Ionomer-free nanoporous iridium nanosheet electrodes with boosted performance and catalyst utilization for high-efficiency water electrolyzers

Xie, Zhiqiang; Ding, Lei; Yu, Shule; Wang, Weitian; Capuano, Christopher B.; Keane, Alex; Ayers, Kathy; Cullen, David A.; Meyer, Harry M.; Zhang, Feng-Yuan

doi:10.1016/j.apcatb.2023.123298

Title: Ionomer-free nanoporous iridium nanosheet electrodes with boosted performance and catalyst utilization for high-efficiency water electrolyzers

Journal Article · 16 September 2023 · Applied Catalysis. B, Environmental

DOI: https://doi.org/10.1016/j.apcatb.2023.123298 · OSTI ID:2281118

Xie, Zhiqiang ^[1]; Ding, Lei ^[1]; Yu, Shule ^[1];

^[1]; Capuano, Christopher B. ^[2]; Keane, Alex ^[2];

^[2];

^[3];

^[4]; Zhang, Feng-Yuan ^[1]

Univ. of Tennessee Space Inst. (UTSI), Tullahoma, TN (United States)
Nel Hydrogen, Wallingford, CT (United States)
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)

Increasing the catalyst utilization efficiency and simplifying electrode fabrication processes are crucial to accelerate development of low-cost proton exchange membrane electrolyzer cells (PEMECs). Here, we develop a facile route to fabricate ionomer-free iridium nanosheet integrated electrodes, in which nanoporous iridium nanosheets (IrNS) with abundant exposed edges and nanopores are deposited on thin titanium liquid/gas diffusion layers (TT-LGDLs) via a low-temperature chemical synthesis strategy. Further, benefiting from high catalytic activity, good electrode conductivity and excellent liquid/gas transport properties, such nanoporous IrNS electrodes with low catalyst loadings require low cell voltages of 1.65 V and 1.78 V at 3000 and 6000 mA/cm², respectively. More impressively, a stable performance can be well maintained under extremely high current density tests of 5000 mA/cm², demonstrating the potential of low-loading nanoporous IrNS electrodes in solid-electrolyte based electrochemical conversion cells that require high current density operation.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS); National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Hydrogen Fuel Cell Technologies Office (HFTO)

Grant/Contract Number:: AC05-00OR22725; EE0008426; EE0008423; FE0011585

OSTI ID:: 2281118

Journal Information:: Applied Catalysis. B, Environmental, Vol. 341; ISSN 0926-3373

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Green hydrogen production
Nanoporous iridium nanosheets
Thin titanium liquid/gas diffusion layers
Low catalyst loading
PEM water electrolysis

Title: Ionomer-free nanoporous iridium nanosheet electrodes with boosted performance and catalyst utilization for high-efficiency water electrolyzers

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