Discovery of true electrochemical reactions for ultrahigh catalyst mass activity in water splitting

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

doi:10.1126/sciadv.1600690

Title: Discovery of true electrochemical reactions for ultrahigh catalyst mass activity in water splitting

Journal Article · Thu Nov 17 23:00:00 EST 2016 · Science Advances

DOI: https://doi.org/10.1126/sciadv.1600690 · OSTI ID:1334398

Mo, Jingke ^[1]; Kang, Zhenye ^[2]; Retterer, Scott T. ^[3]; Cullen, David A. ^[3]; Toops, Todd J. ^[3]; Green, Johney B. ^[4]; Mench, Matthew M. ^[5]; Zhang, Feng-Yuan ^[2]

Univ. of Tennessee, Knoxville, TN (United States). Space Inst., Dept. of Mechanical, Aerospace, and Biomedical Engineering
Univ. of Tennessee, Knoxville, TN (United States). Space Inst., Dept. of Mechanical, Aerospace, and Biomedical Engineering.
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Univ. of Tennessee, Knoxville, TN (United States). Dept. of Mechanical, Aerospace, and Biomedical Engineering.

Better understanding of true electrochemical reaction behaviors in electrochemical energy devices has long been desired. It has been assumed so far that the reactions occur across the entire catalyst layer (CL), which is designed and fabricated uniformly with catalysts, conductors of protons and electrons, and pathways for reactants and products. By introducing a state-of-the-art characterization system, a thin, highly tunable liquid/gas diffusion layer (LGDL), and an innovative design of electrochemical proton exchange membrane electrolyzer cells (PEMECs), the electrochemical reactions on both microspatial and microtemporal scales are revealed for the first time. Surprisingly, reactions occur only on the CL adjacent to good electrical conductors. On the basis of these findings, new CL fabrications on the novel LGDLs exhibit more than 50 times higher mass activity than conventional catalyst-coated membranes in PEMECs. In conclusion, this discovery presents an opportunity to enhance the multiphase interfacial effects, maximizing the use of the catalysts and significantly reducing the cost of these devices.

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Research Organization:: NREL (National Renewable Energy Laboratory (NREL), Golden, CO (United States))

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: AC36-08GO28308; FE0011585

OSTI ID:: 1334398

Report Number(s):: NREL/JA--4A00-67493

Journal Information:: Science Advances, Journal Name: Science Advances Journal Issue: 11 Vol. 2; ISSN 2375-2548

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Discovery of true electrochemical reactions for ultrahigh catalyst mass activity in water splitting

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