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Mixed proton and electron conducting double perovskite anodes for stable and efficient tubular proton ceramic electrolysers

Mixed proton and electron conducting double perovskite anodes for stable and efficient tubular proton ceramic electrolysers

Category
Journal publication
Abstract
Hydrogen production from water electrolysis is a key enabling energy storage technology for the large-scale deployment of intermittent renewable energy sources. Proton ceramic electrolysers (PCEs) can produce dry pressurized hydrogen directly from steam, avoiding major parts of cost-driving downstream separation and compression. However, the development of PCEs has suffered from limited electrical efficiency due to electronic leakage and poor electrode kinetics. Here, we present the first fully operational BaZrO3-based tubular PCE, with 10 cm2 active area and a hydrogen production rate above 15 Nml min−1. The novel steam anode Ba1−xGd0.8La0.2+xCo2O6−δ exhibits mixed p-type electronic and protonic conduction and low activation energy for water splitting, enabling total polarization resistances below 1 Ω cm2 at 600 °C and Faradaic efficiencies close to 100% at high steam pressures. These tubular PCEs are mechanically robust, tolerate high pressures, allow improved process integration and offer scale-up modularity.
Client
  • EC/FP7 / 621244
  • Norges forskningsråd / 236828
  • EC/H2020 / 779486
Language
English
Author(s)
Affiliation
  • University of Oslo
  • University of Oslo
  • SINTEF Industry / Sustainable Energy Technology
  • Spanish National Research Council
  • Polytechnic University of Valencia
  • Diverse norske bedrifter og organisasjoner
Year
2019
Published in
Nature Materials
ISSN
1476-1122
Volume
18
Issue
7
Page(s)
752 - 759