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论文类型：期刊论文

发表时间：2014-01-15

发表刊物：JOURNAL OF POWER SOURCES

收录刊物：SCIE、EI、Scopus

卷号：246

页面范围：90-94

ISSN号：0378-7753

关键字：Proton exchange membrane fuel cell; Hydrogen depleted region; Dead-ended anode; Current distribution; Local potential

摘要：Proton exchange membrane fuel cells (PEMFCs) with a dead-ended anode (DEA) can obtain high hydrogen utilization by a comparatively simple system. Nevertheless, the accumulation of the nitrogen and the water in the anode channels can lead to a local fuel starvation, which degrades the performance and durability of PEMFCs. In this paper, the behaviors of PEMFCs with a DEA are explored experimentally by detecting the current distribution and the local potentials. The results indicate that the current distribution is uneven during the DEA operation. The local current firstly decreases at the region near the anode outlet, and then extends to the inlet region along the channels with time. The complete fuel starvation near the anode outlet leads to a high local potential and carbon corrosion on the cathode side. The SEM images of the cathode electrode reveal that the significant thickness reduction and the collapse of the electrode's porous structure happen in the cathode catalyst layer, leading to the irreversible decline of the performance. The comparison of the experiments with different oxidants and fuels reveals that the nitrogen crossover from cathode to anode is the dominant factor on the performance decline under the DEA operations. (C) 2013 Elsevier B.V. All rights reserved.