期刊
ELECTROCHIMICA ACTA
卷 211, 期 -, 页码 478-487出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2016.06.068
关键词
Gas diffusion layer; air-cooled open-cathode; X-ray computed tomography; neutron imaging; water management
资金
- EPSRC [EP/M009394/1, EP/G030995/1, EP/I037024/1, EP/M014371/1, EP/M023508/1]
- ELEVATE project
- RAEng
- European Community
- European Research Infrastructure H2FC (under the FP7 specific programme Capacities) [284522]
- Engineering and Physical Sciences Research Council [EP/I037024/1, EP/G030995/1, 1507516, EP/M009394/1, EP/M014371/1, EP/M023508/1] Funding Source: researchfish
- Science and Technology Facilities Council [ST/K00171X/1, ST/N002385/1] Funding Source: researchfish
- EPSRC [EP/G030995/1, EP/I037024/1, EP/M009394/1, EP/M014371/1, EP/M023508/1] Funding Source: UKRI
- STFC [ST/N002385/1, ST/K00171X/1] Funding Source: UKRI
In-operando diagnostic techniques provide a means of understanding the internal workings of fuel cells under normal operating conditions so that improved designs and operating regimes can be identified. Here, an approach is used which combines ex-situ characterisation of two anode gas diffusion/microporous layers (GDL-A and GDL-B) with X-ray computed tomography (CT) and in-operando analysis using neutron imaging of operating fuel cells. The combination of TGA, SEM and X-ray CT reveals that GDL-A has a thin microporous layer with similar to 26% PTFE covering a thick diffusion layer composed of 'spaghetti'-shaped fibres. GDL-B is covered by two microporous media (29% and 6.6% PTFE) penetrating deep within the linear fibre network. The neutron imaging reveals two pathways for water transport underneath the cooling channel, either diffusing through the cathode GDL to the active channels, or diffusing through the membrane and towards the anode. The behaviour of water in the GDL is directly affected by the anode gas diffusion, PTFE content and porosity. (C) 2016 Elsevier Ltd. All rights reserved.
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