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Tuning Stainless Steel Oxide Layers through Potential Cycling─AEM Water Electrolysis Free of Critical Raw Materials.
Ferriday, Thomas Benjamin; Nuggehalli Sampathkumar, Suhas; Mensi, Mounir Driss; Middleton, Peter Hugh; Van Herle, Jan; Kolhe, Mohan Lal.
Afiliación
  • Ferriday TB; Department of Engineering, University of Agder, Jon Lilletuns vei 9, Grimstad, 4879 Agder, Norway.
  • Nuggehalli Sampathkumar S; Group of Energy Materials, Swiss Federal Institute of Technology, Lausanne, Rue de l'Industrie 17, Sion, 1951 Valais, Switzerland.
  • Mensi MD; Department of Engineering, University of Agder, Jon Lilletuns vei 9, Grimstad, 4879 Agder, Norway.
  • Middleton PH; Group of Energy Materials, Swiss Federal Institute of Technology, Lausanne, Rue de l'Industrie 17, Sion, 1951 Valais, Switzerland.
  • Van Herle J; X-Ray Diffraction and Surface Analytics Facility, Swiss Federal Institute of Technology, Lausanne, Rue de l'Industrie 17, Sion, 1951 Valais, Switzerland.
  • Kolhe ML; Department of Engineering, University of Agder, Jon Lilletuns vei 9, Grimstad, 4879 Agder, Norway.
ACS Appl Mater Interfaces ; 16(23): 29963-29978, 2024 Jun 12.
Article en En | MEDLINE | ID: mdl-38809814
ABSTRACT
Anion exchange membrane water electrolyzers (AEMWEs) have an intrinsic advantage over acidic proton exchange membrane water electrolyzers through their ability to use inexpensive, stable materials such as stainless steel (SS) to catalyze the sluggish oxygen evolution reaction (OER). As such, the study of active oxide layers on SS has garnered great interest. Potential cycling is a means to create such active oxide layers in situ as they are readily formed in alkaline solutions when exposed to elevated potentials. Cycling conditions in the literature are rife with unexplained variations, and a complete account of how these variations affect the activity and constitution of SS oxide layers remains unreported, along with their influence on AEMWE performance. In this paper, we seek to fill this gap in the literature by strategically cycling SS felt (SSF) electrodes under different scan rates and ranges. The SSF anodes were rapidly activated within the first 50 cycles, as shown by the 10-fold decline in charge transfer resistance, and the subsequent 1000 cycles tuned the metal oxide surface composition. Cycling the Ni redox couple (RC) increases Ni content, which is further enhanced by lowering the cycling rate, while cycling the Fe RC increases Cr content. Fair OER activity was uncovered through cycling the Ni RC, while Fe cycling produced SSF electrodes active toward both the OER and the hydrogen evolution reaction (HER). This indicates that inert SSF electrodes can be activated to become efficient OER and HER electrodes. To this effect, a single-cell AEMWE without any traditional catalyst or ionomer generated 1.0 A cm-2 at 1.94 V ± 13.3 mV with an SSF anode, showing a fair performance for a cell free of critical raw materials.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: ACS Appl Mater Interfaces Asunto de la revista: BIOTECNOLOGIA / ENGENHARIA BIOMEDICA Año: 2024 Tipo del documento: Article País de afiliación: Noruega Pais de publicación: Estados Unidos
Texto completo
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XML
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: ACS Appl Mater Interfaces Asunto de la revista: BIOTECNOLOGIA / ENGENHARIA BIOMEDICA Año: 2024 Tipo del documento: Article País de afiliación: Noruega Pais de publicación: Estados Unidos