Journal
NATURE MATERIALS
Volume 18, Issue 7, Pages 752-+Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41563-019-0388-2
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Funding
- Research Council of Norway [236828]
- European Union [621244, 779486]
- European Union's Horizon 2020 research and innovation programme
- Hydrogen Europe
- Hydrogen Europe research
- H2020 Societal Challenges Programme [779486] Funding Source: H2020 Societal Challenges Programme
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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 cm(2) active area and a hydrogen production rate above 15 Nml min(-1). The novel steam anode Ba1-xGd0.8La0.2+xCo2O6-delta exhibits mixed p-type electronic and protonic conduction and low activation energy for water splitting, enabling total polarization resistances below 1 Omega cm(2) at 600 degrees 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.
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