Pt/C catalyst degradation in proton exchange membrane fuel cells due to high-frequency potential cyc

Abstract Proton exchange membrane fuel cells are operated using switching power converters that produce high-frequency ripple currents. These ripples cause high-frequency potential cycling of cells, which is believed to lead premature deterioration in the electrochemical surface area (ECA) of Pt/C catalysts. The qualitative relationship between ECA losses and the frequency of potential cycling was investigated in the range of 1 Hz to 1 kHz. For frequencies higher than 100 Hz, ECA losses were comparable with those at the potential hold condition. However, for lower frequencies, ECA decreased significantly with decreasing frequency. TEM observations showed that there was marked Pt particle growth for the 1-Hz cycling condition, whereas particle size distributions at 100 Hz and potential hold conditions were comparable. The currents associated with Pt oxidation and reduction during potential cycling were also investigated at various potentials and frequencies, and the charges associated with Pt loss (ΔQ) were determined by integrating the measured current. A correlation between the ECA trend and ΔQ was observed. The results obtained in this study are considered informative for electrical engineering research, because it relates to the design of switching power converters that do not negatively influence the Pt/C catalyst durability.

[1]  Mathias Schulze,et al.  A review of platinum-based catalyst layer degradation in proton exchange membrane fuel cells , 2009 .

[2]  Jiujun Zhang,et al.  A review of accelerated stress tests of MEA durability in PEM fuel cells , 2009 .

[3]  Yong Wang,et al.  Efficient and ripple-mitigating dc–dc converter for residential fuel cell system , 2009 .

[4]  S.K. Mazumder,et al.  A Ripple-Mitigating and Energy-Efficient Fuel Cell Power-Conditioning System , 2007, IEEE Transactions on Power Electronics.

[5]  M. S. Arefeen,et al.  Analysis and minimization of input ripple current in PWM inverters for designing reliable fuel cell power systems , 2006 .

[6]  Woojin Choi,et al.  An experimental evaluation of the effects of ripple current generated by the power conditioning stage on a proton exchange membrane fuel cell stack , 2004 .

[7]  Jean St-Pierre,et al.  Low Cost Electrodes for Proton Exchange Membrane Fuel Cells Performance in Single Cells and Ballard Stacks , 1997 .

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

[9]  S.K. Mazumder,et al.  Solid-oxide-fuel-cell performance and durability: resolution of the effects of power-conditioning systems and application loads , 2004, IEEE Transactions on Power Electronics.

[10]  Thomas F. Fuller,et al.  The effect of humidity and oxygen partial pressure on degradation of Pt/C catalyst in PEM fuel cell , 2009 .

[11]  Geping Yin,et al.  Understanding and Approaches for the Durability Issues of Pt-Based Catalysts for PEM Fuel Cell , 2007 .

[12]  P.N. Enjeti,et al.  Development of an equivalent circuit model of a fuel cell to evaluate the effects of inverter ripple current , 2004, Nineteenth Annual IEEE Applied Power Electronics Conference and Exposition, 2004. APEC '04..

[13]  Yong Wang,et al.  Fuel cell power conditioning system design for residential application , 2009 .

[14]  Shyam S. Kocha,et al.  Electrocatalyst Durability under Simulated Automotive Drive Cycles , 2008 .

[15]  G. W. Graham,et al.  Influence of Cyclic Operation on PEM Fuel Cell Catalyst Stability , 2007 .

[16]  David L. Wood,et al.  PEM fuel cell electrocatalyst durability measurements , 2006 .

[17]  M. Matsumoto,et al.  In situ and real-time monitoring of oxide growth in a few monolayers at surfaces of platinum nanoparticles in aqueous media. , 2009, Journal of the American Chemical Society.

[18]  Jun Shen,et al.  A review of PEM fuel cell durability: Degradation mechanisms and mitigation strategies , 2008 .

[19]  A. Vahidi,et al.  A review of the main parameters influencing long-term performance and durability of PEM fuel cells , 2008 .

[21]  T. Meynard,et al.  Interactions Between Fuel Cells and Power Converters: Influence of Current Harmonics on a Fuel Cell Stack , 2007, IEEE Transactions on Power Electronics.

[22]  K. Ota,et al.  Consumption Rate of Pt under Potential Cycling , 2007 .