composites (rGO-SO3H) supported Pd nanoparticles composites (Pd/rGO-SO3H) are obtained through the simultaneous reduction of PdO center dot H2O and the GO-SO3H with sodium borohydride. As shown by transmission electron microscopy, Pd nanoparticles with good dispersity effectively anchor on the rGO-SO3H surface. The as-prepared Pd/rGO-SO3H composites display the improved electrocatalytic activity and long-term stability towards the formic acid oxidation reaction compared to the un-sulfonated counterpart.

• 出版日期2015-4-15
• 单位南阳理工学院; 陕西师范大学