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引用次数: 0
摘要
人们对探索用于固体氧化物电解池(SOEC)蒸汽电解的非镍阴极材料以实现高法拉第效率的绿色制氢越来越感兴趣。铁基陶瓷材料因其可观的混合离子电子导电性而在这方面备受关注。本研究旨在探索一种用于对称 SOEC 的铁氧体基混合离子电子导体电极,这种电极可大大简化制造工艺。研究了一种银(Ag)和 A 位缺陷镧锶钴铁氧体((La0.60Sr0.40)0.95Co0.20Fe0.80O3-x)的复合材料,用于在钇稳定氧化锆电解质支撑的对称管状固体氧化物电池中进行蒸汽电解。在 1.5 V 和 800 °C 的氦-蒸汽气氛(50% 加湿)中,获得了 250 mA cm-2 的相当大的电流密度,相应的极化电阻低至 0.15 Ω-cm2。极化电阻与文献中报道的一些用于蒸汽电解的电极相当。不过,在 1.5 V 和 800 °C 的氦-蒸汽气氛(50% 加湿)中进行电解的头 20 小时,电流密度下降了 10%,但在接下来的 46 小时连续运行中,电流密度没有进一步下降。
Performance of Ferrite-Based Electrodes for Steam Electrolysis in Symmetrical Solid Oxide Cells
There is an increasing interest in the exploration of non-Nickel cathode materials for steam electrolysis in solid oxide electrolysis cells (SOEC) for green hydrogen production with high Faradaic efficiencies. Ferrite-based ceramic materials have drawn a lot of attention in this regard due to their appreciable mixed ionic electronic conductivity. This work aims to explore a ferrite-based mixed ionic electronic conductor electrode for symmetrical SOEC that can contribute significantly to simplifying the manufacturing processes. A composite of silver (Ag) and A-site deficient lanthanum strontium cobalt ferrite ((La0.60Sr0.40)0.95Co0.20Fe0.80O3-x), is studied for steam electrolysis in a yttria stabilized zirconia electrolyte-supported symmetrical tubular solid oxide cell. A considerable current density of 250 mA cm−2 is obtained at 1.5 V and 800 °C in a Helium-Steam atmosphere (50% humidified) with a corresponding polarization resistance as low as 0.15 Ω-cm2. The polarization resistance is comparable to a number of electrodes reported in the literature for steam electrolysis. However, a 10% drop in current density is observed during the first 20 h of electrolysis at 1.5 V and 800 °C in a Helium-Steam atmosphere (50% humidified), but no further drop is encountered during the next 46 h of continuous operation.
期刊介绍:
Advanced Materials Interfaces publishes top-level research on interface technologies and effects. Considering any interface formed between solids, liquids, and gases, the journal ensures an interdisciplinary blend of physics, chemistry, materials science, and life sciences. Advanced Materials Interfaces was launched in 2014 and received an Impact Factor of 4.834 in 2018.
The scope of Advanced Materials Interfaces is dedicated to interfaces and surfaces that play an essential role in virtually all materials and devices. Physics, chemistry, materials science and life sciences blend to encourage new, cross-pollinating ideas, which will drive forward our understanding of the processes at the interface.
Advanced Materials Interfaces covers all topics in interface-related research:
Oil / water separation,
Applications of nanostructured materials,
2D materials and heterostructures,
Surfaces and interfaces in organic electronic devices,
Catalysis and membranes,
Self-assembly and nanopatterned surfaces,
Composite and coating materials,
Biointerfaces for technical and medical applications.
Advanced Materials Interfaces provides a forum for topics on surface and interface science with a wide choice of formats: Reviews, Full Papers, and Communications, as well as Progress Reports and Research News.