Acknowledgment
The authors would like to thank the referees for their useful comments. In addition, we would like to recognize our colleague, John Weidner, for his proofreading and suggestions.
This project is a result of the interdisciplinary interactions supported by the Center for Electrochemical Engineering (URL: http://www.che.sc.edu/centers/CEE/, which has been funded by the State of South Carolina. In addition, the first author was partially supported by the National Science Foundation under grant DMS-9404488.
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