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• W170706516 abstract "The purpose of this chapter is to discuss diagnostic tests for assessing the causes of performance decay in polymer-electrolyte fuel cells. Determining the causes of degradation can be challenging and often requires application of a myriad of investigative techniques. For example, a destructive analysis of the cell that includes sophisticated analytical tools like scanning-electron microscopy is usually required to identify the physical changes responsible for loss of performance. Effective diagnostic tests can provide insight into which components, portions of the active area, and cells within a stack deserve detailed examination. Therefore, effective execution and analysis of in-cell diagnostics are critical to determining the causes of performance changes in an efficient manner. The first step is to determine what types of overpotential are responsible for the changes in performance, namely: kinetic, ohmic, or mass transport. Because leaks within a cell can also contribute to changes in performance, or failure, this type of degradation is included as well. A polarization-change curve is presented here as a simple tool to assist in apportioning the decay to the different types of overpotential. Additional diagnostics can be selected to establish the sources of these changes, once the major types of overpotential have been identified. In-cell diagnostics for each of the major types of polarization are recommended and briefly described. The intent of this chapter is not to provide complete descriptions of test procedures, since most have been adequately described in references provided throughout the chapter, but instead to outline an effective and efficient protocol to help determine the root cause of performance degradation. An overview of accelerated testing, which is often part of any concerted effort to study and improve durability, is also included. In order to develop accelerated test protocols one must understand the parameters that affect decay rates. Advantages and disadvantages of different types of accelerated testing are discussed." @default.
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• W170706516 date "2012-01-01" @default.
• W170706516 modified "2023-09-27" @default.
• W170706516 title "Experimental Diagnostics and Durability Testing Protocols" @default.
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• W170706516 doi "https://doi.org/10.1016/b978-0-12-386936-4.10007-7" @default.
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