Matthew P. Wells, Kosova Kreka, Mohana V. Kante, Miriam Botros, Ozden Celikbilek, Jan Pieter Ouweltjes, Federico Baiutti, Simon M. Fairclough, Caterina Ducati, Albert Tarancón, Judith L. MacManus-Driscoll
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引用次数: 0
Abstract
Solid oxide fuel cells (SOFCs) are widely presented as a sustainable solution to future energy challenges. Nevertheless, solid oxide fuel cells presently rely on significant use of several critical raw materials to enable optimized electrode reaction kinetics. This challenge can be addressed by using thin-film electrode materials; however, this is typically accompanied by complex device fabrication procedures as well as poor mechanical/chemical stability. In this work, we conduct a systematic study of a range of promising thin-film electrode materials based on vertically aligned nanocomposite (VAN) thin films. We demonstrate low area specific resistance (ASR) values of 0.44 cm2 at 650 °C can be achieved using (La0.60Sr0.40)0.95Co0.20Fe0.80O3-(Sm2O3)0.20(CeO2)0.80 (LSCF-SDC) thin films, which are also characterized by a low degradation rate, approximately half that of planar LSCF thin films. We then integrate these (La0.60Sr0.40)0.95Co0.20Fe0.80O3-(Sm2O3)0.20(CeO2)0.80 vertically aligned nanocomposite films directly with commercial anode supported half cells through a single-step deposition process. The resulting cells exhibit peak power density of 0.47 W cm−2 at 750 °C, competitive with 0.64 W cm−2 achieved for the same cells operating with a bulk (La0.60Sr0.40)0.95Co0.20Fe0.80O3 cathode, despite 99.5% reduction in cathode critical raw material use. By demonstrating such competitive performance using thin-film cathode functional layers, this work also paves the way for further cost reductions in solid oxide fuel cells, which could be achieved by likewise applying thin-film architectures to the anode functional layer and/or current collecting layers, which typically account for the greatest materials cost in solid oxide fuel cell stacks. Therefore, the present work marks a valuable step towards the sustainable proliferation of solid oxide fuel cells.
固体氧化物燃料电池（sofc）被广泛认为是解决未来能源挑战的可持续解决方案。然而，固体氧化物燃料电池目前依赖于几种关键原材料的大量使用，以实现优化的电极反应动力学。这一挑战可以通过使用薄膜电极材料来解决；然而，这通常伴随着复杂的设备制造程序以及较差的机械/化学稳定性。在这项工作中，我们对一系列基于垂直排列纳米复合材料（VAN）薄膜的有前途的薄膜电极材料进行了系统的研究。我们证明了使用（La0.60Sr0.40）0.95Co0.20Fe0.80O3-(Sm2O3)0.20(CeO2)0.80 （LSCF- sdc）薄膜可以在650°C下实现0.44 cm2的低面积比电阻（ASR），该薄膜的降解率也很低，约为平面LSCF薄膜的一半。然后，我们通过单步沉积工艺将这些（La0.60Sr0.40）0.95Co0.20Fe0.80O3-(Sm2O3)0.20(CeO2)0.80垂直排列的纳米复合膜直接集成到商用阳极支撑的半电池上。所得电池在750°C时的峰值功率密度为0.47 W cm−2，与使用大块（La0.60Sr0.40）0.95Co0.20Fe0.80O3阴极的相同电池所达到的0.64 W cm−2竞争，尽管阴极关键原材料的使用减少了99.5%。通过使用薄膜阴极功能层展示这种具有竞争力的性能，这项工作也为进一步降低固体氧化物燃料电池的成本铺平了道路，这可以通过同样将薄膜结构应用于阳极功能层和/或电流收集层来实现，这通常是固体氧化物燃料电池堆中最大的材料成本。因此，目前的工作标志着向固体氧化物燃料电池的可持续扩散迈出了宝贵的一步。
期刊介绍：
Energy & Environmental Materials (EEM) is an international journal published by Zhengzhou University in collaboration with John Wiley & Sons, Inc. The journal aims to publish high quality research related to materials for energy harvesting, conversion, storage, and transport, as well as for creating a cleaner environment. EEM welcomes research work of significant general interest that has a high impact on society-relevant technological advances. The scope of the journal is intentionally broad, recognizing the complexity of issues and challenges related to energy and environmental materials. Therefore, interdisciplinary work across basic science and engineering disciplines is particularly encouraged. The areas covered by the journal include, but are not limited to, materials and composites for photovoltaics and photoelectrochemistry, bioprocessing, batteries, fuel cells, supercapacitors, clean air, and devices with multifunctionality. The readership of the journal includes chemical, physical, biological, materials, and environmental scientists and engineers from academia, industry, and policy-making.
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