Immobilization of Platinum Nanoparticles on 3,4-diaminobenzoyl- Functionalized Multi-Walled Carbon Nanotube and its Electrocatalytic Activity.

摘要

Multi-walled carbon nanotubes (MWCNTs) are functionalized at the sp2 C-H defect sites with 3,4-diaminobenzoic acid by a 'direct' Friedel-Crafts acylation reaction in a mild polyphosphoric acid/ phosphorous pentoxide medium. Owing to enhanced surface polarity, the resulting 3,4- diaminobenzoylfunctionalized MWCNTs (DAB-MWCNT) are highly dispersible in polar solvents, such as ethanol N-methyl-2-pyrrolidone, and methanesulfonic acid. The absorption and emission properties of DABMWCNT in solution state are qualitatively shown to be sensitive to the pH in the environment. The DABMWCNT is used as a stable platform on which to deposit platinum nanoparticles (PNP). The PNP/DABMWCNT hybrid displays high electrocatalytic activity with good electrochemical stability for an oxygen reduction reaction under an alkaline condition.