Details

Autor(en) / Beteiligte

• Vøllestad, Einar
• Strandbakke, Ragnar
• Tarach, Mateusz
• Catalán-Martínez, David
• Fontaine, Marie-Laure
• Beeaff, Dustin
• Clark, Daniel R.
• Serra, Jose M.
• Norby, Truls

Titel

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

Ist Teil von

• Nature materials, 2019-07, Vol.18 (7), p.752-759

Ort / Verlag

London: Nature Publishing Group UK

Erscheinungsjahr

2019

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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 BaZrO 3 -based tubular PCE, with 10 cm 2 active area and a hydrogen production rate above 15 Nml min −1 . The novel steam anode Ba 1− x Gd 0.8 La 0.2+ x Co 2 O 6− δ exhibits mixed p-type electronic and protonic conduction and low activation energy for water splitting, enabling total polarization resistances below 1 Ω cm 2 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. Proton ceramic electrolysers can produce hydrogen directly from steam, but their development has suffered from limited electrical efficiency. A fully operational and stable BaZrO 3 -based tubular electrolyser with high hydrogen production rate is now reported.