Exploring the Impacts of Conditioning on Proton Exchange Membrane Electrolyzers by In Situ Visualization and Electrochemistry Characterization

Wang, Weitian; Li, Kui; Ding, Lei; Yu, Shule; Xie, Zhiqiang; Cullen, David A.; Yu, Haoran; Bender, Guido; Kang, Zhenye; Wrubel, Jacob A.; Ma, Zhiwen; Capuano, Christopher B.; Keane, Alex; Ayers, Kathy; Zhang, Feng-Yuan

doi:10.1021/acsami.1c21849

Title: Exploring the Impacts of Conditioning on Proton Exchange Membrane Electrolyzers by In Situ Visualization and Electrochemistry Characterization

Journal Article · 10 February 2022 · ACS Applied Materials and Interfaces

DOI: https://doi.org/10.1021/acsami.1c21849 · OSTI ID:1846939

^[1];

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

^[2]; Yu, Haoran ^[2]; Bender, Guido ^[3]; Kang, Zhenye ^[3]; Wrubel, Jacob A. ^[3];

^[3]; Capuano, Christopher B. ^[4]; Keane, Alex ^[4]; Ayers, Kathy ^[4];

^[1]

Univ. of Tennessee, Knoxville, Tullahoma, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Nel Hydrogen, Wallingford, CT (United States)

For a proton exchange membrane electrolyzer cell (PEMEC), conditioning is an essential process to enhance its performance, reproducibility, and economic efficiency. To get more insights into conditioning, a PEMEC with Ir-coated gas diffusion electrode (IrGDE) was investigated by electrochemistry and in situ visualization characterization techniques. The changes of polarization curves, electrochemical impedance spectra (EIS), and bubble dynamics before and after conditioning are analyzed. The polarization curves show that the cell efficiency increased by 9.15% at 0.4 A/cm², and the EIS and Tafel slope results indicate that both the ohmic and activation overpotential losses decrease after conditioning. The visualization of bubble formation unveils that the number of bubble sites increased greatly from 14 to 29 per pore after conditioning, at the same voltage of 1.6 V. Under the same current density of 0.2 A/cm²; the average bubble detachment size decreased obviously from 35 to 25 µm. Furthermore, the electrochemistry and visualization characterization results jointly unveiled the increase of reaction sites and the surface oxidation on the IrGDE during conditioning, which provides more insights into the conditioning and benefits for the future GDE design and optimization.

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Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office

Grant/Contract Number:: AC36-08GO28308; AC05-00OR22725; EE0008426; EE0008423

OSTI ID:: 1846939

Report Number(s):: NREL/JA-5900-81876; MainId:82649; UUID:3f4d1cfd-dc06-46a3-9879-1d1f01d30b5a; MainAdminID:63929

Journal Information:: ACS Applied Materials and Interfaces, Journal Name: ACS Applied Materials and Interfaces Journal Issue: 7 Vol. 14; ISSN 1944-8244

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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08 HYDROGEN
30 DIRECT ENERGY CONVERSION
EIS
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bubble dynamics
bubbles
catalysts
conditioning
electrical properties
electrochemical cells
electrochemical impedance spectra
electrodes
green hydrogen
proton exchange membrane electrolyzer cell
visualization

Title: Exploring the Impacts of Conditioning on Proton Exchange Membrane Electrolyzers by In Situ Visualization and Electrochemistry Characterization

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