Polyaniline-Functionalized Carbon Nanotube Supported Platinum Catalysts

• Published in: Langmuir 2011-05, Vol.27 (9), p.5582-5588
• Main Authors: He, Daping, Zeng, Chao, Xu, Cheng, Cheng, Niancai, Li, Huaiguang, Mu, Shichun, Pan, Mu
• Format: Article
• Language: English
• Subjects: Applied sciences; Catalysis; Chemistry; Colloidal state and disperse state; Electrochemistry; Energy; Energy. Thermal use of fuels; Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc; Exact sciences and technology; Fuel cells; General and physical chemistry; Materials: Nano-and Mesostructured Materials, Polymers, Gels, Liquid Crystals, Composites; Physical and chemical studies. Granulometry. Electrokinetic phenomena; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
• ISSN: 0743-7463; 1520-5827
• DOI: 10.1021/la2003589

Electrocatalytically active platinum (Pt) nanoparticles on a carbon nanotube (CNT) with enhanced nucleation and stability have been demonstrated through introduction of electron-conducting polyaniline (PANI) to bridge the Pt nanoparticles and CNT walls with the presence of platinum−nitride (Pt−N) bonding and π−π bonding. The Pt colloids were prepared through ethanol reduction under the protection of aniline, the CNT was dispersed well with the existence of aniline in the solution, and aniline was polymerized in the presence of a protonic acid (HCl) and an oxidant (NH4S2O8). The synthesized PANI is found to wrap around the CNT as a result of π−π bonding, and highly dispersed Pt nanoparticles are loaded onto the CNT with narrowly distributed particle sizes ranging from 2.0 to 4.0 nm due to the polymer stabilization and existence of Pt−N bonding. The Pt−PANI/CNT catalysts are electroactive and exhibit excellent electrochemical stability and therefore promise potential applications in proton exchange membrane fuel cells.