气候变化领域集成服务门户(CCPortal): Comprehensive investigation of novel pore-graded gas diffusion layers for high-performance and cost-effective proton exchange membrane electrolyzers

CCPortal

DOI	10.1039/c7ee01240c
	Comprehensive investigation of novel pore-graded gas diffusion layers for high-performance and cost-effective proton exchange membrane electrolyzers
	Lettenmeier P.; Kolb S.; Sata N.; Fallisch A.; Zielke L.; Thiele S.; Gago A.S.; Friedrich K.A.
发表日期	2017
ISSN	17545692
起始页码	2521
结束页码	2533
卷号	10 期号:12
英文摘要	Hydrogen produced by water electrolysis is a promising storage medium for renewable energy. Reducing the capital cost of proton exchange membrane (PEM) electrolyzers without losing efficiency is one of its most pressing challenges. Gas diffusion layers (GDL), such as felts, foams, meshes and sintered plates, are key stack components, but these are either inefficient or expensive. This study presents a new type of GDL produced via vacuum plasma spraying (VPS), which offers a large potential for cost reduction. With this technology, it is possible to introduce a gradient in the pore-size distribution along the thickness of the GDL by varying the plasma parameters and titanium powder particle sizes. This feature was confirmed by cross-section scanning electron microscopy (SEM). X-ray computed tomography (CT) and mercury intrusion porosimetry allowed determining the porosity, pore radii distribution, and pore entry distribution. Pore radii of ca. 10 μm could be achieved in the layers of the GDL close to the bipolar plate, while those in contact with the electrodes were in the range of 5 μm. The thermally sprayed Ti-GDLs allowed achieving PEM electrolyzer performances comparable to those of the state-of-the-art sintered plates and far superior than those of meshes. Moreover, a numerical model showed that the reduced capillary pressure and tortuosity eliminates mass transport limitations at 2 A cm-2. The results presented herein demonstrate a promising solution to reduce the cost of one of the most expensive components of the stack. © The Royal Society of Chemistry.
英文关键词	Computerized tomography; Cost effectiveness; Cost reduction; Costs; Diffusion in gases; Electrolytic cells; Hydrogen; Hydrogen storage; Mercury (metal); Plasma spraying; Pore size; Produced Water; Scanning electron microscopy; Sintering; Gas diffusion layers; Mass transport limitation; Mercury intrusion porosimetry; Proton exchange membrane electrolyzers; Renewable energies; Vacuum plasma spraying; Water electrolysis; X-ray computed tomography; Proton exchange membrane fuel cells (PEMFC); capillary pressure; cost analysis; diffusion; equipment; hydrogen; ion exchange; mass transport; membrane; parameterization; performance assessment; renewable resource; spray
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/190357
作者单位	Institute of Engineering Thermodynamics, German Aerospace Center, Pfaffenwaldring 38-40, Stuttgart, 70569, Germany; Fraunhofer-Institut für Solare Energiesysteme ISE, Heidenhofstrasse 2, Freiburg, 79110, Germany; Laboratory for MEMS Applications, IMTEK Department of Microsystems Engineering, University of Freiburg, Georges-Koehler-Allee 103, Freiburg, 79110, Germany; Hahn-Schickard, Wilhelm-Schickard-Straße 10, Villingen-Schwenningen, 78052, Germany; FIT, University of Freiburg, Georges-Koehler-Allee 105, Freiburg, 79110, Germany; Institute for Energy Storage, University of Stuttgart, Keplerstraße 7, Stuttgart, 70550, Germany
推荐引用方式 GB/T 7714	Lettenmeier P.,Kolb S.,Sata N.,et al. Comprehensive investigation of novel pore-graded gas diffusion layers for high-performance and cost-effective proton exchange membrane electrolyzers[J],2017,10(12).
APA	Lettenmeier P..,Kolb S..,Sata N..,Fallisch A..,Zielke L..,...&Friedrich K.A..(2017).Comprehensive investigation of novel pore-graded gas diffusion layers for high-performance and cost-effective proton exchange membrane electrolyzers.Energy & Environmental Science,10(12).
MLA	Lettenmeier P.,et al."Comprehensive investigation of novel pore-graded gas diffusion layers for high-performance and cost-effective proton exchange membrane electrolyzers".Energy & Environmental Science 10.12(2017).