Investigation of thin/well-tunable liquid/gas diffusion layers exhibiting superior multifunctional performance in low-temperature electrolytic water splitting

Kang, Zhenye; Mo, Jingke; Yang, Gaoqiang; Retterer, Scott T.; Cullen, David A.; Toops, Todd J.; Green, Jr, Johney B.; Mench, Matthew M.; Zhang, Feng-Yuan

doi:10.1039/C6EE02368A

Title: Investigation of thin/well-tunable liquid/gas diffusion layers exhibiting superior multifunctional performance in low-temperature electrolytic water splitting

Journal Article · Tue Oct 11 00:00:00 EDT 2016 · Energy & Environmental Science

DOI:https://doi.org/10.1039/C6EE02368A· OSTI ID:1354648

Kang, Zhenye ^[1]; Mo, Jingke ^[1]; Yang, Gaoqiang ^[1]; Retterer, Scott T. ^[2]; Cullen, David A. ^[2]; Toops, Todd J. ^[2]; Green, Jr, Johney B. ^[2]; Mench, Matthew M. ^[1]; Zhang, Feng-Yuan ^[1]

Univ. of Tennessee Space Inst. (UTSI), Knoxville, TN (United States). Dept. of Mechanical, Aerospace & Biomedical Engineering
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Liquid/gas diffusion layers (LGDLs), which are located between the catalyst layer (CL) and bipolar plate (BP), play an important role in enhancing the performance of water splitting in proton exchange membrane electrolyzer cells (PEMECs). They are expected to transport electrons, heat, and reactants/products simultaneously with minimum voltage, current, thermal, interfacial, and fluidic losses. Here in this study, the thin titanium-based LGDLs with straight-through pores and well-defined pore morphologies are comprehensively investigated for the first time. The novel LGDL with a 400 μm pore size and 0.7 porosity achieved a best-ever performance of 1.66 V at 2 A cm^-2 and 80 °C, as compared to the published literature. The thin/well-tunable titanium based LGDLs remarkably reduce ohmic and activation losses, and it was found that porosity has a more significant impact on performance than pore size. In addition, an appropriate equivalent electrical circuit model has been established to quantify the effects of pore morphologies. The rapid electrochemical reaction phenomena at the center of the PEMEC are observed by coupling with high-speed and micro-scale visualization systems. Lastly, the observed reactions contribute reasonable and pioneering data that elucidate the effects of porosity and pore size on the PEMEC performance. This study can be a new guide for future research and development towards high-efficiency and low-cost hydrogen energy.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Fuels, Engines and Emissions Research Center (FEERC); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). National Transportation Research Center (NTRC); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Manufacturing Demonstration Facility (MDF)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1354648

Journal Information:: Energy & Environmental Science, Vol. 10, Issue 1; ISSN 1754-5692

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 129 works

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