Study of Distributions of Temperatures and Potentials in the Horizontal Plane of a PAFC Singe Cell under Corrosive Conditions

Autor:	Kenro Mitsuda
Rok vydání:	2009
Předmět:	Leak Hydrogen Chemistry Analytical chemistry chemistry.chemical_element Reference electrode Cathode law.invention Corrosion Fuel gas law Thermocouple Electrochemistry Leakage (electronics)
Zdroj:	Electrochemistry. 77:56-62
ISSN:	2186-2451 1344-3542
DOI:	10.5796/electrochemistry.77.56
Popis:	Corrosive conditions, for example, high fuel utilization, crossover, and local gas leakage were studied using a single cell equipped both with twelve reference electrodes (RHEs) and with sixteen thermocouples, and changes of the distributions of temperatures and potentials in the plane of a PAFC single cell were investigated. High potential of the cathode was observed at the fuel gas starved area. High temperature zone was observed at the leak gas introduced area or at high current density area. When the hydrogen utilization was close to 100%, the maximum cathode potentials exceeded 0.9 V vs. RHE, and high possibility of corrosion was suggested at the fuel outlet area. In the case of local air leak from a tube laid in a fuel gas flow channel, the maximum cathode potential exceeded 1.2 V vs. RHE at the fuel downstream of the air leak point, and high possibility of corrosion was suggested at that area.
Databáze:	OpenAIRE
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