Premium
Determination of the Potentiostatic Stability of PEMFC Electro Catalysts at Elevated Temperatures
Author(s) -
Dam V. A. T.,
Jayasayee K.,
de Bruijn F. A.
Publication year - 2009
Publication title -
fuel cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.485
H-Index - 69
eISSN - 1615-6854
pISSN - 1615-6846
DOI - 10.1002/fuce.200800136
Subject(s) - platinum , quartz crystal microbalance , cyclic voltammetry , electrochemistry , catalysis , inorganic chemistry , glassy carbon , oxide , chemistry , dissolution , corrosion , carbon fibers , materials science , analytical chemistry (journal) , electrode , metallurgy , adsorption , composite material , chromatography , organic chemistry , composite number
Abstract The electrochemical stability of platinum on carbon catalyst (Hispec™ 4000, Johnson Matthey) has been investigated predominantly at constant potentials ranging from 0.95 to 1.25 V at elevated temperatures. By combining a quartz crystal microbalance (QCM) with electrochemical techniques, dynamic insight is obtained on the oxidation and corrosion of both platinum and carbon during potentiostatic hold. From the cyclic voltammetry (CV) data, it can be concluded that at all conditions, the platinum surface area decreases when Pt on carbon catalysts are exposed to a constant potential of 1.05 to 1.25 V. Under the applied conditions, this loss of surface area is primarily caused by the dissolution of platinum. Both the QCM as well as on‐line electrochemical mass spectrometry (OLEMS) experiments show that the corrosion of carbon is catalysed by the presence of platinum at 80 °C, as long as the platinum surface is not passivated by an oxide layer.