Interfacial analysis of a PEM electrolyzer using X-ray computed tomography

Leonard, Emily; Shum, Andrew D.; Danilovic, Nemanja; Capuano, Christopher; Ayers, Katherine E.; Pant, Lalit M.; Weber, Adam Z.; Xiao, Xianghui; Parkinson, Dilworth Y.; Zenyuk, Iryna V.

doi:10.1039/c9se00364a

Interfacial analysis of a PEM electrolyzer using X-ray computed tomography

Journal Article · Mon Dec 02 00:00:00 EST 2019 · Sustainable Energy & Fuels

DOI:https://doi.org/10.1039/c9se00364a· OSTI ID:1763359

Leonard, Emily ^[1]; Shum, Andrew D. ^[1]; Danilovic, Nemanja ^[2]; Capuano, Christopher ^[3]; ^[3]; Pant, Lalit M. ^[2]; ^[2]; Xiao, Xianghui ^[4]; Parkinson, Dilworth Y. ^[2]; ^[5]

Tufts Univ., Medford, MA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Nel Hydrogen, Wallingford, CT (United States)
Argonne National Lab. (ANL), Lemont, IL (United States); Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
Tufts Univ., Medford, MA (United States); Univ. of California, Irvine, CA (United States). National Fuel Cell Research Center

Polymer electrolyte membrane (PEM) electrolyzers are electrochemical energy-conversion devices that convert electricity into hydrogen fuel at high efficiencies. The interface between the porous transport layer (PTL) and catalyst layer is of interest from a transport perspective, as this interface is rough, reducing contact between the layers. Electrons, protons, water and oxygen have to simultaneously meet at this interface and there is a need to understand the optimal morphology. In this study we use operando X-ray computed tomography (CT) and X-ray radiography to visualize the operation of PEM electrolyzers under two current densities: 500 and 800 mA cm^-2. First, we compare the performance of catalyst-coated membrane (CCM) electrolyzers with porous transport electrode (PTE) electrolyzers by correlating polarization curves with interface morphology observed with X-ray CT. At 1 A cm^-2, the micro-CT CCM electrolyzer showed 200 mV improvement in potential primarily due to better contact between the electrocatalyst, membrane, and PTL. From the nano-CT imaging we discovered non-homogeneous distribution of an IrO_x electrocatalyst. The modeling study shows that the primary reason for performance loss in the PTE configuration is due to the low connectivity of catalyst particles with the membrane. This causes bottlenecks in proton transport and results in high ionic potential losses in the anode. Then, we compared the polarization behavior and morphology of cells with CCMs but two types of PTLs. Furthermore, one was made with sintered titanium and the other with titanium fiber. The Ti fiber PTL showed higher porosity and lower tortuosities, however these better morphological properties did not necessarily translate into significantly lower potentials (45 mV difference), as the electrolyzer was not operated above 1 A cm^-2. This was also confirmed by radiography study, where oxygen residence time in the channels showed similar fractions for both types of PTLs.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Proton Energy Systems, Inc., Wallingford, CT (United States)

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

Grant/Contract Number:: AC02-05CH11231; AC02-06CH11357; EE0008081; SC0012704

OSTI ID:: 1763359

Alternate ID(s):: OSTI ID: 1770763
OSTI ID: 1885537
OSTI ID: 1579387
OSTI ID: 1690078

Journal Information:: Sustainable Energy & Fuels, Journal Name: Sustainable Energy & Fuels Journal Issue: 2 Vol. 4; ISSN 2398-4902

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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