高温电化学电池工作量热计
An operando calorimeter for high temperature electrochemical cells
摘要：
操作量热法先前已用于研究在室温或接近室温下电化学电池（例如电池）中的降解、副反应和其它电化学效应。量热数据可以提供关于电化学电池的寿命和热性质的重要信息，并且可以用于实际工程应用，例如热管理。高温电化学电池如固体氧化物燃料电池或电解槽也可以受益于操作量热法，尽管据我们所知，还没有商业上开发出这样的单元。在此，我们报告了一种能够在高达1,000 °C的温度下在氧化和还原气氛中同时进行量热和电化学的操作量热计。量热计是通过修改一个商业装置，最初设计用于研究高温电化学电池在各种气体环境中。我们利用灰箱，非线性系统识别模型来分析量热数据，并实现了16.1 +/- 11.7 mW的电化学电池功率灵敏度。这种操作量热仪提供了研究高温下电化学电池的热和动力学行为所需的工具。
英文摘要：
Operando calorimetry has previously been utilized to study degradation, side reactions, and other electrochemical effects in electrochemical cells such as batteries at or near room temperature. Calorimetric data can provide important information on the lifetime and thermal properties of electrochemical cells and can be used in practical engineering applications such as thermal management. High temperature electrochemical cells such as solid oxide fuel cells or electrolyzers can also benefit from operando calorimetry, although to our knowledge no such unit has been developed commercially. Herein, we report an operando calorimeter capable of simultaneous calorimetry and electrochemistry at temperatures up to 1,000 °C and in both oxidizing and reducing atmospheres. The calorimeter is constructed by modifying a commercial apparatus originally designed to study high temperature electrochemical cells in various gas environments. We utilize a grey-box, nonlinear system identification model to analyze calorimetric data and achieve an electrochemical cell power sensitivity of 16.1 +/- 11.7 mW. This operando calorimeter provides the tools needed to study both the thermal and kinetic behavior of electrochemical cells at elevated temperatures.
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