Study of voltage cycling conditions on Pt oxidation and dissolution in polymer electrolyte fuel cells

JOURNAL OF POWER SOURCES

卷:493

Article

Kovtunenko, V. A.^1,2  Karpenko-Jereb, L.³ 

[1] Karl Franzens Univ Graz, Inst Math & Sci Comp, NAWI Graz, Heinrichstr 36, A-8010 Graz, Austria

[2] Russian Acad Sci, Lavrentyev Inst Hydrodynam, Siberian Div, Novosibirsk 630090, Russia

[3] Graz Univ Technol, Inst Elect Sensor Syst, Inffeldgasse 10-2, A-8010 Graz, Austria

关键词: Polymer-electrolyte fuel cell;    Platinum surface blockage;    Platinum dissolution;    Potential cycling;    Reaction?diffusion;    Butler?Volmer reaction;   

DOI  :  10.1016/j.jpowsour.2021.229693

来源: Elsevier

【 摘 要 】

This paper is devoted to study the electrochemical behavior of Pt catalyst in a polymer electrolyte fuel cell at various operating conditions and at different electric potential difference (also known as voltage) cycling applied in accelerated stress tests. The degradation of platinum is considered with respect to the Pt dissolution and the Pt oxide coverage of catalyst described by a one-dimensional model. In the model, degradation rate increases with temperature and decreasing particle diameter of Pt nano-particles. The theoretical study of the underlying diffusion system with the nonlinear reactions is presented by analytical methods and gives explicit solutions through a first integral of the ODE system. Numerical tests are obtained using a second order implicit?explicit scheme. The computer simulation shows that the lifetime of the catalyst depends on the voltage profile and the upper potential level. By this Pt mass loss is more significant at the membrane surface than at the gas diffusion layer.

【 授权许可】

Free