Sulfonated polyaniline nanofiber as Pt-catalyst conducting support for proton exchange membrane fuel cell

Autor: Yu-Kai Han, Ko-Shan Ho, Chung-Wen Kuo, Rong-Hua Wu, Ting-En Wei, Po-Hao Tseng, Ming-Jer Tsai, Tar-Hwa Hsieh, Yen-Zen Wang
Rok vydání: 2014
Předmět:
Zdroj: Polymer. 55:2035-2043
ISSN: 0032-3861
DOI: 10.1016/j.polymer.2014.02.066
Popis: Carbonization at high temperature can significantly increase the conductivity of polyaniline nanofibers (PANF) but the created carbonized surface is too hydrophobic for Pt-loading. Sulfonic acid groups are then grafted on the carbonized PANF by ultra-sonication in concentrated sulfuric acid to increase the surface hydrophilicity and Pt-loading. The obtained sulfonated carbonized PANF was found to own not just high conductivity but good hydrophilicity which can load more than 18% of Pt on the surface from a 25% H 2 PtCl 6 (aq) and demonstrate better electrochemical activity in the cyclic voltaic and ORR testing. The surface area of the loaded Pt per unit support can be increased from 85.66 to 276.61 cm 2 mg −1 after 24 h of sulfonation. The single cell performance demonstrates an increasing power and maximum current density with degree of sulfonation for MEA made of the sulfonated carbonized PANF.
Databáze: OpenAIRE