Title :

CO Impact on the Stability Properties of PtxCoy Nanoparticles in PEM Fuel Cell Anodes: Mechanistic Insights

Author(s) :

Cheah, Seng Kian [Auteur]
Sicardy, Olivier [Auteur]
Marinova, Maya [Auteur]
Guetaz, Laure [Auteur]
Lemaire, Olivier [Auteur]
Gélin, Patrick [Auteur]
Franco, Alejandro A. [Auteur]

Journal title :

Journal of the Electrochemical Society

Volume number :

158

Pages :

B1358

Publication date :

2011

HAL domain(s) :

Chimie/Catalyse

English abstract : [en]

Based on a multiscale modeling framework, we focus on understanding the impact of CO adsorption on the intrinsic stability properties of PtxCoy nanoparticles under PEMFC anode operating conditions. Firstly, CO adsorption ...
Show more >Based on a multiscale modeling framework, we focus on understanding the impact of CO adsorption on the intrinsic stability properties of PtxCoy nanoparticles under PEMFC anode operating conditions. Firstly, CO adsorption effect on PtxCoy has been studied by using Monte Carlo (MC) simulation. Then, the MC results were coupled with a non-equilibrium thermodynamics kinetics model (MEMEPhys®) to simulate the effect of CO poisoning on the activity and durability of PtxCoy nanoparticles as HOR catalysts. The results are compared with simulations carried out on Pt, where potential self-oscillatory behaviour is observed and experimentally confirmed. The PtxCoy HOR activity and stability properties reveal to be strongly dependent on the nanoparticle size and composition. For certain nanoparticle sizes, simulations show that PtCo nanoparticles provide better CO tolerance than Pt3Co. However, the CO tolerance of PtCo degrades faster than that of Pt3Co in long-term operation. From both modeling and experimental approaches, it is demonstrated for the first time that this observation is due to the fact that CO adsorption enhances Cobalt dissolution.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Collections :

• Autres travaux scientifiques

Submission date :

2019-06-17T08:43:26Z
2020-03-09T17:14:41Z