Operando calorimetry has previously been utilized to study electrochemical reactions and degradation in electrochemical cells such as batteries. Calorimetric data can provide important information on the lifetime and thermal properties of electrochemical cells 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, but to the authors’ knowledge such capabilities have not been commercially developed. Herein, an operando calorimeter is reported that is capable of simultaneous calorimetry and electrochemistry at temperatures up to 1000 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. A grey-box, nonlinear system identification model is utilized to analyze both electrochemical and calorimetric data of BaZr_0.8Ce_0.1Y_0.1O₃ based electrochemical cells and achieve a calorimeter electrochemical cell power sensitivity of 16.1 11.7 mW. This operando calorimeter provides the capability to study thermal behaviour of electrochemical cells at elevated temperatures.

操作量热法先前已被用于研究电化学电池（如电池）中的电化学反应和降解。量热数据可以提供有关电化学电池在热管理等实际工程应用中的寿命和热特性的重要信息。高温电化学电池，如固体氧化物燃料电池或电解槽，也可以从操作量热法中受益，但据作者所知，这种能力还没有商业开发。在此，一个操作据报道，量热计能够在高达 1000 C 的温度下以及在氧化和还原气氛中同时进行量热和电化学。该量热计是通过修改最初设计用于研究各种气体环境中的高温电化学电池的商业设备来构建的。利用灰盒非线性系统识别模型分析基于 BaZr _0.8 Ce _0.1 Y _0.1 O ₃的电化学电池的电化学和量热数据，并实现了 16.1 11.7 mW 的量热计电化学电池功率灵敏度。该操作量热计提供了研究电化学电池在高温下的热行为的能力。