核磁気共鳴を利用した小型表面コイルによるPEFC内の電流分布計測法の開発 : 第2報,PEFC積層方向に電流が流れる場合での一次元電流分布の計測(熱工学,内燃機関,動力など)

概要

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To improve a performance of PEFC, it is necessary to maintain high current density generating in the whole area of a fuel cell. Spatial distribution of the electric current generating in PEFC can be measured from the frequency shift of Nuclear Magnetic Resonance (NMR) signal received by planar surface coils inserted into PEFC. Applying this technique, the frequency shift of NMR signal in the PEFC which sent power generation current in the lamination direction was measured. In this study, two kinds of Polymer Electrolyte Membrane (MEA) were used. One was MEA which applied the platinum catalyst to an area of 50mm×50mm. The other was MEA with platinum catalyst of its half area. The distributions of the frequency shift of NMR signal in PEFCs used two MEAs were measured, and the spatial distributions of current density generating in PEFCs were obtained. The result of MEA with Pt catalyst of 50mm×50mm area showed uniform current distribution in the whole area. On the other hand, the results of MEA with Pt catalyst of the half area showed two areas, the region of uniform current, and the region of zero current. These measurement results were in agreement with the theoretical-analysis results of magnetic field in PEFC. The uncertainly of this measurement technique was evaluated from the obtained results.
2010-12-25