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This content will become publicly available on June 21, 2019

Title: Developing titanium micro/nano porous layers on planar thin/tunable LGDLs for high-efficiency hydrogen production

Proton exchange membrane electrolyzer cells (PEMECs) have been considered one of the most promising devices for hydrogen generation and energy storage from water splitting, especially when coupled with sustainable energy resources. Microporous layers (MPLs), which have been widely used in fuel cells for better catalyst access and product/reactant removal, have limited investigations in PEMECs due to harsh environments and carbon corrosion. In this study, the MPLs with both irregular micro (~5 um) and spherical nano (30-50 nm) titanium particles are developed on novel thin/tunable liquid/gas diffusion layers (TT-LGDLs) and are investigated comprehensively both in-situ and ex-situ for the first time. The MPLs change the wettability of the TT-LGDLs and show super hydrophobic property. The results reveal that micro particle MPLs exhibit improved catalytic activity but increased ohmic resistances, and that nano particle MPLs do not impact catalytic activity meaningfully but exhibit even greater increases in ohmic resistance. The effects of the thickness of the MPLs are also investigated and the typical MPL is also studied by in-situ visualization in a transparent PEMEC with a high-speed and micro-scale visualization system (HMVS). The results indicate the strong feasibility of the TT-LGDLs with small pore size and large porosity for high-efficiency and low-costmore » PEMEC practical applications.« less
Authors:
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Publication Date:
Report Number(s):
NREL/JA-5900-71854
Journal ID: ISSN 0360-3199
Grant/Contract Number:
AC36-08GO28308; AC05-00OR22725; FE0011585
Type:
Accepted Manuscript
Journal Name:
International Journal of Hydrogen Energy
Additional Journal Information:
Journal Volume: none; Journal Issue: none; Journal ID: ISSN 0360-3199
Publisher:
Elsevier
Research Org:
National Renewable Energy Lab. (NREL), Golden, CO (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee Space Inst. (UTSI), Tullahoma, TN (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE Office of Fossil Energy (FE); USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
08 HYDROGEN; microporous layer; hydrogen energy; activation; liquid/gas diffusion layers; proton exchange membrane electrolyzer cells; water splitting
OSTI Identifier:
1462842
Alternate Identifier(s):
OSTI ID: 1458820