Effect of pore morphology of mesoporous carbons on the electrocatalytic activity of Pt nanoparticles for fuel cell reactions

• Published in: Applied catalysis. B, Environmental Vol. 98; no. 3-4; pp. 132 - 137
• Main Authors: Song, Shuqin, Liang, Yeru, Li, Zhenghui, Wang, Yi, Fu, Ruowen, Wu, Dingcai, Tsiakaras, Panagiotis
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 01-08-2010; Elsevier
• Subjects: Carbon; Catalysis; Chemistry; Colloidal state and disperse state; Electrochemistry; Ethanol electrooxidation; Ethyl alcohol; Exact sciences and technology; Fuel cells; General and physical chemistry; Kinetics and mechanism of reactions; Mesoporous carbon; Morphology; Nanoparticles; Nanostructure; Oxygen reduction reaction; PEM fuel cells; Physical and chemical studies. Granulometry. Electrokinetic phenomena; Platinum; Pore morphology; Porosity; Porous materials; Pt nanoparticles; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Pt nanoparticles; Ethanol electrooxidation; Pore morphology; PEM fuel cells; Mesoporous carbon; Oxygen reduction reaction; Support; Nanoparticle; Active site; Alcohol; Porous material; Chemical reduction; Electrocatalysis; Pore size; Alkanol; Structure; Fuel cell; Oxygen; Ethanol; Carbon; Mesoporosity; Heterogeneous catalysis; Liquid; Pore; Morphology; Electrochemistry; Surface area; Environmental protection
• ISSN: 0926-3373; 1873-3883
• DOI: 10.1016/j.apcatb.2010.05.021

In the present investigation, the role of the pore morphology of mesoporous carbons in the electrocatalytic activity of Pt nanoparticles for fuel cell reactions has been successfully revealed by adopting ordered mesoporous carbon CMK-3 and disordered wormhole-like mesoporous carbon (WMC) as the support material, respectively. Both materials possess very similar pore characteristics (pore volume, BET surface area, mesopore size) except pore morphology. It has been found that CMK-3 can provide Pt nanoparticles with more electrochemically active Pt sites and higher electrochemical surface area, and thus, Pt/CMK-3 exhibits superior fuel cell reactions activity compared to Pt/WMC, especially in the case of liquid reactants (e.g. ethanol). This could be attributed to the much easier mass transportation through CMK-3 support profiting from both the high ordered degree and the very good 3D interconnection of the nano-spacings of their hexagonally arrayed carbon nanorods (i.e. mesopores), thus leading to more accessibility of Pt nanoparticles. The above results demonstrates that the pore morphology of carbon supports plays a decisive role in the electrocatalytic activity of their supported Pt nanoparticles, although other structure parameters like pore size are very similar.