PEM Fuel Cell Pt ∕ C Dissolution and Deposition in Nafion Electrolyte

Dissolution at the cathode and subsequent transport of platinum to the other cell components causes catalyst degradation in proton exchange membrane (PEM) fuel cells. Deposition of platinum in Nafion membrane was observed after potential cycling under hydrogen/air conditions. The deposited Pt formed a band in the ionomer, and a straightforward model was proposed to describe its location. The predicted position of the Pt band agreed with the experimental data. A simple scanning electron microscopy-energy dispersive spectroscopy analysis was used to estimate that ∼ 13% of the platinum initially in the cathode was transported into the membrane following 3000 potential cycles.

[1]  Hubert A. Gasteiger,et al.  Instability of Pt ∕ C Electrocatalysts in Proton Exchange Membrane Fuel Cells A Mechanistic Investigation , 2005 .

[2]  James M. Fenton,et al.  Investigation of platinum oxidation in PEM fuel cells at various relative humidities , 2007 .

[3]  Eiji Endoh,et al.  Degradation study of MEA for PEMFCs under low humidity conditions , 2004 .

[4]  S. J. Schmieg,et al.  The spectroscopic observation of water formation , 1982 .

[5]  Robert M. Darling,et al.  Mathematical Model of Platinum Movement in PEM Fuel Cells , 2005 .

[6]  M. Pourbaix.  Atlas of Electrochemical Equilibria in Aqueous Solutions , 1974 .

[7]  Ping Yu,et al.  PtCo/C cathode catalyst for improved durability in PEMFCs , 2005 .

[8]  Kazuhiko Shinohara,et al.  Phenomenon Analysis of PEFC for Automotive Use(1) Membrane Degradation Behavior During OCV Hold Test , 2006 .

[9]  Ronald Woods,et al.  A study of the dissolution of platinum, palladium, rhodium and gold electrodes in 1 m sulphuric acid by cyclic voltammetry , 1972 .

[10]  D. T. Napp,et al.  A ring-disk electrode study of the current/potential behaviour of platinum in 1.0 M sulphuric and 0.1 M perchloric acids , 1970 .

[11]  Hiroyuki Uchida,et al.  Self‐Humidifying Polymer Electrolyte Membranes for Fuel Cells , 1996 .

[12]  G. Fisher,et al.  The interaction of water with the Pt(111) surface , 1980 .

[13]  Tomoki Akita,et al.  Platinum dissolution and deposition in the polymer electrolyte membrane of a PEM fuel cell as studied by potential cycling. , 2006, Physical chemistry chemical physics : PCCP.

[14]  Robert M. Darling,et al.  Kinetic Model of Platinum Dissolution in PEMFCs , 2003 .