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高性能燃料电池阴极的热膨胀补偿
作者:小柯机器人 发布时间:2021/3/14 19:29:00

南京工业大学邵宗平、周嵬团队描述了一种高性能燃料电池阴极的热膨胀补偿策略。 相关研究成果于2021年3月10日发表在《自然》。

固体氧化物燃料电池作为一种高效的能量转换装置,热机械不稳定性是其商业化发展面临的一个挑战。这种不稳定性是由于不同燃料电池组件之间热膨胀行为不匹配导致的较大内部应变梯度所致,这可能导致电池退化、分层或断裂1、2、3、4。

该文中,研究人员演示了一种通过引入热膨胀补偿来实现阴极和其他电池组件之间完全热机械兼容性的方法。利用反应烧结技术,将电化学活性高、热膨胀系数大的钴基钙钛矿与负热膨胀材料相结合,形成了一种热膨胀性能与电解液相匹配的复合电极。由于复合材料中两种材料在煅烧过程中反应有限,形成了新的界面相,这也造成了钙钛矿中的A位缺陷。结果表明,该复合材料具有较高的活性和良好的稳定性。

反应性负热膨胀元件的引入为固体氧化物燃料电池电极的研制提供了一个通用策略。

附:英文原文

Title: Thermal-expansion offset for high-performance fuel cell cathodes

Author: Yuan Zhang, Bin Chen, Daqin Guan, Meigui Xu, Ran Ran, Meng Ni, Wei Zhou, Ryan OHayre, Zongping Shao

Issue&Volume: 2021-03-10

Abstract: One challenge for the commercial development of solid oxide fuel cells as efficient energy-conversion devices is thermo-mechanical instability. Large internal-strain gradients caused by the mismatch in thermal expansion behaviour between different fuel cell components are the main cause of this instability, which can lead to cell degradation, delamination or fracture1,2,3,4. Here we demonstrate an approach to realizing full thermo-mechanical compatibility between the cathode and other cell components by introducing a thermal-expansion offset. We use reactive sintering to combine a cobalt-based perovskite with high electrochemical activity and large thermal-expansion coefficient with a negative-thermal-expansion material, thus forming a composite electrode with a thermal-expansion behaviour that is well matched to that of the electrolyte. A new interphase is formed because of the limited reaction between the two materials in the composite during the calcination process, which also creates A-site deficiencies in the perovskite. As a result, the composite shows both high activity and excellent stability. The introduction of reactive negative-thermal-expansion components may provide a general strategy for the development of fully compatible and highly active electrodes for solid oxide fuel cells.

DOI: 10.1038/s41586-021-03264-1

Source: https://www.nature.com/articles/s41586-021-03264-1

期刊信息

Nature:《自然》,创刊于1869年。隶属于施普林格·自然出版集团,最新IF:42.778
官方网址:http://www.nature.com/