Exploring the Interface of Skin-Layered Titanium Fibers for Electrochemical Water Splitting

Chang Liu, Meital Shviro, Aldo S. Gago, Sarah F. Zaccarine, Guido Bender, Pawel Gazdzicki, Tobias Morawietz, Indro Biswas, Marcin Rasinski, Andreas Everwand, Roland Schierholz, Jason Pfeilsticker, Martin Müller, Pietro P. Lopes, Rüdiger A. Eichel, Bryan Pivovar, Svitlana Pylypenko, K. Andreas Friedrich, Werner Lehnert, Marcelo Carmo

Research output: Contribution to journalArticlepeer-review

63 Scopus Citations

Abstract

Water electrolysis is the key to a decarbonized energy system, as it enables the conversion and storage of renewably generated intermittent electricity in the form of hydrogen. However, reliability challenges arising from titanium-based porous transport layers (PTLs) have hitherto restricted the deployment of next-generation water-splitting devices. Here, it is shown for the first time how PTLs can be adapted so that their interface remains well protected and resistant to corrosion across ≈4000 h under real electrolysis conditions. It is also demonstrated that the malfunctioning of unprotected PTLs is a result triggered by additional fatal degradation mechanisms over the anodic catalyst layer beyond the impacts expected from iridium oxide stability. Now, superior durability and efficiency in water electrolyzers can be achieved over extended periods of operation with less-expensive PTLs with proper protection, which can be explained by the detailed reconstruction of the interface between the different elements, materials, layers, and components presented in this work.

Original languageAmerican English
Article number2002926
Number of pages10
JournalAdvanced Energy Materials
Volume11
Issue number8
DOIs
StatePublished - 2021

Bibliographical note

Publisher Copyright:
© 2021 The Authors. Advanced Energy Materials published by Wiley-VCH GmbH

NREL Publication Number

  • NREL/JA-5900-77300

Keywords

  • degradation
  • durability
  • iridium
  • PEM water electrolysis
  • porous transport layers

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