In this section
@article{Kucernak:2016:10.1016/j.electacta.2016.11.054,
author = {Kucernak, ARJ and kakati and Fahy, KF},
doi = {10.1016/j.electacta.2016.11.054},
journal = {Electrochimica Acta},
pages = {888--897},
title = {Using corrosion-like processes to remove poisons from electrocatalysts: a viable strategy to chemically regenerate irreversibly poisoned polymer electrolyte fuel cells},
url = {http://dx.doi.org/10.1016/j.electacta.2016.11.054},
volume = {222},
year = {2016}
}
TY - JOUR
AB - Poisoning of Pt/C catalysts due to SO2 on a rotating disk electrode (RDE), and as part of the cathode layer in a single cell fuel cell and fuel cell stack are studied in terms of the system performance, and the effect of electrochemical and chemical post treatment to remove the adsorbed sulphur containing species. It is found that external polarisation can only recover the ORR performance of catalyst on an RDE after SO2 poisoning when an applied potential of 1.6 V(RHE) is used for 1 ks. An alternative approach is to use ozone, as in the presence of this species, the electrode potential is raised to ~1.6V(RHE) due to the high potential of the ozone reduction reaction. The high open circuit potential leads to a mixed potential and was found also to be highly efficient at removing the poison via coupled ozone reduction and poison oxidation. The ozone process is found to work efficiently at the catalyst level as shown through rotating disk electrode studies and also in single cell fuel cells. Furthermore we demonstrate for the first time the recovery of a SO2 poisoned fuel cell stack using the mixed-potential approach and ozone as a reactant. The cleaning process is fast (~10 minutes), occurs at room temperature, and does not require any special modification to the fuel cell. The process may be applicable to a wide range of poisons which can be oxidatively removed from platinum at high potentials.
AU - Kucernak,ARJ
AU - kakati
AU - Fahy,KF
DO - 10.1016/j.electacta.2016.11.054
EP - 897
PY - 2016///
SN - 1873-3859
SP - 888
TI - Using corrosion-like processes to remove poisons from electrocatalysts: a viable strategy to chemically regenerate irreversibly poisoned polymer electrolyte fuel cells
T2 - Electrochimica Acta
UR - http://dx.doi.org/10.1016/j.electacta.2016.11.054
UR - http://hdl.handle.net/10044/1/42505
VL - 222
ER -
Prof. Anthony Kucernak
G22B
Molecular Sciences Research Hub (MSRH)
Imperial College London
White City Campus
London
W12 0BZ
United Kingdom
Phone: +44 (0)20 7594 5831
Fax: +44 (0)20 7594 5804
Email: anthony@imperial.ac.uk