Well-dispersed platinum nanoparticles supported on hierarchical nitrogen-doped porous hollow carbon spheres with enhanced activity and stability for methanol electrooxidation

作者：Zhang Jun; Ma Li^*; Gan Mengyu; Yang Fangfang; Fu Shenna; Li Xiao

来源：Journal of Power Sources, 2015, 288: 42-52.

DOI：10.1016/j.jpowsour.2015.04.109

• Pt nanoparticles
• Hierarchical nitrogen-doped porous hollow carbon
• Electrocatalyst
• Methanol oxidation
• Catalyst durability

Hierarchical nitrogen-doped porous hollow carbon spheres (HNPHCS) with porous-thin mesoporous shell and hollow macroporous core structure have been prepared via in-situ oxidation polymerization method using polyaniline as the precursor. After carbonization at 900 degrees C, the average diameter of HNPHCS is ca. 140 nm with shell thickness of similar to 1 nm. Pt nanoparticles with high dispersion and small size have been successfully deposited on the HNPHCS by a microwave-assisted polyol process to synthesize Pt/HNPHCS catalyst. The obtained samples are characterized by physical characterization and electrochemical measurements. Electrochemical studies reveal that the prepared Pt/HNPHCS catalyst possesses notably higher catalytic activity and CO-tolerance, and better stability toward methanol electrooxidation in comparison with Pt/nitrogen,-doped porous carbon and the commercial Pt/C catalysts. It is likely that enhanced catalytic properties of the Pt/HNPHCS could be due to the high dispersion of small Pt nanoparticles, the presence of nitrogen species, developed porous-thin mesoporous shell and hollow macroporous core structure of support HNPHCS. As a result, the as-developed Pt/HNPHCS present attractive advantages for the application in fuel cell electrocatalyst.

• 出版日期2015-8-15
• 单位重庆大学