Vøllestad Einar, Strandbakke Ragnar, Tarach Mateusz, Catalán-Martínez David, Fontaine Marie-Laure, Beeaff Dustin, Clark Daniel R, Serra Jose M, Norby Truls
Department of Chemistry, Centre for Materials Science and Nanotechnology (SMN), University of Oslo , Oslo, Norway.
SINTEF Industry, Sustainable Energy Technology, Oslo, Norway.
Nat Mater. 2019 Jul;18(7):752-759. doi: 10.1038/s41563-019-0388-2. Epub 2019 Jun 3.
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-based tubular PCE, with 10 cm active area and a hydrogen production rate above 15 Nml min. The novel steam anode BaGdLaCoO exhibits mixed p-type electronic and protonic conduction and low activation energy for water splitting, enabling total polarization resistances below 1 Ω cm 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.
通过水电解制氢是间歇性可再生能源大规模部署的一项关键储能技术。质子陶瓷电解槽（PCE）可直接从蒸汽中生产干燥的加压氢气，避免了成本高昂的下游分离和压缩的主要环节。然而，由于电子泄漏和电极动力学不佳，PCE的发展一直受到电效率有限的困扰。在此，我们展示了首个全功能的基于BaZrO的管状PCE，其有效面积为10平方厘米，产氢速率超过15 Nml/min。新型蒸汽阳极BaGdLaCoO表现出p型电子和质子混合传导以及较低的水分解活化能，在600°C时总极化电阻低于1Ω·cm，在高蒸汽压力下法拉第效率接近100%。这些管状PCE机械性能坚固，能承受高压，有利于改进工艺集成，并提供扩大规模的模块化方案。
