Incorporation of voltage degradation into a generalised steady state electrochemical model for a PEM fuel cell

摘要: Currently there has been very little reliability or end-of-life analysis conducted for polymer electrolyte membrane fuel cell (PEM) stacks, and detailed designs of PEM systems are still in a rapid evolutionary stage. Voltage degradation as ages is widely observed phenomenon results significant reduction the electrical power produced by stack. Little systematic information reported, however, this not included electrochemical models. An earlier work described development generalised steady state model (GSSEM) which accepts input values operating variables (anode cathode feed gas pressure compositions, temperature current density), design parameters such active area Nafion thickness. This will introduce new terms to account electrode assembly (MEA) ageing, factor durability One term based on concept that water-carrying capacity (a principal resistance) deteriorates with time-in-service. A second involves apparent catalytic rate constants associated reactions anode side, changes activity site density due catalyst degradation. third deals decrease mass transfer within MEA. The resulting largely mechanistic, most being derived from theory including coefficients have theoretical basis, but includes empirical deal changing performance. Changes polarisation curve predicted (GSSEDM) demonstrated data performance typical hardware.