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Highly Active Nanostructured Electrodes for High Temperature, Degradation-Resistant Solid Oxide Reversible Cells

用于高温、抗降解固体氧化物可逆电池的高活性纳米结构电极

基本信息

批准号：
1604008
负责人：
Anil Virkar
金额：
$ 30.21万
依托单位：
University of Utah
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2016
资助国家：
美国
起止时间：
2016-06-01 至 2021-05-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1604008&HistoricalAwards=false
关键词：
Highly Active Nanostructured Electrodes Temperature

项目摘要

CBET - 1604008 PI: Virkar, Anil V. The proposed work deals with the stabilization of oxygen (i.e. air) electrodes for high-temperature solid oxide electrolysis cells (SOECs), which are used primarily for converting water to hydrogen. Such devices could be a key component of a sustainable energy and chemicals future based on wind or solar energy. The project will focus on synthesis of nanoparticle materials that have potential to improve the efficiency and stability of SOECs. The proposed work addresses a fundamental stability problem in solid oxide electrochemical cells that is shared among a number of devices including solid oxide fuels cells operating in the reversible mode and certain batteries. Thus, findings that will come out of the study can potentially benefit energy storage and conversion devices more broadly than SOECs alone.SOECs typically operate at high electrode overpotentials, which in turn, can result in build up of effective oxygen pressure at the electrode-electrolyte interface, in some cases to the point of bubble formation. The oxygen build-up can lead to internal cracking and electrode delamination. Thi project is based on the proposition that nanostructured electrodes consisting of ionically-conducting particles electrode and electrolyte materials can substantially lower polarization resistance, lower oxygen pressure (and the risk of bubble formation), and thereby suppress degradation. To this end, nanostructured perovskite oxygen electrodes in the range of 10-50 nm will be deposited on electrolyte discs and fuel electrode supported cells by a variety of techniques, and then characterized for polarization resistance using electrochemical impedance spectroscopy. The measured polarization resistance will be used in combination with microstructural analysis and calculations to predict degradation behavior that will be compared with experimental studies.

CBET - 1604008主要研究者：Virkar，Anil V. 拟议的工作涉及高温固体氧化物电解电池（SOEC）的氧（即空气）电极的稳定性，该电池主要用于将水转化为氢。这种装置可以成为基于风能或太阳能的可持续能源和化学品未来的关键组成部分。该项目将专注于合成有潜力提高SOEC效率和稳定性的纳米颗粒材料。所提出的工作解决了固体氧化物电化学电池中的基本稳定性问题，该问题在包括以可逆模式操作的固体氧化物燃料电池和某些电池的许多设备之间共享。因此，将从研究中得出的发现可以潜在地使能量存储和转换装置比单独的SOEC更广泛地受益A0 EC通常在高电极过电位下操作，这反过来可以导致在电极-电解质界面处建立有效氧压力，在某些情况下达到气泡形成的点。氧的积累可导致内部开裂和电极分层。该项目是基于这样的命题，即由离子导电颗粒电极和电解质材料组成的纳米结构电极可以显著降低极化电阻，降低氧气压力（和气泡形成的风险），从而抑制降解。为此，将通过各种技术将10-50 nm范围内的纳米结构钙钛矿氧电极沉积在电解质盘和燃料电极支撑的电池上，然后使用电化学阻抗谱表征极化电阻。测量的极化电阻将与微观结构分析和计算结合使用，以预测将与实验研究进行比较的降解行为。