Enhancement of electrochemical stability and catalytic activity of Pt nanoparticles via strong metal-support interaction with sulfur-containing ordered mesoporous carbon

• Published in: Catalysis today 2011-04, Vol.164 (1), p.186-189
• Main Authors: Kwon, Kyungjung, Jin, Seon-ah, Pak, Chanho, Chang, Hyuk, Joo, Sang Hoon, Lee, Hyung Ik, Kim, Jin Hoe, Kim, Ji Man
• Format: Article
• Language: English
• Subjects: carbon; Catalysis; catalytic activity; Chemistry; Colloidal state and disperse state; Electrochemistry; Exact sciences and technology; General and physical chemistry; nanoparticles; Ordered mesoporous carbon; oxygen; Oxygen reduction; Physical and chemical studies. Granulometry. Electrokinetic phenomena; Porous materials; Pt nanoparticle; reaction kinetics; Stability; Strong metal-support interaction; Sulfur; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
• ISSN: 0920-5861; 1873-4308
• DOI: 10.1016/j.cattod.2010.10.030

Pt nanoparticles on sulfur-containing ordered mesoporous carbon (Pt/S-OMC) are obtained with 3 nm in size and 60 wt.% loading. XPS analysis shows that there is a strong metal-support interaction between Pt nanoparticles and S atoms embedded on the OMC support. This strong metal-support interaction fastens Pt nanoparticles upon the support and alters the electronic state of Pt from Pt 0 of bulk Pt to a slightly charged state of Pt δ+ . These features result in an improvement both in electrochemical stability and oxygen reduction reaction kinetics compared to Pt/OMC where the OMC does not have sulfur atoms. The approach of tuning the electronic state and the interaction of Pt on carbon supports by embedding heterogeneous atoms into the OMC can effectively improve the stability and catalytic activity of Pt nanoparticles.